ZXLD1350

ZXLD1350

Document number: DS33468 Rev. 7 - 2

4 of 22

www.diodes.com

November 2010

© Diodes Incorporated

A Product Line of

Diodes Incorporated

(*)

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

Internal regulator start-up threshold

4.8

V

Quiescent supply current with output off

ADJ pin grounded

15

20

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

50

ppm/°C

External control voltage range on ADJ pin for

DC brightness control

(†)

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

135

250

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 low frequency PWM dimming mode

PWM frequency <500Hz

Measured on ADJ pin

0.01

1

Brightness control range

100:1

Duty cycle range of PWM signal applied to ADJ

pin during high frequency PWM dimming mode

PWM frequency <10kHz

Measured on ADJ pin

0.16

1

Brightness control range

5:1

Operating frequency

(See graphs for more details)

ADJ pin floating

L = 100H (0.82V)

Driving 1 LED

250

kHz

Start up time

(See graphs for more details)

Time taken for output

current to reach 90% of final

value after voltage on ADJ

pin has risen above 0.3V.

500

µs

Internal comparator propagation delay

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.

output current proportionally.