Sn51dp Datasheet — High Quality

How overcurrent, overvoltage, and overtemperature protection trigger and reset.

A high-quality SN51DP datasheet is machine-searchable, contains no watermarks obscuring text, and ideally includes revision history and manufacturer’s application notes.

| Parameter | Min | Max | Unit | |--------------------|----------|-----------|------| | VIN to GND | -0.3 | +40 | V | | SW to GND | -2 | VIN + 0.3 | V | | EN, FB, COMP to GND| -0.3 | +6 | V | | Storage temp | -55 | +150 | °C |

Beyond the technical text, the "high quality" label applies to the authenticity and consistency of the component itself. When reviewing the datasheet and sourcing the SN51DP, consider:

Let’s reconstruct a typical pinout based on recognized SN51DP variants (Sanken, ST, or generic equivalents). Most SN51DP devices follow an 8-pin DIP arrangement:

| Pin | Name | Description | |-----|------|-------------| | 1 | VCC | Power supply input (usually 8V to 25V) | | 2 | GND | Ground reference | | 3 | FB | Feedback input (connects to optocoupler or voltage divider) | | 4 | CS | Current sense input (monitors MOSFET source current via resistor) | | 5 | NC | No connect or internal test point | | 6 | DRAIN | Internal high-voltage MOSFET drain | | 7 | NC | No connect | | 8 | VSTR | High-voltage start-up (connected to bulk DC link voltage) | sn51dp datasheet high quality

Critical insight: Pin 8 (VSTR) allows the IC to power itself from the rectified mains until the auxiliary winding takes over after startup. This eliminates the need for an external depletion MOSFET.

This summary is based on publicly available data from reputable manufacturer sources. Always refer to the latest official SN51DP datasheet for design validation.

The SN51DP is a specialized integrated circuit primarily utilized as an LED backlight driver for modern LCD TVs and monitors, often found in brands like Arielli, Crown, and Coocaa. It is commonly housed in a compact 10-pin SSOP/MSOP package, making it suitable for high-density board designs. Technical Specifications Primary Function

Standalone Digital Pulse Width Modulator (DPWM) / LED Driver Supply Voltage ( VINcap V sub cap I cap N end-sub )

Typically operates within 3.5V to 7V (Abs. Max: 6V-7V depending on source) Operating Temp -20°C to +130°C (Extended industrial range) Key Pins | Parameter | Min | Max | Unit

VIN, DIM (Dimming), GATE (Output), OVP (Over Voltage Protection), CS (Current Sense), FB (Feedback) Protection

Integrated Over-Voltage Protection (OVP) and ESD protection on I/O pins Pros and Design Considerations

High Precision: Features high-speed, 8-bit programmable resolution for smooth LED dimming and DC motor speed control.

Reliability: Includes an on-chip 3.3V regulator and low-jitter operation to ensure stable performance in sensitive display electronics.

Protection Vulnerability: It lacks an active soft-start. Designers should avoid large output capacitors ( This summary is based on publicly available data

) without protection, as they can trigger Under-Voltage Lockout (UVLO) or damage the chip during power-up.

Bypassing Protection: In repair scenarios where protection needs to be temporarily bypassed for testing, a 10K resistor is often connected from Pin 9 (OVP/GATE) to Ground. Application & Substitutes

The SN51DP is essential for LED TV backlight inverters. If a direct replacement is unavailable, technicians frequently use the OB3350CP as a compatible substitute in repair workflows. LED driver IC replacement.

The SN51DP is a high-voltage, dual P-channel MOSFET designed for switching and load-management in power supply and battery-protection applications. This article summarizes its core features, electrical characteristics, typical applications, and layout/reliability considerations for designers.