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ISL97674

6-Channel LED Driver with Phase Shift Control and Frame Rate to Dimming Frequency Synchronization

Intersil 

ISL97674

Table of Contents

Typical Application Circuit ................................. 1

Block Diagram ................................................... 2

Pin Descriptions (I = Input, O = Output,

S = Supply)..................................................... 3

Absolute Maximum Ratings . . . . . . . . . . . . . . . . 5

Thermal Information . . . . . . . . . . . . . . . . . . . . . 5

Operating Conditions . . . . . . . . . . . . . . . . . . . . . 5

Electrical Specifications . . . . . . . . . . . . . . . . . . . 5

Typical Performance Curves .............................. 8

Theory of Operation......................................... 10

PWM Boost Converter ...................................... 10

Enable and PWM ............................................. 10

Current Matching and Current Accuracy ............. 10

Dynamic Headroom Control .............................. 11

Dimming Controls ........................................... 11

Maximum DC Current Setting . . . . . . . . . . . . . . . . . . 11

DC Current Adjustment . . . . . . . . . . . . . . . . . . . . . . . 11

PWM Control................................................... 11

Phase Shift Control . . . . . . . . . . . . . . . . . . . . . . . . . . 12

VSYNC Frame Rate to Dimming Synchronization ... 13

Switching Frequency........................................13

5V Low Dropout Regulator................................ 13

In-rush Control and Soft-Start .......................... 13

Fault Protection and Monitoring ......................... 13

Short Circuit Protection (SCP) ........................... 14

Open Circuit Protection (OCP) ........................... 14

Overvoltage Protection (OVP) ........................... 14

Undervoltage Lockout ..................................... 14

Input Overcurrent Protection............................ 14

Over-Temperature Protection (OTP) .................. 14

Write Byte ......................................................... 17

Read Byte ......................................................... 17

Slave Device Address.......................................... 17

SMBus/I2C Register Definitions......................... 17

PWM Brightness Control Register (0x00)............ 19

Device Control Register (0x01)......................... 20

Fault/Status Register (0x02) ............................ 20

Si Revision Register (0x03) .............................. 20

DC Brightness Control Register (0x07) .............. 22

Configuration Register (0x08) .......................... 22

Output Channel Select and Fault Readout

Register (0x09) ............................................ 22

Phase Shift Control Register (0x0A) .................. 24

PLL Control Register (0x0B) ............................. 24

Components Selections ................................... 24

Input Capacitor .............................................. 24

Inductor ........................................................ 25

Output Capacitors........................................... 25

Channel Capacitor .......................................... 25

Output Ripple................................................. 25

Schottky Diode............................................... 26

Applications .................................................... 26

High Current Applications ................................ 26

Multiple Drivers Operation ............................... 26

Revision History .............................................. 27

Products.......................................................... 27

Package Outline Drawing ................................ 28

4

FN7634.0

June 25, 2010

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