TYPICAL PERFORMANCE CHARACTERISTICS
Dmax
(%)
90
80
70
60
50
40
V
CC
= 15V
C
T
= 3.3nF
T
A
=25°C
(dB)
80
60
40
20
0
-20
10
V
CC
= 15V
V
O
= 2V to 4V
R
L
= 100K
T
A
= 25°C
1
2
3
5
R
T
(kW)
100
1k
10k
100k
1M
f (Hz)
Figure 3. Maximum Output Duty Cycle vs.
Timing Resistor (GM3842A/43A)
Figure 4. Error Amp Open-Loop Gain vs.
Frequency
V
th
(V)
V
CC
= 15V
1.0
0.8
0.6
0.4
0.2
T
A
= 125°C
T
A
= 25°C
I
SC
(mA)
100
90
80
70
60
V
CC
= 15V
0
2
4
6
V
O
(V)
50
0
25
50
75
Figure 5. Current Sense Input Threshold vs.
Error Amp Output Voltage
100
T (°C)
A
Figure 6. Reference Short Circuit Current vs.
Temperature
V
sat
(V)
-1
-2
80µs Pulsed Load 120Hz Rate
I
CC
(mA)
I
Sense
= 0V
Sourse Saturation
(Load to Ground)
V
FB
= 0V
R
T
= 10K
T
A
= 25°C
20 C = 3.3nF
T
GM3843A/ 45A
15
10
Sink Saturation
(Load to V
CC
)
5
0
200
400
600
I
O
(mA)
0
10
20
30
V
CC
(V)
Figure 7. Output Saturation Voltage vs.
Load Current T
A
= 25°C
Figure 8. Supply Current vs. Supply Voltage
V
CC
= 15V
3
2
1
0
0
GM3842A, GM3843A, GM3844A, GM3845A
7
GM3842A/ 44A
GAMMA [ GAMMA MICROELECTRONICS INC. ]
