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DK125
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Shenzhen DongKe Semicon DC-DC Converters, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownDK125
Shenzhen DongKe Semicon · DC-DC Converters · DIP-8
DK125 from Shenzhen DongKe Semicon, in a DIP-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 | GND | power_in | Ground pin (接地引脚); the datasheet gives no further electrical limit for this pin. |
| 2 | GND | power_in | Ground pin (接地引脚); the datasheet gives no further electrical limit for this pin. |
| 3 | FB | input | Feedback control pin; the datasheet specifies an external capacitor of 1nF to 10nF on this pin, and FB voltage sets the peak-current limit between 1.5V and 2.5V. |
| 4 | VCC | power_in | Supply pin; the datasheet specifies an external 10uF to 47uF capacitor from this pin to ground, with VCC operating around 4.7V (4.5V to 4.9V) and overvoltage protection at 6.25V to 6.85V. |
| 5 | OC | output | Output pin connected to the internal high-voltage power MOSFET (rated 700V) and externally to the switching transformer; the datasheet's OC overvoltage protection threshold is 600V. |
| 6 | OC | output | Output pin connected to the internal high-voltage power MOSFET (rated 700V) and externally to the switching transformer; the datasheet's OC overvoltage protection threshold is 600V. |
| 7 | OC | output | Output pin connected to the internal high-voltage power MOSFET (rated 700V) and externally to the switching transformer; the datasheet's OC overvoltage protection threshold is 600V. |
| 8 | OC | output | Output pin connected to the internal high-voltage power MOSFET (rated 700V) and externally to the switching transformer; the datasheet's OC overvoltage protection threshold is 600V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen DongKe Semicon |
| Package | DIP-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| 供电电压 VCC | US | -0.3 | 8 | V | 3 | ||
| 供电电流 VCC | IS | 100 | mA | 3 | |||
| 引脚电压 | UPV | -0.3 | V | Maximum printed as VDD+0.3 (not numeric) | 3 | ||
| 功率管耐压 | UPP | -0.3 | 730 | V | 3 | ||
| 峰值电流 | IPEAK | 1300 | mA | 3 | |||
| 总耗散功率 | PTOT | 1000 | mW | 3 | |||
| 工作温度范围 | TR | -25 | 125 | ℃ | 3 | ||
| 储存温度范围 | TSTG | -55 | 155 | ℃ | 3 | ||
| 焊接温度 | TW | 280 | ℃ | 5S | 3 | ||
| VCC 工作电压 | VCC | 4.5 | 4.7 | 4.9 | V | AC 输入 85V-----265V | 3 |
| VCC 启动电压 | VCC | 4.9 | V | AC 输入 85V-----265V | 3 | ||
| VCC 重启电压 | VCC | 3.3 | 3.6 | 3.9 | V | AC 输入 85V-----265V | 3 |
| VCC 保护电压 | VCC | 6.25 | 6.55 | 6.85 | V | AC 输入 85V-----265V | 3 |
| VCC 工作电流 | 50 | mA | VCC=5V，FB=1.5V | 3 | |||
| 高压启动电流 | 0.3 | 0.6 | 1.2 | mA | AC 输入 85V----265V | 3 | |
| 启动时间 | 500 | ms | AC 输入 85V | 3 | |||
| 功率管耐压 | 700 | 700 | V | Ioc=1mA | 3 | ||
| 功率管保护电压 | 540 | 600 | 660 | V | 测量 OC 电压 | 3 | |
| 峰值电流保护 | 1100 | 1200 | 1300 | mA | VCC=5V FB=1.5V, 2.8V | 3 | |
| 最小开通时间 | 500 | ns | VCC=5V FB=2.6V | 3 | |||
| PWM 输出频率 | 61 | 65 | 69 | KHz | VCC=5V FB=1.5V, 2.5V | 3 | |
| 调制步进频率 | 20 | 22 | 24 | KHz | VCC=5V FB=2.5V, 2.8V | 3 | |
| 占空比 | 5 | 70 | % | VCC=5V FB=1.5V, 2.5V | 3 | ||
| 短路保护阀值 | 1.15 | 1.33 | 1.5 | V | 测量 FB 电压 | 4 | |
| 变频阀值电压 | 2.3 | 2.5 | 2.7 | V | 测量 FB 电压 | 4 | |
| 突发模式阀值 | 2.6 | 2.8 | 3 | V | 测量 FB 电压 | 4 | |
| 温度保护 | 120 | 130 | 140 | ℃ | 结温 | 4 | |
| 待机功耗 | 270 | mW | AC 输入 265V，空载 | 4 | |||
| 调制步进频率 | 0.5 | KHz | VCC=5V FB=1.5V, 2.5V | 3 | |||
| 前沿消隐时间 | 250 | ns | VCC=5V FB=1.5V, 2.5V | 3 |
CAD (KiCad official)
- Symbol:
DK125 - Footprint:
Package_DIP:DIP-8_W7.62mm - 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files:
dk125-etched.step/dk125-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);dk125.step/dk125.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shenzhen DongKe Semicon datasheet (9 pp, sha256
ac8bd054f97b1eb2, retrieved 2026-10-14, 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, primaryclaude-haiku-5-5(text), consensusclaude-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).