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參數(shù)資料
| 型號： | GP3842 |
| 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> | 1212K |
| 代理商： | GP3842 |
1/9
ISSUED DATE :2003/05/20
REVISED DATE :2004/09/30B
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P 33884422
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A N
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C U
U R
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R E
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N T
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Description
The GP3842 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
-
0.5334
c1
0.203
0.279
A1
0.381
-
D
9.017
10.16
A2
2.921
4.953
E
6.096
7.112
b
0.356
0.559
E1
7.620
8.255
b1
0.356
0.508
e
2.540 BSC
b2
1.143
1.778
HE
-
10.92
b3
0.762
1.143
L
2.921
3.810
c
0.203
0.356
DIP-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
L
A
SEATING PLANE
e
b
Z
E
D
c
SECTION Z - Z
b
GAUGE PLANE
DIP-8
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