ZXLD1352 データシートの表示（PDF） - Zetex => Diodes

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ZXLD1352

350mA LED driver with internal switch and enhanced PWM dimming range

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ZXLD1352

Absolute maximum ratings (voltages to GND unless otherwise stated)

Input voltage (VIN)

-0.3V to +30V (40V for 0.5 sec)

ISENSE voltage (VSENSE)

+0.3V to -5V (measured with respect to VIN)

LX output voltage (VLX)

-0.3V to +30V (40V for 0.5 sec)

Adjust pin input voltage (VADJ)

-0.3V to +6V

Switch output current (ILX)

500mA

Power dissipation (Ptot)

450mW

(Refer to package thermal de-rating curve on page 18)

Operating temperature (TOP)

-40 to 105°C

Storage temperature (TST)

-55 to 150°C

Junction temperature (Tj MAX)

150°C

These are stress ratings only. Operation above the absolute maximum rating may cause device failure. Operation at

the absolute maximum ratings, for extended periods, may reduce device reliability.

Thermal resistance

Junction to ambient (R⍜JA)

200°C/W

Electrical characteristics (test conditions: VIN=12V, Tamb=25°C unless otherwise stated) (*)

Symbol Parameter

Conditions

Min. Typ. Max. Unit

VIN

Input voltage

VSU

Internal regulator start-up threshold VIN rising

7

30 V

4.8

V

IINQoff

Quiescent supply current

with output off

ADJ pin grounded

20

30 µA

IINQon

Quiescent supply current

with output switching

ADJ pin floating

f=250kHz

250

500 µA

VSENSE

Mean current sense threshold

voltage

(defines LED current setting

accuracy)

Measured on ISENSE pin with

95

respect to VIN

VADJ =1.25V

100

105 mV

VSENSEHYS Sense threshold hysteresis

ISENSE

ISENSE pin input current

VREF

Internal reference voltage

VSENSE =VIN -0.1

Measured on ADJ pin with

pin floating

±15

%

1.25

10 µA

1.21

1.25

1.29 V

⌬VREF /⌬T

VADJ

Temperature coefficient of VREF

External control voltage range on

ADJ pin for dc brightness control (†)

50

ppm/°C

0.3

2.5 V

VADJoff

DC voltage on ADJ pin to switch

device from active (on) state to

quiescent (off) state

VADJ falling

0.15

0.2

0.25 V

VADJon

DC voltage on ADJ pin to switch

device from quiescent (off) state to

active (on) state

VADJ rising

0.2

0.25

0.3 V

RADJ

ILXmean

RLX

Resistance between ADJ pin and

VREF

Continuous LX switch current

LX Switch ‘On’ resistance

35

65 k⍀

0.37 A

1.5

2⍀

ILX(leak)

LX switch leakage current

1 µA

Issue 1 - August 2008

2

© Diodes Incorporated 2008

www.zetex.com

www.diodes.com

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