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HT7939A bảng dữ liệu(PDF) 3 Page - Holtek Semiconductor Inc

tên linh kiện HT7939A
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
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HT7939A bảng dữ liệu(HTML) 3 Page - Holtek Semiconductor Inc

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Rev. 1.00
3
April 19, 2012
HT7939A
Absolute Maximum Ratings
InputVoltage,FBVoltage,EN............................6.0V
SWVoltage...........................................................36V
OVPVoltage.........................................................36V
OperatingTemperatureRange.......... -40°Cto+85°C
StorageTemperatureRange............ -55°Cto+150°C
MaximumJunctionTemperature..................... 150°C
Note:Thesearestressratingsonly.StressesexceedingtherangespecifiedunderAbsoluteMaximumRatingsmay
causesubstantialdamagetothedevice.Functionaloperationofthisdeviceatotherconditionsbeyondthose
listedinthespecificationisnotimpliedandprolongedexposuretoextremeconditionsmayaffectdevice
reliability.
Electrical Characteristics
VIN=5.0V,Ta=25°C,unlessotherwisespecified(note1)
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
―
190
200
210
mV
V
Line Regulation
VIN= 3.0V~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
85
90
―
%
RDS(ON)
SW ON Resistance
―
―
0.5
―
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%
100
―
200
kHz
OVP and OCP
VOVP
OVP Threshold
No Load, for 39A-1 Marking
15.8
17.6
19.4
V
No Load, for 39A-2 Marking
28.8
32.0
35.2
V
IOCP
N-channel MOSFET Current limit
―
―
1200
―
mA
Thermal Shutdown
tSHUT
Thermal Shutdown Threshold
―
―
150
―
°C
Thermal Shutdown Hysteresis
―
―
25
―
°C
Note1.SpecificationsareproductiontestedatTa=25degree.Specificationsover-40°Cto85°Cdegreeoperating
temperaturerangeareassuredbydesign,characterization.



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