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A8431 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - White LED Driver Constant Current Step-up Converter - Allegro MicroSystems

भाग संख्या A8431
समारोह White LED Driver Constant Current Step-up Converter
मैन्युफैक्चरर्स Allegro MicroSystems 
लोगो Allegro MicroSystems लोगो 
पूर्व दर्शन
1 Page
		
<?=A8431?> डेटा पत्रक पीडीएफ

A8431 pdf
Preliminary Data Sheet
Subject to Change Without Notice
April 5, 2005
A8431
White LED Driver Constant Current Step-up Converter
Functional Block Diagram
FB
SW
VIN VREF
1.25 V
95 mV
A1
OVP
OVP
EN
Enable
A2
RC
CC
Σ
Ramp
Generator
1.2 MHz
Oscillator
RQ
S
Driver
GND
ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V (unless otherwise noted)
Characteristics
Symbol
Test Conditions
Min.
Input Voltage Range
Supply Current
VIN
Active
ISUP Shutdown (EN = 0 V)
2.5
Feedback Reference Voltage
Feedback Input Current
Switch Current Limit
Switch Frequency
Switch Maximum Duty Cycle
VFB
IFB
ISWLIM
FSW
D
86
0.8
85
Switch Saturation Voltage
Switch Leakage Current
Enable Input
VCE(SAT)
ISL
VSW = 5 V
Input Threshold Low
Input Threshold High
Input Leakage
Overvoltage Protection
VIL
VIH
Leakage
IIL
1.5
Output Overvoltage Rising Limit
Output Overvoltage Falling Limit
Output Overvoltage Hysteresis
OVP Pin Resistance
VOVPR
VOVPF
VOVPHYS
ROVP
28
27.5
Typ.
2.5
0.1
95
20
300
1.2
90
350
32
31.5
0.5
1.0
Max.
10
3.5
1
104
75
1.6
5
0.4
1
35
34.5
Units
V
mA
µA
mV
nA
mA
MHz
%
mV
µA
V
V
µA
V
V
V
M
Note 1. Measured with 4-layer PCB. Please refer to application note “Package Thermal Characteristics,“ for thermal perfor-
mance measurement for 2 x 3 mm MLP package for additional information.
26185.301
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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डाउनलोड[ A8431 Datasheet.PDF ]


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