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A8502

更新时间： 2024-11-09 12:51:19
品牌 Logo 应用领域
急速微 - ALLEGRO /
页数 文件大小 规格书
35页 1247K
描述
Wide Input Voltage Range, High Efficiency

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A8502 数据手册

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A8502  
Wide Input Voltage Range, High Efficiency  
Fault Tolerant LED Driver  
Description  
Features and Benefits  
• AEC-Q100 qualified  
The A8502 is a multi-output white LED driver for small-size  
• Wide input voltage range of 5 to 40 V for start/stop, cold  
crank and load dump requirements  
• Fully integrated LED current sinks and boost converter  
with 60 V DMOS  
• Sync function to synchronize boost converter switching  
frequency up to 2.3 MHz, allowing operation above the  
AM band  
• Excellent input voltage transient response  
• Single resistor primary OVP minimizes VOUT leakage  
• Internal secondary OVP for redundant protection  
• LED current of 120 mA per channel  
• Drives up to 12 series LEDs in 2 parallel strings  
• 0.7% to 0.8% LED to LED matching accuracy  
• PWM and analog dimming inputs  
• 5000:1 PWM dimming at 200 Hz  
• Provides driver for optional external PMOS input  
disconnect switch  
• Extensive protection against:  
▫ Shorted boost switch or inductor  
▫ Shorted FSET or ISET resistor  
▫ Shorted output  
▫ Open or shorted LED pin  
▫ Open boost Schottky  
▫ Overtemperature (OTP)  
LCDbacklighting.Itintegratesacurrent-modeboostconverter  
with internal power switch and two current sinks. The boost  
converter can drive up to 24 LEDs, 12 LEDs per string, at  
120 mA. The LED sinks can be paralleled together to achieve  
even higher LED currents, up to 240 mA. The A8502 can  
operate with a single power supply, from 5 to 40 V, which  
allowstheparttowithstandloaddumpconditionsencountered  
in automotive systems.  
If required, the A8502 can drive an external P-FET to  
disconnect the input supply from the system in the event of  
a fault. The A8502 provides protection against output short  
and overvoltage, open or shorted diode, open or shorted LED  
pin, shorted boost switch or inductor, shorted FSET or ISET  
resistor, and IC overtemperature. A dual level cycle-by-cycle  
currentlimitfunctionprovidessoftstartandprotectstheinternal  
current switch against high current overloads.  
The A8502 has a synchronization pin that allows PWM  
switching frequencies to be synchronized in the range of  
580 kHz to 2.3 MHz. The high switching frequency allows  
the A8502 to operate above the AM radio band.  
Continued on the next page…  
Package: 16-pin TSSOP with exposed  
thermal pad (suffix LP)  
Applications:  
LCD backlighting or LED lighting for:  
▫ Automotive infotainment  
▫ Automotive cluster  
▫ Automotive center stack  
Not to scale  
Typical Application Circuit  
V
IN  
D1  
2 A / 60 V  
L1  
10 μH  
R
SC  
10 to 14 V  
V
OUT  
0.033 Ω  
Q1  
C
C
C
IN  
R
C
R
OVP  
22 nF  
4.7 μF  
C
OUT  
4.7 μF  
50 V  
R
249 Ω  
ADJ  
20 Ω  
137 kΩ  
50 V  
SW  
GATE  
VSENSE  
OVP  
V
C
VIN  
VDD  
A8502  
C
VDD  
100 kΩ  
0.1 μF  
PAD  
LED1  
FAULT  
PWM/EN  
APWM  
ISET  
LED2  
COMP  
R
Z
FSET/SYNC  
AGND  
C
P
120 pF  
R
ISET  
120 Ω  
R
10 kΩ  
FSET  
8.25 kΩ  
PGND  
C
Z
0.47 μF  
Figure 1. Application with VIN to ground short protection, using optional P-MOSFET sensing  
A8502-DS, Rev. 3  
1234567...35

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