AP3981C

Document number: DS41619 Rev. 2 - 2

5 of 16

www.diodes.com

June 2019

© Diodes Incorporated

AP3981C

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

Symbol

Parameter

Condition

Min

Typ

Max

Unit

STARTUP AND UVLO SECTION

VTH_ST

Startup Threshold

—

14.5

16

17.5

V

VOPR(MIN)

Minimum Operating Voltage

—

6.1

6.8

7.5

V

STANDBY CURRENT SECTION

IST

Startup Current

VCC=VTH_ST-1V before

Startup

—

1

3

A

ICC_OPR

Minimum Operating Current

Static Current

450

550

650

A

CURRENT SENSE SECTION



VCS_H

Peak Current Sense Threshold

Voltage

40% to 100% CC Load

560

630

700

mV

VCS_L

No Load to 2% CC Load

160

180

200

mV

RLINE

Built-In Line Compensation

Resistance

—

45

55

65



tLEB

Leading Edge Blanking

—

370

470

570

ns

CONSTANT VOLTAGE SECTION

VFB

Feedback Threshold Voltage

Closed Loop Test of VOUT

2.35

2.4

2.45

V

RatioSAMPLE_L

Sample Ratio

No Load to 2% CC Load

45

50

55

%

RatioSAMPLE_H

Sample Ratio

40% to 100% CC Load

75

80

85

%



CONSTANT CURRENT SECTION

tONS/tSW

Below SUVP

Tested @ VFB=1V

—

0.75

—

—



Above SUVP

Tested @ VFB=2V

—

0.5

—

—

FREQUENCY JITTER



ΔVCS/VCS

VCS Modulation

10% Load to Full Load

1.5

2

2.5

%

Cable Compensation



VCABLE/VOUT

Fixed Cable Compensation Ratio

—

—

4

—

%

VALLEY-ON SECTION

tVAL-ON

Valid Off Time of Valley-On

From the End of tONS

26

32

38

s

DYNAMIC SECTION

tOFF(MAX)

Maximum Off Time

—

1.8

2

2.2

ms

PROTECTION FUNCTION SECTION

VFB(SOVP)

Over Voltage Protection at FB Pin

—

3.3

3.6

3.9

V

VFB(SUVP)

Under Voltage Protection at FB Pin

—

1.22

1.35

1.48

V

tDELAY(SUVP)

Delay Time of SUVP

—

116

128

140

ms

VFB(SCP)

Output Short Protection at FB Pin

—

680

750

820

mV

tDELAY(SCP)

Delay Time of SCP

—

58

64

70

ms

VCC(OVP)

Over Voltage Protection at VCC Pin

—

29.5

32

34.5

V

tONP(MAX)

Maximum Turn-ON Time

—

12

16

20

s

VCS(MIN)

Minimum Peak Current Sense

Voltage at tONP=4s

—

120

150

180

mV

VCS(MAX)

Maximum CS Voltage

—

720

800

880

mV