ZLED7010 Datasheet

© 2016 Integrated Device Technology, Inc.

18

April 20, 2016

RNTC

RTH

ADJI

ADJO

GND

ZLED7010

R2

R3

NTC

100pF

100pF

100pF

100pF

RNTC

RTH

ADJI

ADJO

GND

ZLED7010

R4

RNTC

VIN

RTH

ADJI

ADJO

GND

ISENSE

LX

ZLED7010

VS

n1 LED

L1-1

R3

NTC

C1-1

C2

R2

RS-1

D1-1

RNTC

VIN

RTH

ADJI

ADJO

GND

ISENSE

LX

ZLED7010

n3 LED

L1-3

C1-3

RS-3

D1-3

RNTC

VIN

RTH

ADJI

ADJO

GND

ISENSE

LX

ZLED7010

n2 LED

L1-2

C1-2

RS-2

D1-2

VS

VS

5

Chaining Multiple ZLED7010 ICs

Figure 5.1 shows a typical circuit for chaining multiple ZLED7010s using the ADJI and ADJO pins and a

temperature sensing network of R2, R4, and R3, which is an NTC component. Note that only one temperature

sensing network is needed.

When R3+R4 > R2, VADJO = VADJI.

When R3+R4 < R2, the ADJO pin outputs the ADJI input voltage with temperature compensation information.

Figure 5.1

ZLED7010 Chain Connections

In Figure 5.2, note that each ZLED7010 can drive up to three slave ICs in the next stage. Using more than three

stages to maintain current coherence is not recommended. Up to thirteen ZLED7010 can be connected in one

system.

Figure 5.2

ZLED7010 System Application