ZXLD1352 查看數據表（PDF） - Zetex => Diodes

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ZXLD1352

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

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ZXLD1352

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

Symbol Parameter

Conditions

Min. Typ. Max. Unit

DPWM(LF) Duty cycle range of PWM signal

PWM frequency 100Hz - 1KHz 0.01

1

applied to ADJ pin during PWM

PWM amplitude= VREF

dimming mode

Measured on ADJ pin

Brightness control range

1000:1

fLX

Operating frequency

(See graphs for more detail)

ADJ pin floating

L=100µH (0.82⍀)

IOUT=350mA @ VLED=3.4V

Driving 1 LED

250

KHz

TONmin

TOFFmin

fLXmax

Minimum switch ‘ON’ time

LX switch ‘ON’

Minimum switch ‘OFF’ time

LX switch ‘OFF’

Recommended maximum operating

frequency

200

ns

200

ns

1

MHz

DLX

Recommended duty cycle range of

output switch at fLXmax

TPD

Internal comparator propagation

delay

0.3

0.7

50

ns

NOTES:

(*) Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified over

a -40°C to +105°C temperature range, are guaranteed by design, characterization and process control.

(†) 100% brightness corresponds to VADJ = VADJ(nom) = VREF. Driving the ADJ pin above VREF will increase the VSENSE

threshold and output current proportionally.

Pin description

Name

LX

GND

ADJ

ISENSE

VIN

Pin No.

1

2

3

4

5

Description

Drain of NDMOS switch

Ground (0V)

Multi-function On/Off and brightness control pin:

• Leave floating for normal operation.(VADJ= VREF =1.25V giving nominal average output current

IOUTnom=0.1/RS)

• Drive to voltage below 0.2V to turn off output current

• Drive with DC voltage (0.3V<VADJ<2.5V) to adjust output current from 25% to 200%(†) of IOUTnom

• Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.

Adjustment range 1% to 100% of IOUTnom for 100Hz < f < 1KHZ

• Connect a capacitor from this pin to ground to define soft-start time. Soft-start time is

approx.0.5ms/nF)

Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom=0.1/RS

(Note: RSMIN=0.27⍀ with ADJ pin open-circuit)

Input voltage (7V to 30V). Decouple to ground with 1µF or higher X7R ceramic capacitor close to

device

Ordering information

Device

ZXLD1352ET5TA

Reel size

(mm)

180

Reel width

(mm)

8

Quantity per reel

3,000

Device mark

1352

Issue 1 - August 2008

3

© Diodes Incorporated 2008

www.zetex.com

www.diodes.com

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