ZLED7720

High Current 40V LED Driver with Internal Switch

Data Sheet

August 12, 2011

© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.2

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

7 of 27

1.3

Electrical Parameters

Production testing of the chip is performed at 25°C unless otherwise stated. Functional operation of the chip and

specified parameters at other temperatures are guaranteed by design, characterization, and process control.

No.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNIT

1.3.1

Quiescent supply current

Output off—ADJ pin

grounded

90

120

160

µA

Output switching—ADJ pin

floating

450

600

µA

1.3.2

Mean current sense

threshold voltage

97

100

103

mV

1.3.3

Sense threshold hysteresis

±15

%

1.3.4

8

µA

1.3.5

Internal reference voltage

measured at ADJ pin

ADJ pin floating

1.2

V

1.3.6

and ADJ pin

500

K

1.3.7

External DC brightness

control voltage on ADJ pin

0.3

1.2

V

1.3.8

DC on-off control voltage on

ADJ pin for switching

ZLED7x20 from active state

to quiescent state

0.15

0.2

0.25

V

1.3.9

DC off-on control voltage on

ADJ pin for switching

ZLED7x20 from quiescent

state to active state

0.2

0.25

0.3

V

1.3.10

LX switch continuous

current

ZLED7020

1.2

A

ZLED7320

1.0

A

ZLED7520

0.75

A

ZLED7720

0.35

A

1.3.11

LX switch leakage current

1

µA

1.3.12

LX switch on resistance

0.27

0.4

1.3.13

Minimum switch on time

LX switch on

200

ns

1.3.14

Minimum switch off time

LX switch off

200

ns

1.3.15

Dimming rate

1 LED, f =100Hz, Vin=15V,

L1 = 27

µH

1200:1

1.3.16

Recommended operating

frequency maximum

1

MHz

1.3.17

Recommended output

switch duty cycle range at

0.3

0.9