# FL7733AMX

**onsemi** · LED Drivers · SOIC-8

FL7733AMX from onsemi, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CS | input | Current sense: a current-sense resistor connects here to detect MOSFET current for constant output current regulation. |
| 2 | GATE | output | PWM signal output driving the power MOSFET through an internal totem-pole output driver. |
| 3 | GND | power_in | Ground reference for the controller; the datasheet's PCB guidance says signal ground and power ground should join only at this pin. |
| 4 | VDD | power_in | Power supply pin that provides both the IC operating current and the MOSFET gate-drive current; UVLO turn-on is 16 V and turn-off is 7.75 V, and VDD OVP is 23 to 25 V. |
| 5 | VS | power_in | Voltage sense that detects output voltage and discharge time for constant-current regulation, connected through a resistor divider to the transformer auxiliary winding; the output overvoltage threshold is 3.00 V typical. |
| 6 | COMI | passive | Constant-current loop compensation pin, with a capacitor (typically above 1 µF) connected between COMI and GND to compensate the current-loop gain. |
| 7 | NC | unconnected | Not connected. |
| 8 | HV | input | High-voltage pin connected to the rectified input through a resistor; the datasheet rates the HV pin voltage at 700 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | LED Drivers |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| HV 引脚电压 | HV |  |  | 700 | V |  | 5 |
| 直流电源电压 | VVDD |  |  | 30 | V |  | 5 |
| VS 引脚输入电压 | VVS | -0.3 |  | 6 | V |  | 5 |
| CS 引脚输入电压 | VCS | -0.3 |  | 6 | V |  | 5 |
| COMI 引脚输入电压 | VCOMI | -0.3 |  | 6 | V |  | 5 |
| GATE 引脚输入电压 | VGATE | -0.3 |  | 30 | V |  | 5 |
| 功耗 | PD |  |  | 633 | mW | TA<50℃ | 5 |
| 最大结温 | TJ |  |  | 150 | ℃ |  | 5 |
| 存储温度范围 | TSTG | -55 |  | 150 | ℃ |  | 5 |
| 引脚温度（焊接） | TL |  |  | 260 | ℃ | 10 秒 | 5 |
| 导通阈值电压 | VDD-ON | 14.5 | 16 | 17.5 | V |  | 6 |
| 关断阈值电压 | VDD-OFF | 6.75 | 7.75 | 8.75 | V |  | 6 |
| 工作电流 | IDD-OP | 3 | 4 | 5 | mA | CL=1 nF，f=fMAX-CC | 6 |
| 启动电流（两值，列位置待确认） | IDD-ST | 30 |  | 50 | μA | VDD=VDD-ON-1.6 V | 6 |
| VDD 过压保护水平 | VVDD-OVP | 23 | 24 | 25 | V |  | 6 |
| 上升时间 | tR | 100 | 150 | 200 | ns | TA=25℃, VDD=15 V, CLOAD =1 nF | 6 |
| 下降时间 | tF | 20 | 60 | 100 | ns | TA=25℃, VDD=15 V, CLOAD=1 nF | 6 |
| 输出箝位电压 | VCLAMP | 12 | 15 | 18 | V | VDD=20 V, VCS=0 V, VVS=0 V, VCOM=0 V | 6 |
| 启动后的漏电流（两值，列位置待确认） | IHV-LC | 1 |  | 10 | μA |  | 6 |
| 启动后的 JFET 调节时间 | tR-JFET | 190 | 250 | 310 | ms | TA=25℃ | 6 |
| JFET 调节电压上限 | VJFET-HL | 17.5 | 19 | 20.5 | V |  | 6 |
| JFET 调节电压下限 | VJFET-LL | 11.5 | 13 | 14.5 | V |  | 6 |
| 跨导 | gM | 11 | 17 | 23 | μmho | TA=25℃ | 6 |
| COMI 灌电流 | ICOMI-SINK | 12 | 18 | 24 | μA | TA=25℃, VEAI=2.55 V, VCOMI=5 V | 6 |
| /COMI 源电流/ | ICOMI-SOURCE | 12 | 18 | 24 | μA | TA=25℃, VEAI=0.45 V, VCOMI=0 V | 6 |
| tDIS：VS 消隐时间 | tDIS-BNK | 0.85 | 1.15 | 1.45 | μs |  | 7 |
| VS：VS 消隐电流 | IVS-BNK | -75 | -90 | -105 | μA |  | 7 |
| VS：输出过压保护电平 | VVS-OVP | 2.95 | 3 | 3.15 | V |  | 7 |
| VS：使能低电平限流的阈值电压 | VVS-LOW-CL-EN | 0.25 | 0.3 | 0.35 | V |  | 7 |
| VS：禁用低电平限流的阈值电压 | VVS-HIGH-CL-DIS | 0.54 | 0.6 | 0.66 | V |  | 7 |
| VS：输出短路 LED 保护阈值电压 | VVS-SLP-TH | 0.25 | 0.3 | 0.35 | V |  | 7 |
| 参考电压 | VRV | 1.485 | 1.5 | 1.515 | V | TA=25℃ | 7 |
| 到栅极输出端的传播延迟 | tPD | 50 | 100 | 150 | ns |  | 7 |
| 限流阈值上限 | VCS-HIGH-CL | 0.9 | 1 | 1.1 | V |  | 7 |
| 限流阈值下限 | VCS-LOW-CL | 0.16 | 0.2 | 0.24 | V |  | 7 |
| 过流保护的 VCS 阈值电压 | VCS-OCP | 1.2 | 1.35 | 1.5 | V | TA=25℃ | 7 |
| 恒流最大频率 | fMAX-CC | 65 | 70 | 75 | kHz | TA=25℃, VS=3.0 V | 7 |
| 恒流最小频率 | fMIN-CC | 23 | 26.5 | 30 | kHz | TA=25℃, VS=0.3 V | 7 |
| 最大导通时间 | tON-MAX | 11 | 13 | 15 | μs | TA=25℃, f=fMAX-CC | 7 |
| 工作电流（启动电流对应行之前的 IHV 源电流） | IHV |  | 9 |  | mA | TA=25℃, VIN=90 VAC, VDD=0 V | 6 |
| 输出低电平 | VOL |  | 1.5 |  | V | TA=25℃, VDD=20 V, IDD_GATE=1 mA | 6 |
| 输出高电平 | VOH |  | 5 |  | V | TA=25℃, VDD=10 V, IDD=1 mA | 6 |
| 峰值源电流 | ISOURCE |  | -60 |  | mA | VDD=10 ~ 20 V | 6 |
| 峰值吸电流 | ISINK |  | 180 |  | mA | VDD=10 ~ 20 V | 6 |
| COMI 高电平 | VCOMI-HGH |  | 4.7 |  | V | VEAI=0 V | 6 |
| COMI 低电平 | VCOMI-LOW |  | 0.1 |  | V | VEAI=5 V | 6 |
| 初始 COMI 箝位电压 | VCOMI_INT.CLP |  | 1.2 |  | V |  | 6 |
| 初始 COMI 箝位时间 | tCOMI_INT.CLP |  | 15 |  | ms |  | 6 |
| 启动后检测禁用时间 | tSLP-BNK |  | 15 |  | ms | TA=25℃ | 7 |
| 前沿消隐时间 | tLEB |  | 300 |  | ns |  | 7 |
| CC 最低导通时间 | tMIN |  | 500 |  | ns | VCOMI=0 V | 7 |
| 启动时的低电流模式工作时间 | tLOW-CM |  | 20 |  | ms |  | 7 |
| 检测电阻短路保护的 VCS 阈值电压 | VCS-SRSP |  | 0.1 |  | V |  | 7 |
| 线路补偿电压与 VS 电流的关系 | VCS / IVS |  | 21.5 |  | V/A |  | 7 |
| OTP 阈值温度 | TOTP |  | 150 |  | ℃ |  | 7 |
| 重启结温滞回 | TOTP-HYS |  | 10 |  | ℃ |  | 7 |
| 节-环境之间热阻 | JA |  | 158 |  | ℃/W |  | 5 |
| 结壳热阻 | JC |  | 39 |  | ℃/W |  | 5 |

## CAD (KiCad official)

- Symbol: `FL7733AMX`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `fl7733amx-etched.step` / `fl7733amx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fl7733amx.step` / `fl7733amx.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884255841112064) (15 pp, sha256 `7cbbccfd40894c34`, retrieved 2026-10-19, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/fl7733amx-datasheet.pdf)