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參數(shù)資料
| 型號： | GM38C45 |
| 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(shù)： | 1/11頁 |
| 文件大?。?/td> | 166K |
| 代理商： | GM38C45 |
Description
GM38C4x is fixed frequency, high performance, and cur-
rent- mode PWM controllers. Gamma's BiCMOS devices
are pin compatible with standard 384x bipolar devices but
with several improvements.
Undervoltage lockout circuitry allows the '42 and '44 ver-
sions to start up at 14.5V and operate down to 9V, and the
'43 and '45 versions start at 8.4V with operation down to
7.6V. All versions operate up to 16V.
When compared to bipolar 384x devices operating from a
15V supply, start-up current has been reduced to 50A typi-
cal and operating current has been reduced to 4.0 mA typi-
cal. Decreased output rise/fall times drive larger MOSFETs,
and rail-to-rail output capability increases efficiency, espe-
cially at lower supply voltages. GM38C4x also features a
trimmed oscillator discharge current and bandgap refer-
ence.
GM38C4x denotes 8-pin plastic DIP and SOP packages.
Application
Current-mode, off-line, switched-mode
power supplies
Current-mode, dc-to-dc converters.
Step-down "buck" regulators
G
M
4
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Features
40ns output rise and 30ns output fall times
-40
° to +85°C temp. range same as standard
UC284x
Low-power BiCMOS Process
Very low start-up current (50A typical)
Low operating current (4mA typical)
CMOS outputs with rail-to-rail swing
500kHz current-mode operation
Pin-for-pin compatible with UC3842/ 3843
/ 3844/ 3845(A)
Trimmed oscillator discharge current
UVLO with hysteresis
Low cross-conduction currents
G
M
3
8
C
4
2
,
G
M
3
8
C
4
3
,
G
M
3
8
C
4
,
G
M
3
8
C
4
5
www.gammamicro.com
1
Step-up "boost" regulators
Flyback, isolated regulators
Forward converters
Synchronous FET converters
V
0
.1
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