Sn51dp Datasheet [repack] May 2026
The SN51DP is a specialized Integrated Circuit (IC) primarily utilized as a backlight LED driver in modern LCD and LED televisions. Designed for power management within the display panel, it regulates the current flowing to the backlight LED strips to ensure consistent brightness and protection against voltage spikes. The chip is typically manufactured by ON-Brig and is commonly found in the power supply or scaler boards of brands like Sony, VU, and other LED TV models. Core Specifications and Technical Details
The SN51DP is engineered for precision and reliability in high-speed data and power environments. Below are the technical parameters typically found in its datasheet:
Package Type: Commonly available in MSOP-10 (Mini Small Outline Package) or SOP-10 formats, suitable for space-constrained PCB layouts.
Operating Voltage Range: It typically operates with a supply voltage between 3.5V and 7V, with a typical center around 5V.
Temperature Tolerance: Designed for industrial-grade environments, it can withstand temperatures from -20°C to +130°C.
Control Mechanism: Features PWM (Pulse Width Modulation) dimming support to adjust display brightness dynamically.
Protection Features: Includes built-in Over Voltage Protection (OVP) and thermal shutdown to prevent catastrophic board failure. Pin Configuration (MSOP-10 / SOP-10)
Understanding the pinout is critical for troubleshooting or replacement. Based on schematic data from Electronica Max and Scribd, here is the 10-pin layout: Pin Number Description VIN Main power supply input (up to 12V-22V systems) DIM PWM signal input for backlight dimming control GATE Output signal to the external MOSFET gate GND System ground CS Current sense pin to monitor LED string load ISET
Current set pin; often connected to a resistor to define max output REF Reference voltage output FB Feedback pin for voltage regulation OVP Over Voltage Protection input COMP sn51dp datasheet
Compensation pin for stability of the internal error amplifier Applications in Consumer Electronics
The SN51DP is a staple in the repair industry, particularly for LCD TV backlight repair.
Inverter Protection Bypassing: Technicians often look for ways to bypass the internal protection for diagnostic purposes. For example, connecting a 10K resistor from pin 9 to GND is a known method to temporarily disable the OVP protection during testing.
Replacement & Compatibility: It is often interchangeable with specific backlight controller modules in LED TV power supplies. However, always verify the suffix and manufacturer (ON-Brig) as slight variations in pin behavior can occur between brands. Where to Source the SN51DP
If you are looking to purchase a replacement chip, several international distributors carry stock:
Utsource: Frequently lists the SN51DP with detailed stock availability and pricing.
AliExpress: Often carries bulk lots (e.g., 5PCS/LOT) under the SN51DP MSOP-10 listing for repair professionals.
Troubleshooting Tip: If a TV display "flashes" and then goes dark, the SN51DP may be detecting a fault in the LED strip and triggering its protection mode. Checking the voltage at Pin 9 (OVP) can help determine if the IC is shutting down the system due to a legitimate over-voltage condition or a faulty sensor. The SN51DP is a specialized Integrated Circuit (IC)
The SN51DP is a specialized LED Driver and Power Management IC primarily used as a backlight controller for LCD/LED TVs and industrial displays. It is commonly found on mainboards such as the TP.S506.PB801 and is used in television brands like Arielli, Crown, and Felix. ## Technical Specifications Package Type: SSOP-10 or MSOP-10 (10-pin Surface Mount).
Operating Voltage: Typically operates on a 12V supply for its input (VIN). Max Operating Temp: 85°C.
Functionality: Standalone digital pulse width modulator (DPWM) for precise LED brightness control. ### Pinout Configuration (10-Pin)
Based on available schematics, the pin functions are as follows: Description 1 VIN Supply voltage input (12V typical) 2 GATE Output drive for the external MOSFET 3 GATE- Complementary or ground reference for gate 4 GND Ground connection 5 CS Current Sense (monitors LED current) 6 ISET Current setting pin (reference resistor) 7 REF Internal reference voltage 8 FB Feedback pin for voltage/current regulation 9 OVP / COMP Over-Voltage Protection or Compensation 10 DIM / OPWM Dimming control input (PWM or Analog) ### Protection & Repair Tips The IC Sn51dp schematic , ic inverter by-passing protection
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 an MSOP-10 package, Standalone Digital Pulse Width Modulator (DPWM) driver IC designed by On-Bright to manage backlight LEDs in modern displays. Detailed technical specifications reveal key functionalities including 8-bit precision brightness control via the DIM pin, over-voltage protection (OVP), and high-speed gate driving to manage LED intensity and system safety. Read the full technical specifications at Electronica Max. SN51DP - Electronica Max
Q2: Can I use the SN51DP in a boost (step-up) converter?
A: The datasheet primary application is buck. While theoretically possible, no official reference design exists for boost. Use a dedicated boost controller instead.
Typical Application Circuit: 5V/2A Buck Converter
The most common use of the SN51DP in available documentation is a 12V-to-5V or 24V-to-5V step-down converter. Below is a typical schematic based on the datasheet reference design. C1: 1000µF / 50V (Input filter) C2: 470µF
Components List:
- C1: 1000µF / 50V (Input filter)
- C2: 470µF / 16V (Output filter)
- C3: 0.01µF ceramic (Compensation)
- R1: 1.5kΩ (Feedback top resistor)
- R2: 330Ω (Feedback bottom resistor) – sets Vout = 1.23 * (1 + R1/R2) ≈ 5V
- D1: Schottky diode, 3A / 60V (e.g., SB360, SR360)
- L1: 150µH / 3A (Power inductor, low DCR)
- IC1: SN51DP
Operation Summary: The internal oscillator switches the internal bipolar or MOSFET transistor at ~60kHz. When the switch turns on, current flows through L1 to the output. When off, D1 freewheels the inductor current. The FB pin compares the output voltage (divided by R1/R2) to the internal 1.23V reference, adjusting the duty cycle to maintain regulation.
✅ Strengths
- Low trigger current – works directly with CMOS/TTL logic.
- Zero-crossing – excellent for noise-sensitive applications.
- High isolation – 5 kVrms, meets safety standards (UL, VDE typically).
- Reliable AC switching – no contact bounce or wear.
Q5: What is the difference between SN51DP and SN51DP-H?
A: The "-H" suffix indicates a higher input voltage rating – typically 60V instead of 45V. All other parameters remain the same.
Overview
SN51DP is a high-speed, low-voltage differential signaling (LVDS) compatible differential line driver/receiver pair (assumption: device family similar to SNxx DP series). It’s designed for high-data-rate serial links, video interfaces, and other point-to-point differential transmission where low power, small package, and signal integrity are important.
SN51DP Pinout Configuration (Critical Datasheet Information)
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.
Applications
The SN51DP can be used in various applications, including:
- Audio and Video Equipment: For amplification and processing of audio and video signals.
- Instrumentation: Precision measurement equipment, sensor interfaces.
- Communication Systems: For amplification in communication circuits.
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