LX1570/1571

PRODUCT DA T ABOOK 1996/1997

3

Copyright © 1997

Rev. 0.9.3

1/97

Input Range

LX1570

V

CSI

LX1571

Input Current

LX1570

I

CSB

LX1571

C.S. Amplifier Gain

LX1570

A

CS

LX1571

Minimum Current Threshold Voltage

LX1570

V

CSMIN

LX1571

C.S. Delay to Driver Output

10% Overdrive

C.L. Pulse-By-Pulse Threshold Voltage

LX1570

V

CLP

LX1571

C.L. Hiccup Threshold Voltage

LX1570

V

CLH

LX1571

Voltage Hiccup Threshold

V

HCCP

Initial Accuracy

f

O

C

, T

Over Temp, measured at pin 6

Line Voltage Stability

∆f

OL

Charging Current

I

CHG

Discharging Current

I

DISCH

Leakage Current

I

LK

C.S.

Ramp PK to PK

V

RPP

C.S.

C.S.

ELECTRICAL CHARACTERISTICS

Reference Section

Parameter

Symbol

Test Conditions

Initial Accuracy

V

RI

T

Line Regulation

∆V

RL

11V < V

Temp Stability

∆V

RT

Note 2

Units

LX1570/1571

Min.

Typ.

Max.

2.475

2.500

2.525

V

±1

%

±1.5

%

Timing Section

90

100

110

kHz

85

100

115

kHz

±1

%

3mA

3.5

mA

4µA

0.6

V

6V

Error Amp / Soft Start Comp Section

Transconductance

g

m

Input Bias Current

I

B

Open Loop Gain

A

VOL

Output Sink Current

I

EA(SINK)

V

Output Source Current

I

EA(SOURCE)

V

Output HI Voltage

V

COMP-HI

Output LO Voltage

V

COMP-LO

Slew Rate

S

0.005

µ

Ω

0.1

1

µA

60

70

dB

200

400

µA

200

400

µA

5.1

V

0.8

V

1

V/µSec

(Unless otherwise specified, these specifications apply over the ranges T

LX1570I/1571I, and T

V

Typ. number represents T

Soft-Start Section

Soft Start Timing Factor

K

SS

Soft Start Discharge Current

I

SS-DIS

35

50

65

ms/µF

TBD

mA

Current Sense Section

-0.8

V

-0.3

6

V

25

µA

1µA

-13.5

-15

-16.5

V/V

2.7

3

3.3

V/V

-50

mV

250

mV

100

200

ns

-0.18

-0.2

-0.22

V

0.9

1

1.1

V

-0.3

V

1.5

V

2V

Note 2. Although this parameter is guaranteed, it is not 100% tested in production.