R2A20124AFP/R2A20124ASP

Preliminary

REJ03D0928-0200 Rev.2.00

Page 10 of 12

Aug 03, 2010

Electrical Characteristics (cont.)

(Ta = 25°C, Vcc = 12 V, RT = 180 k

, Rdelay = 51 k, Rramp-slp = 27 k, unless otherwise specified.)

Item

Symbol

Min

Typ

Max

Unit

Test Conditions

OVER CURRENT PROTECTION: R2A20124AFP/ASP

Pulse-by-pulse current limit

threshold

1.26

1.4

1.54

V

SEC-CONT = 0.3 V (AFP)

Delay to OUT pins *

1

Tpd-cs

—

100

200

ns

CS = 0 V to 1.57 V,

SEC-CONT = 0.3 V (AFP)

CS sink current

2

5

—

mA

CS = 0.15 V, COMP = 0 V

OUTPUT: R2A20124AFP/ASP

High voltage

11.5

11.9

—

V

IOUT = –2 mA

Low voltage

—

0.05

0.2

V

IOUT = 2 mA

Rise time

tr

—

30

100

ns

COUT = 100 pF

Fall time

tf

—

30

100

ns

COUT = 100 pF

Timing offset *

2

—

20

140

ns

POWER INFORMATION AMPLIFIER: R2A20124AFP

Tranceconductance

gm

15

20

25

s

CS = 0.4 V

SECONDARY CONTROL: R2A20124AFP

Forced synchronous rectification

on voltage

Von-sec-cont

4.6

—

—

V

CS = 1 V

Forced synchronous rectification

off voltage

Voff-sec-cont

—

—

0.4

V

CS = 0 V

Input bias current-1

5

10

20

A

CS = 0 V, SEC-CONT = 2.1 V

Input bias current-2

10

20

40

A

CS = 1 V, SEC-CONT = 2.1 V

Current hysteresis

5

10

20

A

Notes: 1. Tpd-cs is defined as;

Tpd-cs

CS

OUT-C/D

0

1.57 V

50%

50%

OUT-D

OUT-E

50%

50%

OUT-C

OUT-F

50%

50%