Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TJ=25oC, CL=1nF (Note 6)
Fall Time
tF
50
150
ns
UNDER -VOLTAGE LOCKOUT SECTION
Start Threshold
VTH(ST)
AZ3842/AZ3844
AZ3843/AZ3845
AZ3842/AZ3844
AZ3843/AZ3845
14.5
7.8
8.5
7.0
15.5
8.4
16.5
9.0
V
V
V
V
Min. Operation Voltage
(After Turn On)
VOPR
10.0
7.6
11.5
8.2
(Min.)
PWM SECTION
D(Max.)
D(Max.)
D(Min.)
AZ3842/AZ3843
AZ3844/AZ3845
93
46
95
48
100
50
0
%
%
%
Max. Duty Cycle
Min. Duty Cycle
TOTAL STANDBY CURRENT SECTION
Start-Up Current
IST
ICC(OPR)
VZ
0.6
10
34
1
mA
mA
V
Operating Supply Current
Zener Voltage
Vpin3=Vpin2=0V
ICC=25mA
14
30
OVER-TEMPERATURE PROTECT SECTION
oC
oC
Shutdown Temperature
Temperature Hysteresis
TSHUT
THYS
(Note 6)
(Note 6)
165
25
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.
VREF
RT
4.7k
2N2222
A
VCC
COMP
VFB
AZ3842
VREF
VCC
1
2
3
4
8
7
6
5
100k
1k
ERROR AMP
ADJUST
0.1µf
1K
1W
5k
ISENSE
ADJUST
ISENSE
RT/CT
OUTPUT
OUTPUT
GND
4.7k
GND
0.1µf
CT
Figure 4. Basic Test Circuit
March 2003
Rev: 1.0
6
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
