# LD7575PN

**Leadtrend Tech** · AC-DC Controllers And Regulators · DIP-8

LD7575PN from Leadtrend Tech, 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 | RT | input | Programs the switching frequency through a resistor to ground, with f_SW = 65.0 kHz × (100 kΩ / RT) and a suggested operating range of 50 kHz to 130 kHz. |
| 2 | COMP | input | Voltage feedback input from the secondary-side TL431 through a photocoupler; pulling it below 1.2 V turns the gate output off, and VCOMP held above the 5.0 V OLP threshold for more than 30 ms activates over-load protection. |
| 3 | CS | input | Current sense input for peak-current control and pulse-by-pulse limiting, with a maximum threshold of 0.85 V and 350 ns leading-edge blanking; an R-C filter is strongly recommended in higher-power designs to keep the negative turn-on spike above -0.3 V. |
| 4 | GND | power_in | Ground reference for the controller and the gate driver. |
| 5 | OUT | output | Gate drive output (CMOS buffer, typical 500 mA drive capability) that drives the external power MOSFET directly, with a gate pull-low resistor recommended for fault protection. |
| 6 | VCC | power_in | Supply voltage pin with a recommended range of 11 V to 25 V and a Vcc capacitor of 10 µF to 47 µF; UVLO turns on at 16 V and off at 10 V, and OVP trips at 27.5 V typical (absolute maximum 30 V). |
| 7 | NC | unconnected | Unconnected pin; no electrical connection is specified. |
| 8 | HV | input | Connect to the positive terminal of the bulk capacitor to supply start-up current (HV rated -0.3 V to 500 V); the HV current source turns off once VCC reaches UVLO(on), and a 10 kΩ series resistor is recommended on the Hi-V path. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Leadtrend Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| High-Voltage Current Source |  | 0.5 | 1 | 1.5 | mA | Vcc < UVLO(on), HV=500V | 5 |
| Off-State Leakage Current |  |  |  | 35 | µA | Vcc > UVLO(off), HV=500V | 5 |
| Startup Current |  |  |  | 100 | µA |  | 5 |
| Operating Current |  |  | 2 | 3 | mA | VCOMP=0V; with 1nF load on OUT pin | 5 |
| Operating Current |  |  | 2.5 | 4 | mA | VCOMP=3V; with 1nF load on OUT pin | 5 |
| Operating Current, protection tripped (OLP, OVP) |  |  |  | 0.5 | mA | Protection tripped (OLP, OVP) | 5 |
| UVLO (off) |  | 9 | 10 | 11 | V |  | 5 |
| UVLO (on) |  | 15 | 16 | 17 | V |  | 5 |
| OVP Level |  | 25 | 27.5 | 30 | V |  | 5 |
| Short Circuit Current |  |  | 1.5 | 2.2 | mA | VCOMP=0V | 5 |
| Open Loop Voltage |  |  | 6 |  | V | COMP pin open | 5 |
| Green Mode Threshold | VCOMP |  | 2.35 |  | V |  | 5 |
| Maximum Input Voltage (CS Pin) |  | 0.8 | 0.85 | 0.9 | V |  | 5 |
| Leading Edge Blanking Time |  |  | 350 |  | nS |  | 5 |
| Input impedance |  |  | 1 |  | MΩ |  | 5 |
| Delay to Output |  |  | 100 |  | nS |  | 5 |
| Frequency (Oscillator RT pin) |  | 60 | 65 | 70 | KHz | RT=100KΩ | 5 |
| Green Mode Frequency |  |  | 20 |  | KHz | Fs=65.0KHz | 5 |
| Temp. Stability |  |  |  | 3 | % | -40°C ~105°C | 5 |
| Voltage Stability |  |  |  | 1 | % | VCC=11V-25V | 5 |
| Output Low Level (OUT pin) |  |  | 1 |  | V | VCC=15V, Io=20mA | 5 |
| Output High Level (OUT pin) |  | 9 |  |  | V | VCC=15V, Io=20mA | 5 |
| Rising Time (OUT pin) |  |  | 50 | 160 | nS | Load Capacitance=1000pF | 5 |
| Falling Time (OUT pin) |  |  | 30 | 60 | nS | Load Capacitance=1000pF | 5 |
| OLP Trip Level |  |  | 5 |  | V |  | 5 |
| OLP Delay Time |  |  | 30 |  | mS | Fs=65KHz | 5 |
| Supply Voltage (Vcc Pin), recommended | VCC | 11 |  | 25 | V |  | 4 |
| Vcc Capacitor |  | 10 |  | 47 | µF |  | 4 |
| Switching Frequency |  | 50 |  | 130 | KHz |  | 4 |
| Supply Voltage | VCC |  |  | 30 | V |  | 4 |
| High-Voltage Pin | HV | -0.3 |  | 500 | V |  | 4 |
| COMP, RT, CS pin voltage |  | -0.3 |  | 7 | V |  | 4 |
| Gate Output Current |  |  |  | 500 | mA |  | 4 |
| Junction Temperature |  |  |  | 150 | °C |  | 4 |
| Operating Ambient Temperature |  | -40 |  | 85 | °C |  | 4 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 4 |
| Lead temperature (soldering) |  |  |  | 260 | °C | Soldering, 10 sec | 4 |
| ESD Voltage Protection, Human Body Model |  |  |  | 3 | KV | Except HV Pin | 4 |
| ESD Voltage Protection, Machine Model |  |  |  | 200 | V | Machine Model | 4 |
| Package Thermal Resistance (DIP-8) |  |  |  | 100 | °C/W |  | 4 |
| Power Dissipation (DIP-8) |  |  |  | 650 | mW | At Ambient Temperature = 85°C | 4 |

## CAD (KiCad official)

- Symbol: `LD7575PN`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `ld7575pn-etched.step` / `ld7575pn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ld7575pn.step` / `ld7575pn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Leadtrend Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588941210182692864) (18 pp, sha256 `52a54b667919e381`, retrieved 2026-10-19, tier: lcsc)
- **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/ld7575pn-datasheet.pdf)