controller Archives - Page 5 of 24

The LED Controller learn more.

Part Number: OB3350, OB3350CP

Functions: Light Emitting Diode (LED) driver, controller

Package: SOP 8 Pin Type

Manufacturer: On-Bright Electronics

Image:

OB3350 datasheet controller

Description:

LED driver controller ICs are integrated circuits specifically designed to control and drive LEDs (Light-Emitting Diodes). These ICs provide the necessary circuitry to regulate the current, voltage, and brightness of LEDs, ensuring efficient and reliable operation.

OB3350 is a highly integrated and cost effective Light Emitting Diode (LED) driver optimized for LCD monitor and LCD TV backlighting application. It provides a high performance LED backlight solution with minimized BOM count.

The OB3350 contains a PWM boost driver which uses current mode control and fixed frequency operation to regulate the LED current. The LED current is sensed through an external current sense resistor. The voltage across the sensing resistor is compared with reference level of 300mV, the error is amplified to control the pulse width of the power switch thus to regulate the current flowing the LED.

Features:

1. Current Mode PWM Controller With Good
2. Dynamic Response
3. 8V to 35V Input Voltage Range
4. External PWM Dimming Mode
5. Over Voltage Protection
6. Over Current Protection
7. Under Voltage Lockout (UVLO)
8. Thermal Shutdown

Pinouts:

OB3350 pinout 0B3350

1 VIN: Power Power Supply Input
2 GATE: I/O Gate Driver Output Pin
3 GND: GND Ground
4 CS: I/O Current Sense Input
5 FB: I/O LED Current Feedback Input
6 COMP: I/O Boost Converter Loop Compensation Pin
7 OVP: I/O Over Voltage Protection Sense Input
8 PWM: I/O External PWM Dimming Control

Applications :

1. LCD Monitor
2. LCD TV
3. Flat panel display

When selecting an LED driver controller IC, it’s important to consider factors such as the required LED current and voltage ratings, the desired dimming control method, the power source, and any specific application requirements.

OB3350 Datasheet File

The OZ9998 controller learn more.

Part Number: OZ9998, 0Z9998, OZ9998A

Functions: Eight String High Power LED Controller

Package: 24 E-TSSOP, QFN, SOP Type

Manufacturer: O2Micro

Image:

OZ9998 O2Micro

Description:

An eight-string high-power LED controller typically refers to a device or circuit designed to control the operation of multiple high-power LEDs arranged in eight separate strings or groups. It provides the necessary functionality to drive and control the LEDs, such as adjusting brightness, setting color, and implementing various lighting effects.

These controllers are commonly used in applications where precise control and synchronization of multiple LEDs are required, such as architectural lighting, stage lighting, automotive lighting, and large-scale LED displays.

The specific features and capabilities of an eight-string high-power LED controller can vary depending on the manufacturer and model. Some common features may include:

1. PWM (Pulse Width Modulation) control: Allows for precise control of the LED brightness levels by varying the duty cycle of the PWM signal.

2. Multiple LED channels or strings: Supports independent control of each LED string, allowing for different colors or effects in each group.

3. Current regulation: Ensures consistent current flow through each LED string to maintain uniform brightness and prevent damage to the LEDs.

4. Dimming and color mixing: Enables smooth dimming and color blending of the LEDs to create dynamic lighting effects.

5. Communication interface: May include options such as UART, I2C, or SPI for external control and integration with other systems.

OZ9998, OZ999898A are high effi ciency, DC/DC controllers that drive up to eight (8) strings of LEDs connected in parallel confi guration, with multiple LEDs in each string connected in series. They provide eight (8) 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. OZ9998 / OZ99988A support external Pulse Width Modulation (PWM) dimming control. Plus, each provides an integrated circuit to balance the current fl ow through each LED string.

Pinouts:

oz9998 schematic

Features:

• OZ9998: Up to 60mA per ISEN channel
• OZ9998A: Up to 80mA per ISEN channel
• High power DC/DC boost converter controller
• Drives up to 8 strings in parallel
• Integrated LED current balance control circuit
• User-defi ned string selection
• External PWM dimming control
• Time-shift PWM phase dimming control for low audible noise
• Multi-chip parallel operation for more than 8 LED strings
• MOSFET over-current protection
• LED short circuit and open string protection
• Thermal protection
• LED fault status output

Application:

• LCD Monitor
• LCD TV

controller

OB3350 Schematic – OB3350CP Equivalent

OB3350 Datasheet File

OZ9998 LED Controller – O2Micro, 0Z9998

OZ9998 PDF Datasheet File