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HT7938 датащи(PDF) 3 Page - Holtek Semiconductor Inc

номер детали HT7938
подробное описание детали  High Current and Performance White LED Driver
PDF  11 Pages
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7938 датащи(HTML) 3 Page - Holtek Semiconductor Inc

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Electrical Characteristics
VIN=3.6V, L=10
mH, CIN=1mF, CO=1mF, ILED=20mA, Ta=25°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VIN
Input Voltage
¾
2.6
¾
5.5
V
ULVO
Under Voltage Lockout
¾¾
2.4
2.5
V
IIN
Supply Current
Switching, VFB=GND
¾
1.0
2.5
mA
VEN=0V
¾
0.1
1.0
mA
Not switching, VFB=0.25V
¾
200
300
mA
Error Amplifier
VFB
Feedback Voltage
¾
190
200
210
mV
Power Switch
fOSC
Switching Frequency
Measurement at SW pin
0.8
1.2
1.6
MHz
DC
Maximum Duty Cycle
92
95
¾
%
RDS(ON)
SW On Resistance
¾¾
0.7
¾W
ISW(OFF)
Switch Leakage Current
¾¾
0.1
1.0
mA
EN Pin
VIH
EN Voltage High
VIN=2.6V~5.5V
2.0
¾¾
V
VIL
EN Voltage Low
VIN=2.6V~5.5V
¾¾
0.8
V
OVP and OCP
VOVP
OVP Threshold
No load
36
39
42
V
IOCP
N-channel MOSFET Current Limit
¾¾
650
¾
mA
Thermal Shutdown
TSHUT
Thermal Shutdown Threshold
¾¾
150
¾°C
Thermal Shutdown Hysteresis
¾¾
15
¾°C
HT7938
Rev 1.10
3
March 19, 2010



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