Datasheet A80603, A80603-1 (Allegro) - 4
| Manufacturer | Allegro |
| Description | LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple |
| Pages / Page | 30 / 4 — A80603 and. LED Driver with Pre-Emptive Boost. A80603-1 for Ultra-High … |
| File Format / Size | PDF / 4.6 Mb |
| Document Language | English |
A80603 and. LED Driver with Pre-Emptive Boost. A80603-1 for Ultra-High Dimming Ratio and Low Output Ripple. A80603
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A80603 and LED Driver with Pre-Emptive Boost A80603-1 for Ultra-High Dimming Ratio and Low Output Ripple
V VOUT SENSE External L1 SYNC C R DITH FSET RDITH GATE FSET/SYNC SW DITH CLKOUT active as Oscillator long as EN=H Frequency CLKOUT dithering VDD Clock Out Buffer NMOS fSW NMOS FET Gate COMP Drive Comparator Boost COMP Enable Rsense PGND Soft Start Current CCOMP Ramp PGND sense VLED (8/16 ms) ref 1 MHz ÷4 LED1 4 MHz Multi-input . Error Amp . System OCP2 TSD LED4 Oscillator VOUT VDD FSET or ISET Internal VDD pin Open/Short (4.25 V) CVDD Rovp VIN Regulator OVP 1.235 V UVLO Block REF Vref sense OVP AGND Fault Block RSC Enable Open/Short + LED Detect VSENSE Input current sense amp i Chopping ADJ Frequency LED1 4 MHz LED VIN LED2 On/Off Driver GATE GATE Boost Block LED3 OFF Enable Current PMOS level LED4 Driver AGND Enable APWM Int VDD ISET EN ISET Vref Keep-Alive Block R 1 MHz Timer ISET 100 kΩ External PWM VDD PWM LED Enable RPU 100 kΩ start Pre-Emptive PEB Boost FAULT Internal FAULT delay RPEB
A80603
AGND
Figure 3: Functional Block Diagram
Allegro MicroSystems, LLC 4 955 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 with APWM Pin Extending LED Dimming Ratio Analog Dimming with External Voltage VDD Shutdown Fault Detection and Protection LED String Partial-Short Detect Overvoltage Protection Boost Switch Overcurrent Protection Input Overcurrent Protection and Disconnect Switch Setting the Current Sense Resistor Input UVLO Fault Protection During Operation Fault Recovery Mechanism Package Outline Drawing
V VOUT SENSE External L1 SYNC C R DITH FSET RDITH GATE FSET/SYNC SW DITH CLKOUT active as Oscillator long as EN=H Frequency CLKOUT dithering VDD Clock Out Buffer NMOS fSW NMOS FET Gate COMP Drive Comparator Boost COMP Enable Rsense PGND Soft Start Current CCOMP Ramp PGND sense VLED (8/16 ms) ref 1 MHz ÷4 LED1 4 MHz Multi-input . Error Amp . System OCP2 TSD LED4 Oscillator VOUT VDD FSET or ISET Internal VDD pin Open/Short (4.25 V) CVDD Rovp VIN Regulator OVP 1.235 V UVLO Block REF Vref sense OVP AGND Fault Block RSC Enable Open/Short + LED Detect VSENSE Input current sense amp i Chopping ADJ Frequency LED1 4 MHz LED VIN LED2 On/Off Driver GATE GATE Boost Block LED3 OFF Enable Current PMOS level LED4 Driver AGND Enable APWM Int VDD ISET EN ISET Vref Keep-Alive Block R 1 MHz Timer ISET 100 kΩ External PWM VDD PWM LED Enable RPU 100 kΩ start Pre-Emptive PEB Boost FAULT Internal FAULT delay RPEB
A80603
AGND
Figure 3: Functional Block Diagram
Allegro MicroSystems, LLC 4 955 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 with APWM Pin Extending LED Dimming Ratio Analog Dimming with External Voltage VDD Shutdown Fault Detection and Protection LED String Partial-Short Detect Overvoltage Protection Boost Switch Overcurrent Protection Input Overcurrent Protection and Disconnect Switch Setting the Current Sense Resistor Input UVLO Fault Protection During Operation Fault Recovery Mechanism Package Outline Drawing
