Advanced Analog Circuits
Data Sheet
AZ3842/3/4/5
CURRENT MODE PWM CONTROLLER
Electrical Characteristics (Continued)
Parameter
Fall Time
Symbol
t
F
Conditions
T
J
=25
o
C, C
L
=1nF (Note 6)
AZ3842/AZ3844
AZ3843/AZ3845
AZ3842/AZ3844
AZ3843/AZ3845
AZ3842/AZ3843
AZ3844/AZ3845
14.5
7.8
8.5
7.0
93
46
Min
Typ
50
15.5
8.4
10.0
7.6
95
48
Max
150
16.5
9.0
11.5
8.2
100
50
0
Unit
ns
V
V
V
V
%
%
%
mA
mA
V
o
UNDER -VOLTAGE LOCKOUT SECTION
Start Threshold
V
TH
(ST)
Min. Operation Voltage
(After Turn On)
PWM SECTION
Max. Duty Cycle
Min. Duty Cycle
Start-Up Current
Operating Supply Current
Zener Voltage
Shutdown Temperature
Temperature Hysteresis
D(Max.)
D(Max.)
D(Min.)
I
ST
I
CC
(OPR)
V
Z
T
SHUT
T
HYS
V
OPR
(Min.)
TOTAL STANDBY CURRENT SECTION
0.6
Vpin3=Vpin2=0V
I
CC
=25mA
(Note 6)
(Note 6)
30
10
34
165
25
1
14
OVER-TEMPERATURE PROTECT SECTION
C
o
C
Note 4: Parameters are tested at trip point of latch with Vpin2 = 0.
Note 5: Here gain is defined as:
∆VPin
1
A=
, 0
≤
Vpin3
≤
0.8V
∆VPin
3
Note 6: These parameters, although guaranteed, are not 100% tested in production.
V
REF
4.7k
R
T
2N2222
COMP
1k
ERROR AMP
ADJUST
4.7k
100k
V
FB
5k
I
SENSE
ADJUST
I
SENSE
R
T
/C
T
2
7
1
A
AZ3842
8
V
CC
V
REF
V
CC
0.1µf
OUTPUT
GND
1K
1W
OUTPUT
0.1µf
3
6
4
5
C
T
GND
Figure 4. Basic Test Circuit
March 2003
6
Rev: 1.0
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
