LED

OZ9967 Datasheet – Six String High Power LED Controller

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Part Number: OZ9967, OZ9967GN

Function: Six String High Power LED Controller

Package: 28 SOP, SSOP, TSSOP, Lead-free Pin Type

Manufacturer: O2Micro

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OZ9967 datasheet led controller

Description

The OZ9967 is an LED controller that drives up to six (6) strings of LEDs in parallel confi guration, with multiple LEDs per string connected in series. It provides six (6) LED current sense inputs in an “OR” confi guration to improve backlight reliability. This allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. OZ9967 supports external Pulse Width Modulation (PWM) or internal Low frequency PWM (LPWM) dimming control. Plus, it provides an integrated circuit to balance the current fl ow through each LED string. The balance transistors are external to accommodate different power dissipation resulting from the forward voltage difference
among the LED strings.

Pinout

OZ9967 pinout

Features

1. High frequency DC/DC boost converter controller

2. Drives 6 LED strings in parallel

3. Integrated LED current balance control circuit

4. Up to 1MHz switching frequency

5. External PWM or internal LPWM dimming control

6. LED short circuit protection

7. Over-current and over-voltage protection

8. Soft start function

Applications

1. LCD Monitor

2. LCD TV

OZ9967 Datasheet

CL6808 PDF Datasheet – 1.2A LED Driver – Chiplink

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This post describes for the LED Driver. An LED driver is an electronic device that regulates and controls the power supplied to light-emitting diodes (LEDs).

The Part Number is CL6808.

The package is SOT89-5 type.

The function of this semiconductor is 1.2A LED driver with internal switch.

The manufacturer of this part is CHIPLINK.

See the preview image and the PDF file for more information.

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CL6808 datasheet pdf

Description

The CL6808 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 7V and 40V and provides an externally adjustable output current of up to 1.2A. Depending upon supply voltage and external components, this can provide up to 35 watts of output power. The CL6808 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current.

Features

  • Wide input voltage range: 6V to 35V
  • Adjustable constant output current up to 1.2A
  • Integrated power switch (no external MOSFET required)
  • High efficiency: up to 95%
  • High-side current sensing using external resistor
  • Simple design with low external component count
  • Single-pin control for ON/OFF and brightness (DC or PWM dimming)
  • Soft-start function to limit inrush current
  • Typical ±5% LED current accuracy
  • Inherent open-circuit LED protection

Design Notes

  • Inductor selection is critical: choose based on ripple current (typically 20–40% of ILED)
  • Use low ESR capacitors to reduce output ripple and improve stability
  • Schottky diode is recommended for higher efficiency
  • PWM dimming frequency should be chosen to avoid visible flicker (>1 kHz typical)
  • Thermal design is important at high currents—ensure adequate copper area for heat dissipation
  • Layout should minimize loop area of switching path to reduce EMI

Block Diagram

CL6808 pdf datasheet

Advantages

  • Minimal external components → reduced BOM cost
  • Integrated switch simplifies design
  • High efficiency improves thermal performance
  • Flexible dimming control (analog + PWM)
  • Robust protection features

Typical Applications

  • LED retrofit lamps (halogen replacement)
  • Automotive lighting systems
  • Industrial LED lighting
  • Emergency and backup lighting
  • Signage and display illumination

Alternative / Equivalent Products

  • PT4115 – Popular LED buck driver (lower power range)
  • HV9910 – Offline/high-voltage LED driver
  • LM3404 – TI constant current LED driver
  • AL8805 – Diodes Inc. LED driver
  • MP24833 – MPS LED driver IC

CL6808 PDF Datasheet