GM3842A データシートの表示（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
Typical Performance Characteristics
RT (K)
50
CT = 1nF
20
10
CT = 5nF
5
CT = 10pF
CT = 2nF
CT = 1000pF
CT = 200pF
CT = 500pF
2 VCC = 15V
1 TA = 25°C
10 20
50 100 200 300 500 fosc (KHZ)
Figure 1. Timing Resistor vs. Oscillator Frequency
Dmax
(%)
VCC = 15V
90 CT = 3.3nF
TA = 25°C
80
%
VCC = 15V
50
30
CT = 5nF
20
CT = 10pF
10
CT = 2nF
CT = 1nF
5
CT = 500pF
CT = 200pF
CT = 1000pF
2
1
10 20 30
50 100 200 300 500 fosc (kHz)
Figure 2. Output Dead-Time vs. Oscillator Frequency
(dB)
80
60
VCC = 15V
VO = 2V to 4V
RL = 100K
TA = 25°C
70
60
50
40
1
2
3
5
RT (k
Figure 3. Maximum Output Duty Cycle vs.
Timing Resistor (GM3842A/43A)
VTH
(V)
VCC = 15V
1.0
0.8
TA = 125°C
TA = 25°C
0.6
40
20
0
-20
l0 l00 lk l0k
l00k
lM
Figure 4. Error Amp Open-Loop Gain vs.
Frequency
ISC
(mA)
l00
90
VCC = 15V
80
0.4
70
0.2
60
0
2
4
6 VO (V)
Figure 5. Current Sense Input Threshold vs.
Error Amp Output Voltage
Vsat
(V)
-1 Source Saturation
(Load to Ground)
-2
VCC = 15V
50μs Pulsed Load 120Hz Rate
3
50
0
25 50
75 l00 TA (°C)
Figure 6. Reference Short Circuit Current vs.
Temperature
ICC
(mA)
20
ISENSE = 0V
VFB = 0V
RT = 10K
TA = 25°C
CT = 3.3nF
l5
2
10
Sink Saturation
l
(Load to V+)
5
0
0
200
400
600 Io (mA)
0
0
10
20
30
VCC (V)
Figure 7. Output Saturation Voltage vs.
Figure 8. Supply Current vs. Supply Voltage
6
Load Current TA= 25°C
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