R2A20124AFP/R2A20124ASP

Preliminary

R03DS0031EJ0300 Rev.3.00

Page 8 of 12

Mar 11, 2011

Electrical Characteristics

(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

SUPPLY: R2A20124AFP/ASP

Start threshold

VH

7.7

8.4

9.1

V

Shutdown threshold

VL

7.4

8.0

8.6

V

UVLO hysteresis

dVUVL

0.3

0.4

0.5

V

Start-up current

Is

—

90

150

A

Vcc = 7.5 V

Operating current

Icc

—

8

11.5

mA

No load on VREF pin

VREF: R2A20124AFP/ASP

Output voltage

Vref

4.9

5.0

5.1

V

Line regulation

Vref-line

—

0

10

mV

Vcc= 10 V to 16 V

Load regulation

Vref-load

—

6

20

mV

Iref= –1 mA to –20 mA

Temperature stability

dVref/dTa

—

—

ppm/°C

Ta = –40°C to 105°C

OSCILLATOR: R2A20124AFP/ASP

Oscillator frequency

fosc

—

200*

1

—

kHz

Switching frequency

fsw

85

100

115

kHz

Measured on OUT-A, -B

Line stability

fsw-line

–1.5

0

1.5

%

Vcc = 10 V to 16 V

Temperature stability

dfsw/dTa

—

—

%/°C

Ta = –40°C to 105°C

RT voltage

2.5

2.7

2.9

V

SYNC: R2A20124AFP/ASP

Input threshold

2.5

2.85

3.2

V

Output high

3.5

4.0

—

V

RSYNC = 33 k

Output low

—

0.10

0.18

V

RSYNC = 33 k

 to VREF

Minimum input pulse

50

—

—

ns

Output pulse width

—

3.0*

1

—

s

REMOTE: R2A20124AFP

On threshold voltage

1.12

1.32

1.52

V

Off threshold voltage

1.04

1.23

1.42

V

REMOTE hysteresis

dVREMOTE

60

90

120

mV

Input bias current

–100

–50

—

A

REMOTE = 2 V

ERROR AMPLIFIER: R2A20124AFP/ASP

FB(–) input voltage

1.225

1.250

1.275

V

FB(–) and COMP are shorted

FB(–) input current

–2.0

0

2.0

A

FB(–) = 1.25 V

Open-loop DC gain

Av

—

80*

1

—

dB

Unity gain bandwidth

BW

—

2*

1

—

MHz

Output source current

–650

–500

–390

A

FB(–) = 0.75 V, COMP = 2 V

Output sink current

2.0

6.5

—

mA

FB(–) = 1.75 V, COMP = 2 V

Output high voltage

3.7

3.9

—

V

FB(–) = 0.75 V, COMP; open

Output low voltage

—

0.1

0.4

V

FB(–) = 1.75 V, COMP; open

Output clamp voltage *

3

–0.16

–0.07

0.0

V

FB(–) = 0.75 V, COMP; open,

SS = 1 V

Notes: 1. Design specification (reference data)

2. R2A20124AFP: SGND and PGND