ELECTRICAL CHARACTERISTICS
(Continued)
(T
A
= 0°C to 70°C, *V
CC
=15V, C
T
=3.3nF, R
T
=10kW, unless otherwise specified )
CHARACTERISTICS
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Total Standby Current
Start-Up Current
Operating Supply Current
Zener Voltage
I
ST
I
CC(OPR)
V
Z
GM3842A/ 43A/ 44A/ 45A
V
PIN3
= V
PIN2
=0V
I
CC
= 25mA
30
0.17
13
38
0.3
17
mA
mA
V
D
(MAX)
D
(MIN)
GM3842A, GM3843A
GM3844A, GM3845A
95
47
97
48
100
50
0
%
%
%
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
* Adjust V
CC
above the Startup threshold before setting to 15 V.
Note1:
Parameter measured at trip point of latch with V
PIN2
= 0.
Note2:
Gain defined as A=DV
PIN1
/
DV
PIN3
; 0
V
PIN3
0.8V
Note3:
These parameters, although guaranteed, are not 100% tested in production
GM3842A, GM3843A, GM3844A, GM3845A
TYPICAL PERFORMANCE CHARACTERISTICS
R
T
(KW)
50
C
T
= 1000pF
C
T
= 200pF
20
10
C
T
= 2nF
5
C
T
= 5nF
C
T
= 10pF
2 V
CC
= 15V
1 T
A
=25°C
10
20
30
50
100
200 300 500
C
T
= 1nF
C
T
= 500pF
%
50
30
20
10
V
CC
= 15V
T
A
=25°C
C
T
= 5nF
C
T
= 10pF
C
T
= 2nF
C
T
= 1nF
C
T
= 500pF
C
T
= 200pF
C
T
= 1000pF
5
3
2
1
fosc
(kHz)
10
20
30
50
100
200 300 500
fosc
(kHz)
Figure 1. Timing Resistor vs. Oscillator Frequency
Figure 2. Output Dead-Time vs. Oscillator Frequency
6
GAMMA [ GAMMA MICROELECTRONICS INC. ]
