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參數資料
型號: GM3845AS8R
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: GM3845AS8R
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.
G
M
4
3
1
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
G
M
3
8
4
2
A
,
G
M
3
8
4
3
A
,
G
M
3
8
4
A
,
G
M
3
8
4
5
A
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
相關PDF資料
PDF描述
GM3845AS8T HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM3845A HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42D8T HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42S8R HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42S8T HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
相關代理商/技術參數
參數描述
GM3845AS8T 制造商:GAMMA 制造商全稱:GAMMA 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38863-21 制造商:ITT Interconnect Solutions 功能描述:038863-0021 - Bulk
GM38C42 制造商:GAMMA 制造商全稱:GAMMA 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42D8T 制造商:GAMMA 制造商全稱:GAMMA 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42S8R 制造商:GAMMA 制造商全稱:GAMMA 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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