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參數資料
| 型號： | GM3843AD8T |
| 廠商： | American Power Management Inc. |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| 中文描述： | 高性能電流模式PWM控制器 |
| 文件頁數： | 1/19頁 |
| 文件大小： | 304K |
| 代理商： | GM3843AD8T |
Description
GM384XA series is high performance with fixed-frequency
current mode PWM controllers. They are specially de-
signed for off-Line and DC-to-DC converter applications.
They require minimal external components to precisely tai-
lor performance in a wide variety of applications.
GM384XA series includes a trimmed oscillator for precise
duty cycle control, a temperature-compensated reference,
high gain error amplifier, a current-sensing comparator,
and a high-current totem pole output for driving a power
MOSFET.
On-chip protection features include undervoltage lockouts
with hysteresis for both input and reference, cycle-by-cycle
current limiting, programmable output deadtime, and a
latch for single pulse metering. All these are in a simple
DIP-8 or SOP-8 package!
GM3842A and GM3844A have UVLO thresholds of 16V
(on)/10V(off); GM3843A and GM3845A have UVLO thresh-
olds of 8.4V (on)/ 7.6V (off). GM3842A and GM3843A oper-
ate within 100% duty cycle; GM3844A and GM3845A oper-
ate within 50% duty cycle.
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Features
Low Start-Up and Operating Current
Automatic Feed Forward Compensation
Current Mode Operating Frequency up to
500kHz
Trimmed Oscillator Discharge Current for
Precise Duty Cycle Control
Latching PWM for Cycle-By-Cycle Current
Limiting
Undervoltage Lockout with Hysteresis
High Current Totem Pole Output
The GM384XA Have Start-up Current 0.17mA
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www.gammamicro.com
1
SIMPLIFIED BLOCK DIAGRAM
1
2
4
8
5
6
7
3
5
7
+
-
Error
Amplifier
R
5.0V
REFERENCE
VCC
Undervoltage
LOCKOUT
VREF
Undervoltage
LOCKOUT
OSCILLATOR
Latching
PWM
V
CC
V
C
Output
Power Ground
Current Sense Input
V
ref
R/ C
T
Voltage Feedback Input
Output Compensation
GND
V
1
.0
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| GM3843AS8R | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
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| GM431AST23R | 2.5V ADJUSTABLE SHUNT REGULATOR |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| GM3843AS8R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:CURRENT MODE PWM CONTROLLER |
| GM3843AS8T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| GM3844A | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| GM3844AD8T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:CURRENT MODE PWM CONTROLLER |
| GM3844AS8R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:CURRENT MODE PWM CONTROLLER |
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