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HT7937 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

No. de pieza HT7937
Descripción Electrónicos  Built-in OVP White LED Step-up Converter
PDF  13 Pages
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Fabricante Electrónico  HOLTEK [Holtek Semiconductor Inc]
Página de inicio  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7937 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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Electrical Characteristics
VSHDN=3V; VIN=3V; Ta=25
°C (Unless otherwise specified)(Note)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VIN
Input Voltage
¾
2.5
3
5.5
V
IIN
Supply Current
Switching
¾
1.0
1.25
mA
Non-switching
¾
50
100
mA
VSHDN=0V
¾
0.1
1
mA
VFB
Feedback Voltage
3 LEDs
85
95
105
mV
fOSC
Switching Frequency
Measurement at SW pin
0.8
1.2
1.6
MHz
DC
Maximum Duty Cycle
85
90
¾
%
RDS(ON)
SW On Resistance
¾¾
1.4
5
W
ISW(OFF)
Switch Leakage Current
¾¾
0.1
1
mA
VIH
SHDN Voltage High
¾
1.5
¾¾
V
VIL
SHDN Voltage Low
¾¾
¾
0.3
V
VOVP
OVP Threshold
No load
23
28
33
V
Note:
Specifications are production tested at Ta=25 degree. Specifications over
-40 to 85 degree operating
temperature range are assured by design, characterization.
HT7937
Rev 1.10
3
January 18, 2010



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