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GM38C44 の電気的特性と機能

GM38C44のメーカーはGammaです、この部品の機能は「(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS」です。


製品の詳細 ( Datasheet PDF )

部品番号 GM38C44
部品説明 (GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
メーカ Gamma
ロゴ Gamma ロゴ 




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GM38C44 Datasheet, GM38C44 PDF,ピン配置, 機能
www.DataSheet4U.com
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, ピン配列
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


3Pages


GM38C44 電子部品, 半導体
TYPICAL PERFORMANCE CHARACTERISTICS
100
200pF
470pF
10
10nF
1.8nF
1nF
4.7nF
VDD = 15V
1
1x104
1x105
5x105
OSCILLATOR FREQUENCY (Hz)
Figure 1. Oscillator Frequency Configuration
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4
7.2 VDD = 15V
VOSC = 2V
7.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Figure 3. Oscillator Discharge Current vs.
Temperature
120
VDD = 15V
100
80
60
40
20
0
-60 -30
0 30 60 90 120 150
TEMPERATURE (°C)
Figure 5. Short - Circuit Reference Current vs.
Temperature
100
VDD = 15V
10 10nF
4.7nF 18nF
1nF
470pF
200pF
1
1x104
1x105
1x106
FREQUENCY (Hz)
Figure 2. GM38C42, GM38C43 Output Dead Time
vs. Oscillator Frequency
1.2
1.0
0.8
125°C
25°C
0.6
0.4
-50°C
0.2
0.0
024
68
ERROR AMPLIFIER OUTPUT (V)
Figure 4. Current Sense Amplifier vs.
Error Amplifier Output
25
20
15
10
5
0
-5
-10 VD = 15V
-15 CL = 1nF
0.0 0.2 0.4 0.6 0.8
1.0
TIME (µS)
Figure 6. GM38C4X Output Waveform
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
GM38C42

(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Gamma
Gamma
GM38C43

(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Gamma
Gamma
GM38C44

(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Gamma
Gamma
GM38C45

(GM38C42 - GM38C45) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Gamma
Gamma


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