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GM38C44 PDF даташит

Спецификация GM38C44 изготовлена ​​​​«Gamma» и имеет функцию, называемую «(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS».

Детали детали

Номер произв GM38C44
Описание (GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Производители Gamma
логотип Gamma логотип 

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GM38C44 Даташит, Описание, Даташиты
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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
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GM38C44 Даташит, Описание, Даташиты
MARKING INFORMATION & PIN CONFIGURATIONS (TOP VIEW)
SOP - 8
VDD
VREF
OUT
GND
8765
GM38CXX
AYWW
1234
COMP
FB
RT / CT
ISNS
DIP - 8
VDD
VREF
8765
OUT
GND
GM38CXX
AYWW
1234
COMP
FB
RT / CT
ISNS
A = Assembly Location
Y = Year
W W = Weekly
ORDERING INFORMATION
Ordering Number
GM38C42S8T
GM38C42S8R
GM38C42D8T
GM38C43S8T
GM38C43S8R
GM38C43D8T
GM38C44S8T
GM38C44S8R
GM38C44D8T
GM38C45S8T
GM38C45S8R
GM38C45D8T
Package
SOP - 8
SOP - 8
DIP-8
SOP - 8
SOP - 8
DIP-8
SOP - 8
SOP - 8
DIP-8
SOP - 8
SOP - 8
DIP-8
* For detail Ordering Number identification, please see last page.
Shipping
100 Units/ Tube
2,500 Units/ Tape & Reel
60 Units/ Tube
100 Units/ Tube
2,500 Units/ Tape & Reel
60 Units/ Tube
100 Units/ Tube
2,500 Units/ Tape & Reel
60 Units/ Tube
100 Units/ Tube
2,500 Units/ Tape & Reel
60 Units/ Tube
2









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GM38C44 Даташит, Описание, Даташиты
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Zener Current
Operation at 16V may require special precautions(Note6)
Supply Voltage(Note 6)
Switch Supply Voltage
Current Sense Voltage
Feedback Voltage
Output Current
Storage Temperature
SYMBOL
IDD
VDD
VD
VISNS
VFB
IOUT
TA
VALUE
30
18
18
- 0.3 to + 5.5
- 0.3 to + 5.5
0.5
- 50 to + 150
UNIT
mA
V
V
V
V
A
°C
OPERATING RATINGS
PARAMETER
Junction Temperature
SYMBOL
TJ
VALUE
150
UNIT
°C
PACKAGE PIN DESCRIPTION
PIN LEAD
1
2
3
4
5
6
7
8
FUNCTION
COMP
FB
ISNS
RT / CT
GND
OUT
VDD
VREF
FUNCTION
Compensation: Connect external Compensation network to modify the error amplifier
output.
Feedback (Input): Error amplifier input .Feedback is 2.5Vat desired output voltage.
Current Sense (Input): Current sense comparator input. Connect to current sensing
resistor or current transformer.
Timing Resistor / Timing Capacitor: Connect external RC network to select switching
frequency.
Ground: Combined analog and power ground.
Power Output: Totem - pole output.
Analog Supply (Input): Controller circuitry supply input. Return to analog ground (AGND).
5V Reference (Output): Connect external RC network.
BLOCK DIAGRAM
VDD
7
VREF
8
35V
5V
Reference
UVLO
*
RT / CT
4
FB -
2 2.5V
+
+-
Oscillator
2R
R
-
+
COMP
1
GND* ISNS
53
TQ
S
R
Q
*
OUTPUT
6
* 8 - lead versions only
3










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Номер в каталогеОписаниеПроизводители
GM38C42(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERSGamma
Gamma
GM38C43(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERSGamma
Gamma
GM38C44(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERSGamma
Gamma
GM38C45(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERSGamma
Gamma

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