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ISL97671 Datasheet PDF : 28 Pages
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ISL97671
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 ...........................................................10
OVP and VOUT Requirement .............................. 10
Current Matching and Current Accuracy ............. 11
Dynamic Headroom Control .............................. 11
Dimming Controls ........................................... 11
Maximum DC Current Setting . . . . . . . . . . . . . . . . . . 11
PWM Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PWM Dimming Frequency Adjustment ................ 12
Phase Shift Control.......................................... 12
Switching Frequency........................................13
5V Low Dropout Regulator................................ 13
In-rush Control and Soft-start........................... 14
Fault Protection and Monitoring ......................... 14
Short Circuit Protection (SCP) ........................... 14
Open Circuit Protection (OCP) ........................... 14
Overvoltage Protection (OVP) ........................... 15
Undervoltage Lock-out ..................................... 15
Input Overcurrent Protection............................ 15
Over-Temperature Protection (OTP) .................. 15
SMBus/I2C Communications ................................ 18
Write Byte ......................................................... 18
Read Byte ......................................................... 18
Slave Device Address.......................................... 18
SMBus/I2C Register Definitions......................... 18
PWM Brightness Control Register (0x00)............ 20
Device Control Register (0x01)......................... 21
Fault/Status Register (0x02) ............................ 22
Identification Register (0x03) ........................... 22
DC Brightness Control Register (0x07) .............. 23
Configuration Register (0x08) .......................... 23
Output Channel Mask/Fault Readout
Register (0x09) ............................................ 24
Phase Shift Control Register (0x0A) .................. 25
Components Selections ................................... 25
Input Capacitor .............................................. 25
Inductor ........................................................ 25
Output Capacitors........................................... 26
Output Ripple................................................. 26
Schottky Diode............................................... 26
Applications .................................................... 26
High Current Applications ................................ 26
Multiple Drivers Operation ............................... 27
16-Bit Dimming.............................................. 27
Revision History .............................................. 27
Products.......................................................... 27
Package Outline Drawing ................................ 28
4
FN7631.0
June 24, 2010
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