Monolithic Power Systems MP3389
The MP3389 is a step-up controller with 12channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications. The MP3389 uses current mode, fixed frequency architecture. The switching frequency is programmable by an external frequency setting resistor.| Part No. | MP3389 |
|---|---|
| Datasheet | MP3389 Download |
| Manufacturer |  Monolithic Power Systems |
| Description | Step-up White LED Driver |
| Buy | Stock & Price |
DESCRIPTION
It drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. The MP3389 regulates the current in each LED string to the programmed value set by an external current setting resistor. The MP3389 applies 12 internal current sources for current balance. And the current matching can achieve 2.5% regulation accuracy between strings. Its low 550mV regulation voltage on LED current sources reduces power loss and improves efficiency. PWM dimming is implemented with external PWM input signal or DC input signal. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor. TYPICAL APPLICATION VIN 5V~28V CIN M1 L1 Enable DIMMING CVCC 2 VIN 3 VCC C R COMP COMP 4 COMP VFAULT 27 26 GAT E 24 ISENSE 5 EN NC 28 R OSC VCC RBOSC 8 OSC PGND 25 1 NC 23 OVP 10 BOSC 22 LED1 C BOSC MP3389 7 GND LED2 21 RSET 6 DBRT 9 ISET LED3 20 19 LED4 11 LED12 18 LED5 12 LED11 17 LED6 13 LED10 LED7 16 14 LED9 15 LED8 D1...
