AP3971P7-G1 Datasheet AP3971P7-G1 | P4-P6

AP3965/66/71

Document number: DS36531 Rev. 3 - 2

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Absolute Maximum Ratings (Note 5)

Symbol Parameter Rating Unit

V

CC

Supply Voltage -0.3 to +22 V

V

FB

FB Input Voltage -1 to +10 V

V

CBO

Collector-emitter Voltage 700 V

–

Collector DC Current

AP3965 1.5

A

AP3966 3.2

AP3971 4

T

J

Operating Junction Temperature 150 °C

T

STG

Storage Temperature -65 to +150 °C

T

LEAD

Lead Temperature (Soldering, 10 sec) 300 °C

– ESD (Machine Model) 200 V

– ESD (Human Body Model) 2000 V

P

D

Total Power Dissipation

AP3965 0.9

W AP3966 1.4

AP3971 1.5

Note: 5. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not

implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Symbol Parameter Min Max Unit

V

CC

Supply Voltage – 22 V

T

OP

Operating Temperature Range -40 +85 °C

f

MAX

Maximum Operating Frequency – 60 kHz

Thermal Impedance (Note 6)

Symbol Parameter Value Unit

θ

JA

Junction to Ambient

AP3965 80

°C/W

AP3966 50

AP3971 45

θ

JC

Junction to Case

AP3965 40

AP3966 26

AP3971 22

Note: 6. When mounted a standard single-sided FR4 board with 300mm

2

Cu (at least 35μm thick) connected to all collectors and CS pins.

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-40-200 20406080100120

13.0

13.5

14.0

14.5

15.0

15.5

16.0

16.5

17.0

Turn-on Voltage (V)

Ambient Temperature (

o

C)

125

-40 -20 0 20 40 60 80 100 120

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

Turn-off Voltage (V)

Ambient Temperature (

o

C)

125

-40 -20 0 20 40 60 80 100 120

300

350

400

450

500

550

600

Operating Current (μA)

Ambient Temperature (

o

C)

125

Electrical Characteristics (@V

CC

=15V, T

J

= +25°C, unless otherwise specified.)

Symbol Parameters Conditions Min Typ Max Unit

UVLO Section

V

ON

Turn-on Voltage – 13 15 17 V

V

OFF

Turn-off Voltage No drive current 4.5 5.3 6.3 V

Standby Current Section

I

ST

Start-up Current

V

CC

= V

ON

-0.5V

–

0.2 0.6

µA

I

CC

Operating Current – 320 435 550

Feedback Input Section

I

FB

FB Input Current

V

FB

= 4V

1.5 3.5 5.5 µA

V

FB

FB Threshold Voltage

–

4.324 4.4 4.476 V

Power Transistor Section

V

CE(SAT)

Collector-emitter Saturation

Voltage

AP3965: I

C

= 0.5A

AP3966/71: I

C

= 1A

–

0.3 V

h

FE

DC Current Gain

AP3965 14 17 –

–

AP3966/71 17 26

–

I

CEO

Leakage Current – – –

60 nA

Over Temperature Protection

T

SHDN

Shutdown Temperature Surface temperature 125 160

–

°C

–

Temperature Hysteresis

– –

40

–

°C

Performance Characteristics

Turn-on Voltage vs. Ambient Temperature Turn-off Voltage vs. Ambient Temperature

Operating Current vs. Ambient Temperature

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Operation Description

+

C1

+

C

O

V

O

D1

R

FB1

R

FB2

R

CS

C

FB

CS

GND

AP3965/66/71

Ns

N

AUX

Np

I

OUT

Vs

V

AUX

v

IN

L

M

CPC

C

CPC

Q1

Figure 1 Simplified Flyback Converter Controlled by AP3965/66/71

Constant Primary Peak Current

The primary current Ip(t) is sensed by a current sense resistor R

CS

as shown in Figure 1.

The current rises up linearly at a rate of:

M

L

)t(vg

dt

)t(dip

=

…………(1)

Ip

0A

See equation 2

Figure 2 Primary Current Waveform

As illustrated in Figure 2, when the current Ip(t) rises up to Ipk, the switch Q1 turns off. The constant peak current is given by:

Rcs

Vcs

Ipk =

…………(2)

The energy stored in the magnetizing inductance L

M

each cycle is therefore:

2

M

IpkL

2

1

Eg ⋅⋅=

…………(3)

So the power transferring from input to output is given by:

SW

2

M

fIpkL

2

1

P ⋅⋅⋅=

…………(4)

Where f

SW

is the switching frequency. When the peak current Ipk is constant, the output power depends on the switching frequency f

SW

.

AP3971P7-G1

AP3971P7-G1

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