GM3842A 查看數據表（PDF） - Gamma Microelectronics Inc.
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GM3842A Datasheet PDF : 8 Pages
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GM3842A, GM3843A
GM3844A, GM3845A
CURRENT MODE PWM CONTROLLER
Electrical Characteristics (TA = 0°C to 70°C, *VCC=15V, CT=3.3nF, RT=10k , unless otherwise
specified)
Parameter
Symbol
Condition
Min
Typ Max Unit
Reference Section
Reference output
Voltage
Line Regulation
Load Regulation
Short CirCuit output
Current
Oscillator Section
VREF TJ= 25°C, IREF= 1mA
∆VREF-V
∆VREF-I
12V < VCC < 25V
1mA < IREF < 20mA
ISC
TA=25°C
4.9
5.0 5.1
V
6.0
20
mV
6.0
25
mV
-100 -180 mA
Oscillation Frequency
Frequency Change
with Voltage
Oscillator Amplitude
f
TJ= 25°C
∆f/∆VCC 12V < VCC < 25V
V(osc) (Peak to Peak)
47
52
57 KHz
0.05
1
%
1.6
V
Error Amplifier Section
Input Bias Current
IBIAS
VFB = 3V
Input Voltage
Open Loop Voltage
Gain
Power Supply
Rejection Ratio
VI(EA) VPIN1 = 2.5V
AVOL(EA) 2V < VO < 4V
PSRR(EA) 12V < VCC < 25V
Output Sink Current
ISINK(EA) VPIN2 = 2.7V, VPIN1 = 1.1V
Output Source Current Isource(EA) VPIN2 = 2.3V, VPIN1 = 5V
High Output Voltage
VOH(EA) VPIN2 = 2.3V, RL =15K to GND
Low Output Voltage
VOL(A) VPIN2 = 2.7V, RL =15K to GND
-0.1
-2
µA
2.42
2.5 2.58
V
65
90
dB
60
70
dB
2
7
mA
-0.5
-1.0
mA
5.0
6.0
V
0.8 1.1
V
Current Sense Section
Current Sense Input
Voltage Gain
GV
Maximum Input Signal
Supply Voltage
Rejection
Input Bias Current
VI(MAX)
SVR
IBIAS
(Note 1 and 2)
VPIN1 = 5V (Note 1)
12V < VCC < 25V (Note 1)
VPIN3 = 3V
2.85
3.0 3.15 V/V
1.0 1.1
V
70
dB
-3.0 -10
µA
Output Section
Low Output Voltage
High Output Voltage
Rise Time
Fall Time
ISINK = 20mA
VOL
ISINK = 200mA
ISource= -20mA
VOH
Isource = -200mA
tr
TJ = 25°C, CL = 1nF (Note 3)
tf
TJ = 25°C, CL = 1nF (Note 3)
0.8 0.4
V
1.4 2.2
13
13.5
V
12
13
45
150
ns
35
150
ns
4
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