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PDF GM38C44 Datasheet ( Hoja de datos )

Número de pieza GM38C44
Descripción (GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Fabricantes Gamma 
Logotipo Gamma Logotipo

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GM38C44 Hoja de datos, Descripción, Manual
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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

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GM38C44 pdf
ELECTRICAL CHARACTERISTICS
(TA = -40°C to 85°C, Note 4, VDD = 15V, CT=3.3 nF, RT=11kW, unless otherwise noted )
CHARACTERISTICS
TEST CONDITIONS
Output Section
RDS(ON) High
RDS(ON) Low
Rise Time
Fall Time
Undervoltage Lockout Section
ISOURCE = 200mA
ISINK = 200mA
TA = 25°C, CL = 1nF
TA = 25°C, CL = 1nF
Start Threshold
GM38C42, GM38C44
GM38C43, GM38C45
Minimum Operating Voltage
GM38C42, GM38C44
GM38C43, GM38C45
PWM Section
Maximum Duty Cycle
GM38C42, GM38C43
GM38C44, GM38C45
Minimum Duty Cycle
Total Standby Current
Start - Up Current
Operating Supply Current
Zener Voltage (VDD)
VDD = 13V for GM38C42, GM38C44
VDD = 7.5V for GM38C43, GM38C45
VFB = VISNS = 0V
IDD = 25 mA, Note 6
MIN
13.5
7.8
8
7.0
94
46
30
TYP
20
11
40
30
14.5
8.4
9
7.6
96
50
50
4
37
MAX UNIT
W
80 ns
60 ns
15.5
V
9.0
10
V
8.2
%
0%
200
µA
6 mA
V
Note 1: These parameters, although guaranteed, are not 100% tested in production.
Note 2: Parameter measured at trip point of latch with VEA = 0.
Note 3: Gain defined as:
A=
DVPIN1
VTH (ISNS)
;0
VTH (ISNS) 0.8V
Note 4: Adjust VDD above the start threshold before setting at 15V.
Note 5: Output frequency equals oscillator frequency for the GM38C42 and GM38C43. Output frequency for the
GM38C44, and GM38C45 equals one half the oscillator frequency.
Note 6: On 8-pin version, 18V is maximum input on pin 7, as this is also the supply pin for the output stage.
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