Datasheet A80601, A80601-1 (Allegro) - 3

link to page 1 link to page 1 link to page 1 link to page 1 link to page 2 link to page 2 link to page 2 link to page 3 link to page 4 link to page 5 link to page 6 link to page 11 link to page 11 link to page 12 link to page 14 link to page 14 link to page 15 link to page 15 link to page 16 link to page 17 link to page 17 link to page 18 link to page 18 link to page 19 link to page 20 link to page 20 link to page 21 link to page 22 link to page 23 link to page 24 link to page 24 link to page 24 link to page 25 link to page 25 link to page 27 link to page 28 link to page 29 link to page 30 link to page 31 link to page 31 link to page 31 link to page 34 link to page 35
A80601 and High Power LED Driver with Pre-Emptive Boost A80601-1 for Ultra-High Dimming Ratio and Low Output Ripple Table of Contents
Features and Benefits ... 1 LED Current Setting .. 18 Description .. 1 PWM Dimming ... 18 Applications ... 1 Pre-Emptive Boost (PEB) ... 19 Package ... 1 Analog Dimming ... 20 Selection Guide ... 2 ADIM Mode .. 20 Absolute Maximum Ratings ... 2 APWM Mode .. 21 Thermal Characteristics .. 2 Extending LED Dimming Ratio.. 22 Typical Application – SEPIC .. 3 Analog Dimming with External Voltage... 23 Functional Block Diagram ... 4 VDD .. 24 Pinout Diagram and Terminal List ... 5 VDRV .. 24 Electrical Characteristics ... 6 Shutdown... 24 Functional Description ...11 Fault Detection and Protection ... 25 Enabling the IC ..11 FAULT Status ... 25 Powering Up: LED Detection Phase .. 12 LED String Partial-Short Detect .. 27 Powering Up: Boost Output Undervoltage .. 14 Overvoltage Protection .. 28 Soft Start Function .. 14 Boost Switch Overcurrent Protection ... 29 Frequency Selection .. 15 Input Overcurrent Protection and Disconnect Switch ... 30 Synchronization .. 15 Setting the Input Current Sense Resistor ... 31 Loss of External Sync Signal .. 16 Input UVLO .. 31 Switching Frequency Dithering ... 17 Fault Protection During Operation ... 31 Clock Out Function.. 17 Package Outline Drawing .. 34 Appendix: External MOSFET Selection Guide ... 35 L2 Breakdown voltage of Q1 and D1 must be > V V IN + VOUT IN D1 VOUT ≤ 40 V L1 CC CIN Q1 ROVP C C OUT1 COUT2 DRV GATE VDRV GDRV CS PGND Vsense VC VIN OVP CVDD RPU VDD LED1 FAULT
A80601
LED2 Up to 11 WLEDs in series Up to 210 mA/ch. Combine Enable EN LED3 to drive up to 840 mA total PWM LED4 PWM ton ≥ 0.3 µs ADIM i CLKOUT LED COMP 100% AGND ISET FSET DITH PEB ADIM RZ CP R R DITH ISET R R FSET C PEB CZ DITH APWM 100kHz 0-90%
Figure 2: A80601 in SEPIC configuration where VOUT can be either higher or lower than VIN
Allegro MicroSystems, LLC 3 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Document Outline Features and Benefits Description Applications Package Selection Guide Absolute Maximum Ratings Thermal Characteristics Typical Application – SEPIC Functional Block Diagram Pinout Diagram and Terminal List Electrical Characteristics Functional Description Enabling the IC Powering Up: LED Detection Phase Powering Up: Boost Output Undervoltage Soft Start Function Frequency Selection Synchronization Loss of External Sync Signal Switching Frequency Dithering Clock Out Function LED Current Setting PWM Dimming Pre-Emptive Boost (PEB) Analog Dimming ADIM Mode APWM Mode Extending LED Dimming Ratio Analog Dimming with External Voltage VDD VDRV Shutdown Fault Detection and Protection FAULT Status LED String Partial-Short Detect Overvoltage Protection Boost Switch Overcurrent Protection Input Overcurrent Protection and Disconnect Switch Setting the Input Current Sense Resistor Input UVLO Fault Protection During Operation Package Outline Drawing Appendix: External MOSFET Selection Guide