Sn51dp Datasheet

The SN51DP is part of a family of operational amplifiers designed to offer a good balance between performance and power consumption. It features:

The SN51DP is a Zero-Cross Phototriac Coupler (also called a Phototriac or SSR driver). It is designed to interface low-voltage control logic (e.g., microcontrollers, 5V logic) with high-voltage AC loads (e.g., motors, solenoids, heaters, lamps) by driving an external power triac or directly controlling small AC loads.

Understanding the pinout is the primary reason engineers search for the SN51DP datasheet. The pin assignment (seen from the front, pins facing down) is as follows:

| Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | VIN | Input voltage (unregulated DC supply). Bypass with a low-ESR capacitor close to this pin. | | 2 | SW (Output) | Switching node – connects to the inductor and catch diode. Handles high current. | | 3 | GND | Ground reference. Must be connected to the system ground plane. | | 4 | FB (Feedback) | Voltage feedback input. Connected to a resistor divider from the output to set the desired voltage. | | 5 | COMP (Compensation) | Frequency compensation pin. A capacitor and resistor network to ground stabilizes the control loop. |

Note: Some variants may swap pins 4 and 5 or include an enable function. Always verify with a multimeter and known schematic.

Microcontroller Pin → Resistor (270 Ω) → SN51DP Pin 1 (Anode)
SN51DP Pin 2 (Cathode) → GND
SN51DP Pin 4 (Output) → Power Triac Gate (via 180–330 Ω resistor)
SN51DP Pin 6 (Output) → Power Triac MT2 (or neutral line)
Power Triac MT1/MT2 in series with load on AC line.
 sn51dp datasheet

Critical external components:

The SN51DP is an ON-BRIG, 10-pin MSOP/SSOP digital pulse width modulator (DPWM) functioning as a LED TV backlight driver for brands like Arielli and Crown. Operating with a 3.5V to 7V supply and providing 8-bit resolution, this IC manages backlight, protection, and dimming in LED TV main boards. For technical details and to view the component, visit NETASHOP.GR SN51DP LED TV DRIVER - NETASHOP.GR

The SN51DP is a standalone digital pulse width modulator (DPWM) IC, often used as an LCD power chip or for motor and LED control. While a single official manufacturer PDF is not universally indexed, key technical parameters can be aggregated from reputable component distributors and listings. Core Specifications Maximum Input Voltage: 6V.

Critical Note: It cannot withstand 24V industrial rails directly; voltage spikes exceeding 6.5V will damage the chip. The SN51DP is part of a family of

Operating Voltage (Regulated): Includes an on-chip 3.3V regulator. Resolution: Programmable up to 8-bits.

Package Type: Commonly found in MSOP-10 or MSOP-8 surface-mount packages.

Protection: Features integrated power/ground planes and ESD protection on I/O pins. Common Applications

LCD Power Management: Often listed as an LCD power control chip in repair contexts.

Motor Control: Used for high-speed, precision DC motor speed control. Lighting: Integrated into LED lighting control systems. Availability & Sourcing Microcontroller Pin → Resistor (270 Ω) → SN51DP

This part is frequently available through major electronic component aggregators and marketplaces:

Utsource: Provides a technical summary and stock availability.

AliExpress: Typically sold in lots (e.g., 10pcs/lot) for repair and prototyping.

IC-Components: Lists specific protection requirements for EMI and transient scenarios. SN51DP EMI | IC-Components

The SN51DP has a maximum input voltage of 6V; it cannot withstand direct connection to 24V industrial rails. In such environments, IC Components

From reviewing historical datasheet fragments and circuit diagrams, the SN51DP boasts the following features: