Datasheet A80601, A80601-1 (Allegro) - 10
| Manufacturer | Allegro |
| Description | High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple |
| Pages / Page | 37 / 10 — A80601 and. High Power LED Driver with Pre-Emptive Boost. A80601-1 for … |
| File Format / Size | PDF / 5.0 Mb |
| Document Language | English |
A80601 and. High Power LED Driver with Pre-Emptive Boost. A80601-1 for Ultra-High Dimming Ratio and Low Output Ripple
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A80601 and High Power LED Driver with Pre-Emptive Boost A80601-1 for Ultra-High Dimming Ratio and Low Output Ripple
VIN D1 VOUT ≤ 40 V L1 C Q1 IN R C OVP1 OUT ROVP2 CVDRV VIN GATE GDRV PGND GATE GDRV PGND VSENSE VDRV CS VSENSE VDRV CS V OVP C C VIN OVP CVDD VIN VDRV VDD VDD RPU LED1
A80601-1
LED1
A80601-1 (MASTER)
FAULT LED2
(SLAVE)
FAULT LED2 LED3 EN LED3 EN LED4 PWM LED4 PWM Up to 210 mA × 4 Up to 210 mA × 4 ADIM ADIM COMP CLKOUT COMP CLKOUT AGND ISET FSET DITH PEB AGND ISET FSET DITH PEB RZ CP R RDITH R R R ISET R PEB1 ISET RFSET PEB FSET C CZ DITH
Figure 5: Two A80601-1 connected in Master/Slave Configuration to drive 210 mA × 8 LED strings Remarks on Master-Slave configuration:
• Only one Slave to a Master. • Master-Slave operation requires asymmetrical COMP (for example: source = –700 µA and sink = 500 µA). This is available in A80601-1 only. • Also requires bidirectional FAULT pin of A80601-1, so that the slave can halt the switching of master. Allegro MicroSystems, LLC 10 955 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
VIN D1 VOUT ≤ 40 V L1 C Q1 IN R C OVP1 OUT ROVP2 CVDRV VIN GATE GDRV PGND GATE GDRV PGND VSENSE VDRV CS VSENSE VDRV CS V OVP C C VIN OVP CVDD VIN VDRV VDD VDD RPU LED1
A80601-1
LED1
A80601-1 (MASTER)
FAULT LED2
(SLAVE)
FAULT LED2 LED3 EN LED3 EN LED4 PWM LED4 PWM Up to 210 mA × 4 Up to 210 mA × 4 ADIM ADIM COMP CLKOUT COMP CLKOUT AGND ISET FSET DITH PEB AGND ISET FSET DITH PEB RZ CP R RDITH R R R ISET R PEB1 ISET RFSET PEB FSET C CZ DITH
Figure 5: Two A80601-1 connected in Master/Slave Configuration to drive 210 mA × 8 LED strings Remarks on Master-Slave configuration:
• Only one Slave to a Master. • Master-Slave operation requires asymmetrical COMP (for example: source = –700 µA and sink = 500 µA). This is available in A80601-1 only. • Also requires bidirectional FAULT pin of A80601-1, so that the slave can halt the switching of master. Allegro MicroSystems, LLC 10 955 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
