CURRENT MODE PWM CONTROLLER

AP384XC

Data Sheet

7

Jul. 2013 Rev. 2. 0

BCD Semiconductor Manufacturing Limited

Electrical Characteristics (Continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

UNDER -VOLTAGE LOCKOUT SECTION

Start Threshold

AP3842C/AP3844C

15

16

17

V

AP3843C/AP3845C

7.8

8.4

9.0

V

Min. Operation Voltage

(After Turn On)

(Min.)

AP3842C/AP3844C

8.5

10.0

11.5

V

AP3843C/AP3845C

7.0

7.6

8.2

V

PWM SECTION

Max. Duty Cycle

D(Max.)

AP3842C/AP3843C

95

97

100

%

D(Max.)

AP3844C/AP3845C

46

48

50

%

Min. Duty Cycle

D(Min.)

0

%

TOTAL STANDBY CURRENT SECTION

Start-up Current

50

80

μA

50

80

Operating Supply Current

Vpin3=Vpin2=0V

8

12

mA

Zener Voltage

30

34

V

OVER-TEMPERATURE PROTECT SECTION

Shutdown Temperature

(Note 6)

155

Temperature Hysteresis

(Note 6)

25

A=

, 0

ΔVPin 3

Note 5: Here gain is defined as:

ΔVPin 1

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

Note 7: This parameter is measured with RT=10k

So the total current flowing into the CT pin will be 0.3mA higher than the measured value approximately.

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

Figure 4. Basic Test Circuit

1

2

8

7

AP384XC

3

45

6

V

REF

V

CC

OUTPUT

GND

R

I

SENSE

V

FB

COMP

V

REF

V

CC

OUTPUT

GND

1K

1W

C

T

5k

I

SENSE

ADJUST

1k

ERROR AMP

ADJUST

4.7k

100k

2N2222

4.7k

R

T

0.1

μF

0.1

μF

A