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PDF ( 数据手册 , 数据表 ) GM38C44

零件编号 GM38C44
描述 (GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
制造商 Gamma
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GM38C44 数据手册, 描述, 功能
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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 50µA 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.
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 (50µA 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
Application
Current-mode, off-line, switched-mode
power supplies
Current-mode, dc-to-dc converters.
Step-down "buck" regulators
Step-up "boost" regulators
Flyback, isolated regulators
Forward converters
Synchronous FET converters
www.gammamicro.com 1







GM38C44 pdf, 数据表
VIN
26V to 40V
R2
68k
D2
M17Z105
1/4W
D3
MBR030
Q1
CT1 IRF820
0.1µF* MKS2
6.8k
0.22µF
R4
18
100k GM38C42
1 8COMP
VREF
2 FB
3 ISNS
7VDD
OUT 6
4 RT/CT
GND 5
D4
1N765B
C5 + 4.7W
4.7µF
0.1µF
T1
C8
0.1µF
C7 R5
200pF 16k
0.1µF
L1 48µH
VOUT
12V, 2A
R1
10
1/2W
31DQ10
D1 C3
3.3µF
C2
1000pF
C4
0.1µF
D5
1N4001
6.19k
1%
1.62k
1%
* Locate near GM38C42 supply pins
Figure 7. 500kHz, 25W, Buck Converter
Test
Line Regulation
Load Regulation
Efficiency
Output Ripple
Conditions
VIN= 26V to 80V, IO= 2A
VIN= 48V, IO= 0.2A to 2A
VIN= 48V, IO= 2A
VIN= 48V, IO= 2A (20MHz BW)
Results
0.5%
0.6%
90%
100mV
8














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