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3700AZ-E1

LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER

BCD Semiconductor 

Data Sheet

LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700/A

Electrical Characteristics

(VCC=4V, TJ=25oC, unless otherwise specified.)

Parameter

Symbol

Conditions

UVLO SECTION

Start-up Voltage

VTH (ST)

Minimal Operating Voltage VOPR(min)

STANDBY CURRENT SECTION

Start-up Current (Note 3)

Operating Current

VCC Zener Voltage

Dynamic Impedance

INTERNAL OSCILLATOR

IST

ICC(OPR)

VZ

RVCC

VCC=4V

ICC=10mA

VCC=3.8 to 4.8V

Switching Frequency

FSW

Frequency Dither

Temperature Stability

DRIVE OUTPUT SECTION

OUT Start-up Voltage

VST

Short Circuit Threashold

Voltage (Note 4)

VSC

Min Typ Max Unit

5.00 5.25 5.50

V

3.4

3.65

3.9

V

0.22

0.4

mA

0.45

0.7

6

6.3

V

18

kΩ

50

60

75

kHz

±2

±2.5

±3

kHz

5

8

%

8.5

11

V

6

V

Rise Time

TR

CL=1nF, 15Ω pull-up

60

Fall Time

TF

CL=1nF, 15Ω pull-up

30

Maximum Duty Cycle

DMAX VOPR(min) + 0.2V

67

75

Minimum Duty Cycle

VCC=VTH (ST)-0.2V

3

Driver OUT On-Resistance

ROUT IOUT=0.06A

3

Switch Off Current (OUT)

Driver off, VOUT=10V

20

Effective Current Limit

For AP3700 460

ILIM

VCC = VOPR+0.1V

For AP3700A 500

ns

84

%

Ω

40

µA

mA

OUT Current Coefficient

GA

-0.3

A/V

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.

Mar. 2008 Rev. 1. 4

BCD Semiconductor Manufacturing Limited

5

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