LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER

AP3700/A

Data Sheet

5

BCD Semiconductor Manufacturing Limited

Mar. 2008 Rev. 1. 4

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

UVLO SECTION

Start-up Voltage

5.00

5.25

5.50

V

Minimal Operating Voltage

3.4

3.65

3.9

V

STANDBY CURRENT SECTION

Start-up Current (Note 3)

0.22

0.4

mA

Operating Current

0.45

0.7

6

6.3

V

Dynamic Impedance

18

k

Ω

INTERNAL OSCILLATOR

Switching Frequency

50

60

75

kHz

Frequency Dither

kHz

Temperature Stability

5

8

%

DRIVE OUTPUT SECTION

OUT Start-up Voltage

8.5

11

V

Short Circuit Threashold

Voltage (Note 4)

6V

Rise Time

60

ns

Fall Time

30

Maximum Duty Cycle

67

75

84

%

Minimum Duty Cycle

3

Driver OUT On-Resistance

3

Ω

Switch Off Current (OUT)

20

40

µA

Effective Current Limit

For AP3700

460

mA

For AP3700A

500

OUT Current Coefficient

-0.3

A/V

Electrical Characteristics

Note 3: AP3700/A is an emitter drive controller, the PWM controller will start up only when the voltage on the OUT pin rises

up to its threshould value.

Note 4: AP3700/A performs its short circuit function by shutdown the OUT pulse when the OUT pin voltage drops below its

short circuit threshold value.