Wide Input Voltage Range, High-Efficiency,
Fault-Tolerant LED Driver
A8518 and A8518-1
ELECTRICAL CHARACTERISTICS [1]: Unless otherwise noted, specifications are valid at VIN = 16 V, TA = 25°C, • indicates specifica-
tions guaranteed over the full operating temperature range with TA = TJ = –40°C to 125°C, typical specifications are at TA = 25°C
Characteristic
INPUT VOLTAGE
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Input Voltage Range [3]
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
VIN
●
●
●
4.5
–
–
–
40
4.35
3.9
V
V
VUVLOrise
VUVLOfall
VUVLOHYS
VIN rising
VIN falling
–
–
V
300
450
600
mV
INPUT SUPPLY CURRENT
Input Quiescent Current
Input Sleep Supply Current
INPUT LOGIC LEVELS (PWM, APWM)
Input Logic Level Low
IQ
VPWM = VIH, fSW = 2 MHz
VIN = 16 V, VPWM = 0 V
●
●
–
–
8
2
15
10
mA
µA
ISLEEP
VIL
VIH
●
●
–
–
0.4
–
V
V
Input Logic Level High
PWM Input Pull-Down Resistor
APWM Input Pull-Down Resistor
APWM
1.5
60
60
–
REN
VPWM = 5 V
VPWM = VIH
100
100
140
140
kΩ
kΩ
RAPWM
APWM Frequency [2]
fAPWM
●
40
–
1000
kHz
ERROR AMPLIFIER
Source Current
IEA(SRC)
IEA(SINK)
RCOMP
VCOMP = 1.5 V
–
–
–
–600
+600
1.4
–
–
–
μA
μA
kΩ
Sink Current
VCOMP = 1.5 V
COMP Pin Pull-Down Resistance
OVERVOLTAGE PROTECTION
OVP Pin Voltage Threshold
OVP Pin Sense Current Threshold
OVP Pin Leakage Current
OVP Accuracy
FAULT = 0, VCOMP = 1.5V
VOVP(th)
IOVP(th)
OVP pin connected to VOUT
Current into OVP pin
●
●
●
7
190
–
8.3
200
0.1
–
9.5
210
1
V
μA
μA
%
V
IOVP(LKG)
VIN = 16 V, PWM = L
–
5
Measured at VOUT pin when ROVP = 160 kΩ [2]
Measured at VOUT pin when ROVP = 0
Measured at SW pin
–
3
–
Undervoltage Protection Threshold
VUVP(th)
–
0.55
45
0.7
48
V
Secondary Overvoltage Protection
BOOST SWITCH
VOVP(sec)
●
42
V
Switch On-Resistance
Switch Leakage Current
Switch Current Limit
RSW
ISW = 0.750 A, VIN = 16 V
VSW = 16 V, VPWM = VIL
●
●
●
100
–
250
0.1
500
1
mΩ
μA
A
ISW(LKG)
ISW(LIM)
3
3.65
4.5
Higher than max ISW(LIM) under all conditions
part latches when detected
Secondary Switch Current Limit [2]
ISW(LIM2)
~
4.9
–
A
Minimum Switch On-Time
Minimum Switch Off-Time
tSW(on)
tSW(off)
●
●
45
–
65
65
85
85
ns
ns
Continued on the next page…
1 For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing); positive current is defined as going into the node or pin
(sinking).
2 Ensured by design and characterization, not production tested.
3 Minimum VIN = 4.5 V is only required at startup. After startup is completed, IC can continue to operate down to VIN = 3.9 V.
4 LED current is trimmed to cancel variations in both Gain and ISET voltage.
Allegro MicroSystems, LLC
115 Northeast Cutoff
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5秒后页面跳转
资料手册解读：UC3842参数和管脚说明
一文带你了解无源晶振的负载电容为何要加两颗谐振电容CL1和CL2
玻璃管保险丝与陶瓷管保险丝：区别与替代性探讨
PCF8574资料解读：主要参数分析、引脚说明
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
