AP3987CT

Document number: DS41644 Rev. 2 - 2

5 of 15

www.diodes.com

June 2019

© Diodes Incorporated

AP3987CT

Electrical Characteristics (@VCC=15V, TJ=+25°C, unless otherwise specified.) (Note 7)

Symbol

Parameter

Condition

Min

Typ

Max

Unit

STARTUP AND UVLO SECTION

VTH_ST

Turn-On Voltage

—

11

13

15

V

VUVLO

Turn-Off Voltage

—

5.5

5.9

6.3

V

STANDBY CURRENT SECTION

IST

Turn-On Current

VCC=VTH_ST-1V before

Startup

0.01

0.2

0.6

μA

ICC_OPR

Operating Current

Static Current

400

550

700

ICC_NL

Standby Current

At No Load

5

17.5

30

FREQUENCY JITTER SECTION

ΔVCS/VCS

VCS Modulation

NL to Full Load

4.5

5

5.5

%

tMOD

VCS Modulation Period

366

488

610

s

CURRENT SENSE SECTION

VCS_H

Peak Current Sense Voltage Reference

in Heavy Load

45% to 100% of Full

Load (Note 8)

540

600

660

mV

VCS_L

Peak Current Sense Voltage Reference

in Light Load

0% to 8% Full Load

(Note 8)

225

250

275

mV

RLINE

Built-In Line Compensation Resistance

@CP (Note 9)

108

120

132

Ω



tLEB

Leading Edge Blanking

—

300

550

800

ns

CONSTANT VOLTAGE SECTION

VFB

Feedback Threshold Voltage

Tested @75% of

Maximum IOUT

2.505

2.556

2.607

V

VCABLE(MAX)

Cable Compensation Voltage

—

—

0.35

—

V

CONSTANT CURRENT SECTION

tONS/tSW

Secondary Winding Conduction Duty

Tested @VFB=2V

—

4/8

—

—

VALLEY-ON SECTION



tVAL-ON

Valid Off Time of Valley-On

From the End of tONS

20

27

34

s

DYNAMIC SECTION



VTRIGGER

Trigger Voltage for Dynamic Function

—

40

62.5

85

mV

tDELAY

Delay Time for Dynamic Function

From the End of tONS

95

122

150

s

VUV_H

Under Voltage of FB Pin for VCS_H

—

2.34

2.39

2.44

V



POWER MOSFET SECTION

BVDSS

Drain-Source Breakdown Voltage

(Note 6)

@CP Test

650

—

—

V

RDS(ON)

On State Resistance

@CP Test

—

4

—



DRIVER SECTION

ISOURCE

Peak Driver Source Current

@CP Test

18

22

26

mA

PROTECTION FUNCTION SECTION

VFB(OVP)

Over Voltage Protection at FB Pin

—

3.5

3.75

4

V

VCC(OVP)

Over Voltage Protection at VCC Pin

—

27

28.5

30

V

tONP(MAX)

Maximum Turn-On Time

—

14

18

22

s

VCS(MIN)

Minimum Peak Current Sense Voltage

at tONP(MAX)

—

135

150

165

mV

VEM(MAX)

Maximum EM Voltage for Transformer

Saturation Protection (Note 10)

(Note 7)

1.8

2

2.2

V

VFB(SCP)

Short Circuit Protection

VFB @ Hiccup

1.83

1.87

1.92

V

tSCP

Time under VFB(SCP)

—

32

51.5

71

ms

VOTP

External OTP Shutdown Threshold

—

0.49

0.52

0.55

V

VOTP_REC

External OTP Recovery Threshold

—

0.58

0.62

0.66

V

IOTP

External OTP Shutdown Current

—

94

102

110

µA

TOTP

Shutdown Temperature

—

+135

+145

+155

°C

THYS

Temperature Hysteresis

—

+37

+40

+43

°C

Notes：

6. The drain-source voltage is 80% of BVDSS in the aging condition.

7. These parameters are not 100% tested, guaranteed by design and characterization.

8. Peak current sense voltage reference without line compensation.

9. Line compensation voltage on CS reference.

10. EM is an internal pin which is connected to the source of power MOSFET inside.

AUX

LINE

1

FB

LINE

REF

_

CS

V

R

R

R

35

.

0

V

Δ







