ISL97675 Просмотр технического описания (PDF) - Intersil

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ISL97675

4-Channel LED Driver with Phase Shift Control

Intersil 

ISL97675

Table of Contents

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

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

Pin Descriptions (I = Input, O = Output, S = Supply) .......................................................................... 3

Absolute Maximum Ratings ................................................................................................................. 6

Thermal Information ........................................................................................................................... 6

Operating Conditions ........................................................................................................................... 6

Electrical Specifications ....................................................................................................................... 6

Typical Performance Curves ................................................................................................................ 9

Theory of Operation........................................................................................................................... 12

PWM Boost Converter ....................................................................................................................... 12

OVP ............................................................................................................................................... 12

Enable ............................................................................................................................................ 12

Power Sequence .............................................................................................................................. 12

Current Matching and Current Accuracy .............................................................................................. 12

Dynamic Headroom Control ............................................................................................................... 12

Dimming Controls ............................................................................................................................ 12

Maximum DC Current Setting ............................................................................................................ 12

PWM Control.................................................................................................................................... 13

Phase Shift Control........................................................................................................................... 13

PWM Dimming Frequency Adjustment ................................................................................................. 14

Direct PWM Dimming ........................................................................................................................ 14

Switching Frequency......................................................................................................................... 14

Inrush Control and Soft-Start ............................................................................................................ 14

Fault Protection and Monitoring .......................................................................................................... 15

Short Circuit Protection (SCP) ............................................................................................................ 15

Open Circuit Protection (OCP) ............................................................................................................ 15

Overvoltage Protection (OVP) ............................................................................................................ 15

Undervoltage Lockout ....................................................................................................................... 15

Master Fault Protection ..................................................................................................................... 15

Over-Temperature Protection (OTP).................................................................................................... 15

Components Selections ..................................................................................................................... 17

Input Capacitor................................................................................................................................ 17

Inductor ......................................................................................................................................... 18

Output Capacitors ............................................................................................................................ 18

Channel Capacitor ............................................................................................................................ 18

Output Ripple .................................................................................................................................. 18

Schottky Diode ................................................................................................................................ 18

Applications....................................................................................................................................... 19

High Current Applications .................................................................................................................. 19

Revision History ................................................................................................................................ 19

Products ............................................................................................................................................ 19

Package Outline Drawing .................................................................................................................. 20

5

FN7630.0

May 19, 2010

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