ZXLD1352

ZXLD1352

Document number: DS33469 Rev. 3 - 2

4 of 21

www.diodes.com

December 2010

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Internal regulator start-up threshold

4.8

V

Quiescent supply current

with output off

ADJ pin grounded

20

30

µA

Quiescent supply current

with output switching

ADJ pin floating

f = 250kHz

250

500

µA

Mean current sense threshold voltage

(defines LED current setting accuracy)

95

100

105

mV

Sense threshold hysteresis

±15

%

1.25

10

µA

Internal reference voltage

Measured on ADJ pin with pin floating

1.21

1.25

1.29

V

ΔV

50

ppm/°C

External control voltage range on ADJ

pin for dc brightness control

1

0.3

2.5

V

DC voltage on ADJ pin to switch device

from active (on) state to quiescent (off)

state

0.15

0.2

0.25

V

DC voltage on ADJ pin to switch device

from quiescent (off) state to active (on)

state

0.2

0.25

0.3

V

35

65

k

Ω

Continuous LX switch current

0.37

A

LX Switch ‘On’ resistance

1.5

2

Ω

LX switch leakage current

1

µA

Duty cycle range of PWM signal

applied to ADJ pin during PWM

dimming mode

PWM frequency 100Hz – 1kHz

Measured on ADJ pin

0.001

1

Brightness control range

1000:1

Operating frequency

(See graphs for more detail)

ADJ pin floating

L=100µH (0.82V)

Driving 1 LED

250

kHz

Internal comparator propagation delay

50

ns

Notes:

1. 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.

proportionally.