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GM3845AS8R 参数 Datasheet PDF下载

GM3845AS8R图片预览
型号: GM3845AS8R
PDF下载: 下载PDF文件 查看货源
内容描述: 高性能电流模式PWM控制器 [HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS]
分类和应用: 控制器
文件页数/大小: 19 页 / 628 K
品牌: GAMMA [ GAMMA MICROELECTRONICS INC. ]
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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.
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
SIMPLIFIED BLOCK DIAGRAM
V
CC
7
V
ref
8
R
R
V
REF
Undervoltage
LOCKOUT
OSCILLATOR
Error
Amplifier
+
-
Latching
PWM
5 Power Ground
3 Current Sense Input
5
GND
5.0V
REFERENCE
V
CC
Undervoltage
LOCKOUT
7 V
C
R
T
/ C
T
4
6 Output
Voltage Feedback Input 2
Output Compensation 1
GM3842A, GM3843A, GM3844A, GM3845A
1
www.gammamicro.com
GM 431
V1.0