GET https://kbin.spritesserver.nl/m/askelectronics@discuss.tchncs.de/t/749/Can-I-switch-this-constant-current-LED-driver-at-38kHz/comment/7512/votes/down

Response
200 OK
IP
216.73.216.122
Profiled on
Token
8c947c

Security

Token

There is no security token.

Firewall

main Name
Security enabled
Stateless

Configuration

Key Value
provider security.user.provider.concrete.app_user_provider
context main
entry_point App\Security\KbinAuthenticator
user_checker App\Security\UserChecker
access_denied_handler (none)
access_denied_url (none)
authenticators 
[
  "two_factor"
  "remember_me"
  "App\Security\KbinAuthenticator"
  "App\Security\FacebookAuthenticator"
  "App\Security\GoogleAuthenticator"
  "App\Security\GithubAuthenticator"
  "App\Security\KeycloakAuthenticator"
]

Listeners

Listener Duration Response 
Symfony\Component\Security\Http\Firewall\ChannelListener {#723
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
  -logger: Monolog\Logger {#783 …}
  -httpPort: 80
  -httpsPort: 443
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\ContextListener {#706
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage {#1017 …}
  -sessionKey: "_security_main"
  -logger: Monolog\Logger {#783 …}
  -userProviders: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#705 …}
  -dispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
  -registered: false
  -trustResolver: Scheb\TwoFactorBundle\Security\Authentication\AuthenticationTrustResolver {#780 …}
  -sessionTrackerEnabler: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage::enableUsageTracking(): void {#703 …}
}
 21.46 ms (none) 
Symfony\Component\Security\Http\Firewall\AuthenticatorManagerListener {#584
  -authenticatorManager: Symfony\Component\Security\Http\Authentication\AuthenticatorManager {#595 …}
}
 0.00 ms (none) 
Scheb\TwoFactorBundle\Security\Http\Firewall\TwoFactorAccessListener {#582
  -twoFactorFirewallConfig: Scheb\TwoFactorBundle\Security\TwoFactor\TwoFactorFirewallConfig {#842 …}
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -twoFactorAccessDecider: Scheb\TwoFactorBundle\Security\Authorization\TwoFactorAccessDecider {#581 …}
}
 0.06 ms (none) 
Symfony\Component\Security\Http\Firewall\AccessListener {#579
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -accessDecisionManager: Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager {#937 …}
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\LogoutListener {#786
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -options: [
    "csrf_parameter" => "_csrf_token"
    "csrf_token_id" => "logout"
    "logout_path" => "app_logout"
  ]
  -httpUtils: Symfony\Component\Security\Http\HttpUtils {#841 …}
  -csrfTokenManager: Symfony\Component\Security\Csrf\CsrfTokenManager {#1015 …}
  -eventDispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
}
 0.00 ms (none)

Authenticators

No authenticators have been recorded. Check previous profiles on your authentication endpoint.

Access Decision

affirmative Strategy
# Voter class
1 
"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
2 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
3 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
4 
"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
5 
"App\Security\Voter\EntryCommentVoter"
6 
"App\Security\Voter\EntryVoter"
7 
"App\Security\Voter\MagazineVoter"
8 
"App\Security\Voter\MessageThreadVoter"
9 
"App\Security\Voter\MessageVoter"
10 
"App\Security\Voter\NotificationVoter"
11 
"App\Security\Voter\OAuth2UserConsentVoter"
12 
"App\Security\Voter\PostCommentVoter"
13 
"App\Security\Voter\PostVoter"
14 
"App\Security\Voter\UserVoter"

Access decision log

# Result Attributes Object
1 DENIED ROLE_USER 
null
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
2 DENIED moderate 
App\Entity\EntryComment {#1369
  +user: Proxies\__CG__\App\Entity\User {#1370 …}
  +entry: App\Entity\Entry {#1856 …}
  +magazine: App\Entity\Magazine {#312
    +icon: Proxies\__CG__\App\Entity\Image {#293 …}
    +name: "askelectronics@discuss.tchncs.de"
    +title: "askelectronics"
    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 154
    +entryCommentCount: 1230
    +postCount: 1
    +postCommentCount: 4
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729413608 {#320
      date: 2024-10-20 10:40:08.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#284 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
    +entries: Doctrine\ORM\PersistentCollection {#227 …}
    +posts: Doctrine\ORM\PersistentCollection {#185 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
    +bans: Doctrine\ORM\PersistentCollection {#164 …}
    +reports: Doctrine\ORM\PersistentCollection {#150 …}
    +badges: Doctrine\ORM\PersistentCollection {#128 …}
    +logs: Doctrine\ORM\PersistentCollection {#118 …}
    +awards: Doctrine\ORM\PersistentCollection {#107 …}
    +categories: Doctrine\ORM\PersistentCollection {#94 …}
    -id: 11
    +apId: "askelectronics@discuss.tchncs.de"
    +apProfileId: "https://discuss.tchncs.de/c/askelectronics"
    +apPublicUrl: "https://discuss.tchncs.de/c/askelectronics"
    +apFollowersUrl: "https://discuss.tchncs.de/c/askelectronics/followers"
    +apInboxUrl: "https://discuss.tchncs.de/inbox"
    +apDomain: "discuss.tchncs.de"
    +apPreferredUsername: "askelectronics"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1727247714 {#321
      date: 2024-09-25 09:01:54.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1687144409 {#315
      date: 2023-06-19 05:13:29.0 +02:00
    }
  }
  +image: null
  +parent: null
  +root: null
  +body: """
    I wouldn’t use the PAM2804. The datasheet recommends a PWM frequency of 500 Hz, and if you look at the “PWM Dimming: ILED vs. Duty Cycle” chart on page 5 you can see why - at 1 kHz there is already a significant reduction in the average LED current. The enable response just isn’t fast enough to modulate at 38 kHz - by the time you want to turn it off, it will barely be on.\n
    \n
    This isn’t quite enough for your 38 kHz either, but it’s closer (and waaaay more complicated): [MAX16834](https://www.analog.com/en/products/max16834.html#product-overview). The datasheet says it can do up to 20 kHz, but at a glance I did not see a particular spec that seems to actually limit that.\n
    \n
    [Here’s an article](https://e2e.ti.com/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming) about fast switching LEDs. All the linked products unfortunately have supply voltage ratings above yours, so they won’t work. But it discusses the concept of shunt dimming, where you’d end up simply bypassing the current around the LED rather than actually turning off the current regulator. Inefficient, yes.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 2
  +score: 0
  +lastActive: DateTime @1688433083 {#1769
    date: 2023-07-04 03:11:23.0 +02:00
  }
  +ip: null
  +tags: null
  +mentions: [
    "@silvio2402@discuss.tchncs.de"
  ]
  +children: Doctrine\ORM\PersistentCollection {#1371 …}
  +nested: Doctrine\ORM\PersistentCollection {#1379 …}
  +votes: Doctrine\ORM\PersistentCollection {#2446 …}
  +reports: Doctrine\ORM\PersistentCollection {#1891 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2409 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2358 …}
  -id: 7512
  -bodyTs: "'/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming)':132 '/en/products/max16834.html#product-overview).':98 '1':37 '20':107 '38':61,84 '5':31 '500':14 'actual':123,175 'alreadi':41 'around':170 'articl':129 'averag':47 'bare':74 'bypass':167 'chart':28 'closer':90 'complic':94 'concept':157 'current':49,169,179 'cycl':27 'd':163 'datasheet':8,100 'dim':23,160 'discuss':155 'duti':26 'e2e.ti.com':131 'e2e.ti.com/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming)':130 'either':86 'enabl':51 'end':164 'enough':57,81 'fast':56,134 'frequenc':12 'glanc':112 'hz':15 'ile':24 'ineffici':181 'isn':54,78 'khz':38,62,85,108 'led':48,136,172 'limit':124 'link':139 'look':19 'max16834':95 'modul':59 'page':30 'pam2804':6 'particular':118 'product':140 'pwm':11,22 'quit':80 'rate':145 'rather':173 'recommend':9 'reduct':44 'regul':180 'respons':52 'say':101 'see':34,116 'seem':121 'shunt':159 'signific':43 'simpli':166 'spec':119 'suppli':143 'switch':135 'time':65 'turn':69,176 'unfortun':141 'use':4 'voltag':144 'vs':25 'waaaay':92 'want':67 'won':150 'work':152 'wouldn':2 'www.analog.com':97 'www.analog.com/en/products/max16834.html#product-overview).':96 'yes':182"
  +ranking: 0
  +commentCount: 0
  +upVotes: 0
  +downVotes: 0
  +visibility: "visible             "
  +apId: "https://lemmy.world/comment/788676"
  +editedAt: DateTimeImmutable @1688426164 {#1945
    date: 2023-07-04 01:16:04.0 +02:00
  }
  +createdAt: DateTimeImmutable @1688426087 {#1368
    date: 2023-07-04 01:14:47.0 +02:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
3 DENIED edit 
App\Entity\EntryComment {#1369
  +user: Proxies\__CG__\App\Entity\User {#1370 …}
  +entry: App\Entity\Entry {#1856 …}
  +magazine: App\Entity\Magazine {#312
    +icon: Proxies\__CG__\App\Entity\Image {#293 …}
    +name: "askelectronics@discuss.tchncs.de"
    +title: "askelectronics"
    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 154
    +entryCommentCount: 1230
    +postCount: 1
    +postCommentCount: 4
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729413608 {#320
      date: 2024-10-20 10:40:08.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#284 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
    +entries: Doctrine\ORM\PersistentCollection {#227 …}
    +posts: Doctrine\ORM\PersistentCollection {#185 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
    +bans: Doctrine\ORM\PersistentCollection {#164 …}
    +reports: Doctrine\ORM\PersistentCollection {#150 …}
    +badges: Doctrine\ORM\PersistentCollection {#128 …}
    +logs: Doctrine\ORM\PersistentCollection {#118 …}
    +awards: Doctrine\ORM\PersistentCollection {#107 …}
    +categories: Doctrine\ORM\PersistentCollection {#94 …}
    -id: 11
    +apId: "askelectronics@discuss.tchncs.de"
    +apProfileId: "https://discuss.tchncs.de/c/askelectronics"
    +apPublicUrl: "https://discuss.tchncs.de/c/askelectronics"
    +apFollowersUrl: "https://discuss.tchncs.de/c/askelectronics/followers"
    +apInboxUrl: "https://discuss.tchncs.de/inbox"
    +apDomain: "discuss.tchncs.de"
    +apPreferredUsername: "askelectronics"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1727247714 {#321
      date: 2024-09-25 09:01:54.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1687144409 {#315
      date: 2023-06-19 05:13:29.0 +02:00
    }
  }
  +image: null
  +parent: null
  +root: null
  +body: """
    I wouldn’t use the PAM2804. The datasheet recommends a PWM frequency of 500 Hz, and if you look at the “PWM Dimming: ILED vs. Duty Cycle” chart on page 5 you can see why - at 1 kHz there is already a significant reduction in the average LED current. The enable response just isn’t fast enough to modulate at 38 kHz - by the time you want to turn it off, it will barely be on.\n
    \n
    This isn’t quite enough for your 38 kHz either, but it’s closer (and waaaay more complicated): [MAX16834](https://www.analog.com/en/products/max16834.html#product-overview). The datasheet says it can do up to 20 kHz, but at a glance I did not see a particular spec that seems to actually limit that.\n
    \n
    [Here’s an article](https://e2e.ti.com/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming) about fast switching LEDs. All the linked products unfortunately have supply voltage ratings above yours, so they won’t work. But it discusses the concept of shunt dimming, where you’d end up simply bypassing the current around the LED rather than actually turning off the current regulator. Inefficient, yes.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 2
  +score: 0
  +lastActive: DateTime @1688433083 {#1769
    date: 2023-07-04 03:11:23.0 +02:00
  }
  +ip: null
  +tags: null
  +mentions: [
    "@silvio2402@discuss.tchncs.de"
  ]
  +children: Doctrine\ORM\PersistentCollection {#1371 …}
  +nested: Doctrine\ORM\PersistentCollection {#1379 …}
  +votes: Doctrine\ORM\PersistentCollection {#2446 …}
  +reports: Doctrine\ORM\PersistentCollection {#1891 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2409 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2358 …}
  -id: 7512
  -bodyTs: "'/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming)':132 '/en/products/max16834.html#product-overview).':98 '1':37 '20':107 '38':61,84 '5':31 '500':14 'actual':123,175 'alreadi':41 'around':170 'articl':129 'averag':47 'bare':74 'bypass':167 'chart':28 'closer':90 'complic':94 'concept':157 'current':49,169,179 'cycl':27 'd':163 'datasheet':8,100 'dim':23,160 'discuss':155 'duti':26 'e2e.ti.com':131 'e2e.ti.com/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming)':130 'either':86 'enabl':51 'end':164 'enough':57,81 'fast':56,134 'frequenc':12 'glanc':112 'hz':15 'ile':24 'ineffici':181 'isn':54,78 'khz':38,62,85,108 'led':48,136,172 'limit':124 'link':139 'look':19 'max16834':95 'modul':59 'page':30 'pam2804':6 'particular':118 'product':140 'pwm':11,22 'quit':80 'rate':145 'rather':173 'recommend':9 'reduct':44 'regul':180 'respons':52 'say':101 'see':34,116 'seem':121 'shunt':159 'signific':43 'simpli':166 'spec':119 'suppli':143 'switch':135 'time':65 'turn':69,176 'unfortun':141 'use':4 'voltag':144 'vs':25 'waaaay':92 'want':67 'won':150 'work':152 'wouldn':2 'www.analog.com':97 'www.analog.com/en/products/max16834.html#product-overview).':96 'yes':182"
  +ranking: 0
  +commentCount: 0
  +upVotes: 0
  +downVotes: 0
  +visibility: "visible             "
  +apId: "https://lemmy.world/comment/788676"
  +editedAt: DateTimeImmutable @1688426164 {#1945
    date: 2023-07-04 01:16:04.0 +02:00
  }
  +createdAt: DateTimeImmutable @1688426087 {#1368
    date: 2023-07-04 01:14:47.0 +02:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
4 DENIED moderate 
App\Entity\EntryComment {#1369
  +user: Proxies\__CG__\App\Entity\User {#1370 …}
  +entry: App\Entity\Entry {#1856 …}
  +magazine: App\Entity\Magazine {#312
    +icon: Proxies\__CG__\App\Entity\Image {#293 …}
    +name: "askelectronics@discuss.tchncs.de"
    +title: "askelectronics"
    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 154
    +entryCommentCount: 1230
    +postCount: 1
    +postCommentCount: 4
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729413608 {#320
      date: 2024-10-20 10:40:08.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#284 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
    +entries: Doctrine\ORM\PersistentCollection {#227 …}
    +posts: Doctrine\ORM\PersistentCollection {#185 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
    +bans: Doctrine\ORM\PersistentCollection {#164 …}
    +reports: Doctrine\ORM\PersistentCollection {#150 …}
    +badges: Doctrine\ORM\PersistentCollection {#128 …}
    +logs: Doctrine\ORM\PersistentCollection {#118 …}
    +awards: Doctrine\ORM\PersistentCollection {#107 …}
    +categories: Doctrine\ORM\PersistentCollection {#94 …}
    -id: 11
    +apId: "askelectronics@discuss.tchncs.de"
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    +apInboxUrl: "https://discuss.tchncs.de/inbox"
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    +apPreferredUsername: "askelectronics"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
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    +apFetchedAt: DateTime @1727247714 {#321
      date: 2024-09-25 09:01:54.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1687144409 {#315
      date: 2023-06-19 05:13:29.0 +02:00
    }
  }
  +image: null
  +parent: null
  +root: null
  +body: """
    I wouldn’t use the PAM2804. The datasheet recommends a PWM frequency of 500 Hz, and if you look at the “PWM Dimming: ILED vs. Duty Cycle” chart on page 5 you can see why - at 1 kHz there is already a significant reduction in the average LED current. The enable response just isn’t fast enough to modulate at 38 kHz - by the time you want to turn it off, it will barely be on.\n
    \n
    This isn’t quite enough for your 38 kHz either, but it’s closer (and waaaay more complicated): [MAX16834](https://www.analog.com/en/products/max16834.html#product-overview). The datasheet says it can do up to 20 kHz, but at a glance I did not see a particular spec that seems to actually limit that.\n
    \n
    [Here’s an article](https://e2e.ti.com/blogs_/b/powerhouse/posts/led-brightness-adjustment-high-frequency-pwm-dimming) about fast switching LEDs. All the linked products unfortunately have supply voltage ratings above yours, so they won’t work. But it discusses the concept of shunt dimming, where you’d end up simply bypassing the current around the LED rather than actually turning off the current regulator. Inefficient, yes.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 2
  +score: 0
  +lastActive: DateTime @1688433083 {#1769
    date: 2023-07-04 03:11:23.0 +02:00
  }
  +ip: null
  +tags: null
  +mentions: [
    "@silvio2402@discuss.tchncs.de"
  ]
  +children: Doctrine\ORM\PersistentCollection {#1371 …}
  +nested: Doctrine\ORM\PersistentCollection {#1379 …}
  +votes: Doctrine\ORM\PersistentCollection {#2446 …}
  +reports: Doctrine\ORM\PersistentCollection {#1891 …}
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