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參數(shù)資料
| 型號： | GSC3842 |
| 廠商： | GTM CORPORATION |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE CONTROLERS |
| 中文描述： | 高性能電流模式CONTROLERS |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 1230K |
| 代理商： | GSC3842 |
GSC3842
Page: 1/9
ISSUED DATE :2003/05/20
REVISED DATE :2005/10/05C
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C 33884422
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G H
H P
P E
E R
R F
F O
O R
R M
M A
A N
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C E
E C
C U
U R
R R
R E
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N T
T M
M O
O D
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E C
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Description
The GSC3842 is high performance fixed frequency current mode controllers. This is specifically designed for Off-Line and DC To DC
converter applications offering the designer a cost-effective solution with minimal external components.
These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain Error
amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also Included are
protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting,
programmable output deadtime, and latch for single pulse metering.
Features
*Trimmed Oscillator for Precise Frequency Control
*Oscillator Frequency Guaranteed at 250kHz
*Current Mode Operation to 500kHz
*Automatic Feed Forward Compensation
*latching PWM for Cycle-By-Cycle Current Limiting
*Internally Trimmed Reference with Undervoltage Lockout
*High Current Totem Pole Output
*Undervoltage Lockout with Hysteresis
*Low Startup and Operating Current
Package Dimensions
Millimeter
REF.
Min.
Max.
REF.
Min.
Max.
A
5.80
6.20
M
0.10
0.25
B
4.80
5.00
H
0.35
0.49
C
3.80
4.00
L
1.35
1.75
D
0 C
8 C
J
0.375 REF.
E
0.40
0.90
K
45 C
F
0.19
0.25
G
1.27 TYP.
SOP-8L
Function
Description
Pin1:Compensation
This pin is the Error Amplifier output and is made available for loop
compensation.
Pin2:Voltage Feedback
This is the inverting input of the Error Amplifier. It’s normally connected to the
Switching power supply output through a resistor divider.
Pin3:Current Sense
A voltage proportional to inductor current is connected to this input .The
PWM uses this information to terminate the output switch conduction.
Pin4:RT/CT
The oscillator frequency and maximum output duty cycle are programmed by
connecting resistor RT to Vref and capacitor CT to ground .Operation 500kHz
is possible.
Pin5:Ground
This pin is the combined control circuitry and power ground.
Pin6:Output
This output directly drives the gate of a power MOSFET. Peak currents up to
1 A are sourced and sunk by this pin.
Pin7:Vcc
This pin is the positive supply of the control IC.
Pin8:Vref
This is the reference output .It provides charging current for capacitor CT
through resistor RT.
Absolute Maximum Ratings at Ta = 25 ::::
Parameter
Symbol
Value
Unit
Total power Supply and Zener current
(ICC+Iz)
30
mA
Output current, source or sink(note1)
Io
1.0
A
Output energy(capacitive load per cycle)
W
5.0
J
Current sense and voltage feedback inputs
Vin
-0.3 to 5.5
V
Error Amplifier Output Sink Current
Io
10
mA
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