CURRENT MODE PWM CONTROLLER

AZ3842/3/4/5

Advanced Analog Circuits

Data Sheet

6

March 2003

Rev: 1.0

Electrical Characteristics (Continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Fall Time

50

150

ns

UNDER -VOLTAGE LOCKOUT SECTION

Start Threshold

AZ3842/AZ3844

14.5

15.5

16.5

V

AZ3843/AZ3845

7.8

8.4

9.0

V

Min. Operation Voltage

(After Turn On)

(Min.)

AZ3842/AZ3844

8.5

10.0

11.5

V

AZ3843/AZ3845

7.0

7.6

8.2

V

PWM SECTION

Max. Duty Cycle

D(Max.)

AZ3842/AZ3843

93

95

100

%

D(Max.)

AZ3844/AZ3845

46

48

50

%

Min. Duty Cycle

D(Min.)

0

%

TOTAL STANDBY CURRENT SECTION

Start-Up Current

0.6

1

mA

Operating Supply Current

Vpin3=Vpin2=0V

10

14

mA

Zener Voltage

30

34

V

OVER-TEMPERATURE PROTECT SECTION

Shutdown Temperature

(Note 6)

165

Temperature Hysteresis

(Note 6)

25

A=

∆VPin 3

Note 4: Parameters are tested at trip point of latch with Vpin2 = 0.

Note 5: Here gain is defined as:

∆VPin 1

Note 6: These parameters, although guaranteed, are not 100% tested in production.

Figure 4. Basic Test Circuit

1

2

8

7

AZ3842

3

45

6

OUTPUT

GND

COMP

OUTPUT

GND

1K

1W

5k

ADJUST

1k

ERROR AMP

ADJUST

4.7k

100k

2N2222

4.7k

0.1

µf

0.1

µf

A