ZLED7000

40V LED Driver with Internal Switch

Data Sheet

August 12, 2010

© 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.1

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.

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4

Operating Conditions

4.1

Thermal Conditions

Refer to Table 1.1 for maximum package power dissipation specifications for the ZLED7000’s SOT89-5

package. Exceeding these specifications due to operating the chip at high ambient temperatures (see Table

1.2 for maximum operating temperature range) or driving over the maximum load current (see Table 1.1) can

damage the ZLED7000. The ZLED7000 can be used for LED current applications up to750mA when properly

mounted to a high wattage land pattern. Conditions such as operating below the minimum supply voltage or

inefficiency of the circuit due to improper coil selection or excessive parasitic capacitance on the output can

cause excessive chip power dissipation.

4.2

Thermal Shut-Down Protection

The ZLED7000 includes an on-board temperature sensing circuit which stops the output if the junction

exceeds approximately 160°C.

4.3

Open-Circuit Protection

The ZLED7000 is inherently protected if there is an open-circuit in the connection to the LEDs because in this

case, the coil is isolated from the LX pin. This prevents any back EMF from damaging the internal switch due

to forcing the drain above its breakdown voltage.

5

ESD/Latch-Up-Protection

All pins have an ESD protection of >± 2000V according to the Human Body Model (HBM) except for pin 1,

which has a protection level of >± 1000V. The ESD test follows the Human Body Model with 1.5 kΩ/100 pF

based on MIL 883-G, Method 3015.7

Latch-up protection of >± 100mA has been proven based on JEDEC No. 78A Feb. 2006, temperature class 1.