ZLED7010 datasheet(1/23 Pages) RENESAS

部件名	ZLED7010

功能描述	40V LED Driver with Temperature Compensation

PDF	23 Pages

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制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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40V LED Driver with

Temperature Compensation

ZLED7010

Datasheet

1

April 20, 2016

RNTC

VIN

RTH

ADJI

ADJO

GND

ISENSE

LX

ZLED7010

VS

n LED

L1

R3

NTC

C1

1

μF

C2

100nF

R2

50k

Ω

RS

D1

47

μH

6 to 40 VDC

1

2

8

5

7

6

3

4

Brief Description

The ZLED7010, one of our ZLED Family of LED control

ICs, is an inductive step-down converter that is optimal

for driving a single LED or multiple LEDs (connected in

series) from a voltage source greater than the voltage

rating of the LED. The ZLED7010 operates in continu-

ous mode. Capable of operating efficiently with voltage

supplies ranging from 6 VDC to 40 VDC, it is ideal for

low-voltage lighting applications. The ZLED7010 mini-

mizes current consumption by remaining in a low-current

standby mode (output is off) until a voltage of

≥0.3V is

applied to the ADJI pin.

In operating mode, the ZLED7010 can source LEDs with

an output current of

≤ 750mA (≤ 30 watts of output

power*) that is externally adjustable. The ZLED7010’s

integrated output switch and high-side current sensing

circuit use an external resistor to adjust the average out-

put current. LED control is achieved via an external con-

trol signal at the ZLED7010’s ADJI pin, implemented as

a pulse-width modulation (PWM) waveform for a gated

output current or a DC voltage for continuous current.

The ZLED7010 provides a temperature compen-

sation function for maintaining stable and reliable

LED operation. LED over-temperature conditions

are detected via a negative temperature coefficient

(NTC) thermistor mounted close to the LEDs. If an

over-temperature condition occurs, the NTC value

reaches the value of a threshold resistor and the

IC reduces LED current automatically. After the

circuit recovers to a safe temperature, current

returns to the set value.

ADJO outputs and ADJI inputs of consecutive ICs

can be interconnected as a driver chain deploying

the temperature compensation information of the

predecessor. This reduces the part count because

only the first stage of the series requires an NTC.

* See section 2.3 and 1.4 for details

Features

• Capable of 95% efficiency*

• Operates in continuous mode with a wide input

range from 6 VDC to 40 VDC

• Integrated 40V power switch

• One-pin on/off or brightness control via DC voltage

or PWM control signal

• Switching frequency:

≤ 1MHz

• Dimming rate: 1200:1 (typical)

• Output current accuracy: 5% (typical)

• Built-in temperature compensation and open-circuit

protection for LEDs

• Thermal shutdown protection for the ZLED7010

• Very few external components needed for operation

• Broad range of applications: outputs up to

≤750mA

• SOP-8 package

Application Examples

• Illuminated LED signs and other displays

• LED traffic and street lighting (low-voltage)

• Architectural LED lighting, including low-voltage

applications for buildings

• Halogen replacement LEDs (low-voltage)

• LED flood-lighting

• LED backlighting

• General purpose exterior and interior LED lighting,

including applications requiring low-voltage

• General purpose low-voltage industrial applications

ZLED7010 Application Circuit

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