參數(shù)資料
型號： GP3843
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> 1314K
代理商： GP3843
CORPORATION
1/9
ISSUED DATE :2004/04/19
REVISED DATE :2004/09/30B
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G P
P 33884433
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H II G
G H
H P
P E
E R
R F
F O
O R
R M
M A
A N
N C
C E
E C
C U
U R
R R
R E
E N
N T
T M
M O
O D
D E
E C
C O
O N
N T
T R
R O
O L
L E
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R S
S
Description
The GP3843 is specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with
minimal external components.
The GP3843 has UVLO thresholds 8.5V(on) and 7.6V(off),ideally suited for off-line converters.
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
Current sense and voltage feedback inputs
Vin
-0.3 to 5.5
V
L
A
SEATING PLANE
e
b
Z
E
D
c
SECTION Z - Z
b
GAUGE PLANE
DIP-8
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