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HT7938A Datenblatt(PDF) 3 Page - Holtek Semiconductor Inc

Teilenummer HT7938A
Bauteilbeschribung  Performance White LED Driver
PDF  13 Pages
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7938A Datenblatt(HTML) 3 Page - Holtek Semiconductor Inc

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Rev. 1.00
3
April 19, 2012
HT7938A
Note:Thesearestressratingsonly.StressesexceedingtherangespecifiedunderAbsoluteMaximumRatingsmay
causesubstantialdamagetothedevice.Functionaloperationofthisdeviceatotherconditionsbeyondthose
listedinthespecificationisnotimpliedandprolongedexposuretoextremeconditionsmayaffectdevice
reliability.
Electrical Characteristics
VIN= 3.6V, L=22mH, CIN=1mF, COUT=4.7mF, ILED=20mA, Ta=25°C, unless otherwise specified (Note 1)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Input Supply Voltage and Current
VIN
Input Voltage
―
2.6
―
5.5
V
UVLO
Under Voltage Lockout
―
1.8
2.1
2.4
V
IIN
Supply Current
Switching
―
1.0
5.0
mA
VEN=0
―
0.1
1.0
μA
Error Amplifier
VFB
Feedback Voltage
For 38A-2 Marking
190
200
210
mV
For 38A-3 Marking
285
300
315
mV
VLine
Line Regulation
VIN=3.0~4.3V, ILED=20mA
―
1.0
―
%
Power Switch
fOSC
Switching Frequency
Measured at SW Pin
0.8
1.2
1.6
MHz
DC
Maximum Duty Cycle
92
95
―
%
RDS(ON)
SW ON Resistance
―
―
0.7
―
Ω
ISW(OFF)
Switch Leakage Current
―
―
0.1
1.0
μA
Enable
VIH
EN Voltage High
―
2.0
―
―
V
VIL
EN Voltage Low
―
―
―
0.8
V
fEN
Dimming Clock Rate
Duty= 5%~100%
0.1
―
200
kHz
OVP and OCP
VOVP
OVP Threshold
No Load
36
39
42
V
IOCP
N-channel MOSFET Current limit
―
―
1000
―
mA
Thermal Shutdown
tSHUT
Thermal Shutdown Threshold
―
―
150
―
°C
Thermal Shutdown Hysteresis
―
―
25
―
°C
Note1.SpecificationsareproductiontestedatTa=25degree.Specificationsover-40°Cto85°Cdegreeoperating
temperaturerangeareassuredbydesign,characterization.
Absolute Maximum Ratings
InputVoltage.......................................................6.0V
SWVoltage...........................................................46V
FBVoltage...........................................................6.0V
EN.......................................................................6.0V
OVPVoltage.........................................................46V
OperatingTemperatureRange.......... -40°Cto+85°C
MaximumJunctionTemperature..................... 150°C



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