ZLED7320 datasheet(1/28 Pages) RENESAS

部件名	ZLED7320

功能描述	High Current 40V LED Driver with Internal Switch

PDF	28 Pages

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制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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1 / 28 page

High Current 40V LED

Driver with Internal Switch

ZLED7x20

Datasheet

1

April 20, 2016

Vin

I SENSE

LX

GND

ZLED7x20

D1

LED

String

Vs = 6 to 40 VDC

(C3)

Rs

L1

(C1)

C2

0.1µF

ADJ

33µH to

220µH

Brief Description

The ZLED7x20 continuous-mode inductive step-

down converter family is part of our line of LED-

control ICs. It is designed for applications requiring

high brightness and high current. It can efficiently

drive a single LED or multiple series-connected

LEDs from a voltage input higher than the LED for-

ward voltage: Vin = 6 to 40 VDC. It provides an

adjustable output current

≤1.2A, which is set via an

external resistor and controlled by the ZLED7x20’s

integrated high-side output current-sensing circuit

and high speed internal 40V power switch. An

external control signal, which can be a DC voltage,

PWM, or microcontroller-generated waveform, on

the ADJ pin can also be used to linearly adjust a

continuous output current or to control a gated out-

put current.

The output can be turned off by applying a voltage

lower than 0.2V to the ADJ pin, which puts the

ZLED7x20 in a low-current standby state.

The ZLED7x20 enables diverse industrial and

consumer

lighting

applications

requiring

high

driving currents, wide operating voltage range,

high efficiency, and variable brightness control. It

offers over-temperature and LED open-circuit pro-

tection. The ZLED7x20 can also minimize bill-of-

material costs because very few external com-

ponents are required for most applications. Only a

resistor, a diode, an inductor, and three capacitors

are needed for a typical basic application.

Features

• Up to 1.2A output current

• Internal 40V power switch

• Wide DC input voltage range 6 to 40 VDC

• Output current accuracy: 3% (typical)

• Dimming ratio: 1200:1

• LED open-circuit protection

• Thermal shutdown protection

Benefits

• High efficiency: up to 98%

• Single pin on/off and brightness control using

DC voltage or PWM

• Very few external components needed for

operation

• Footprint compatible with our ZLED7000

depending on the application.

Available Support

• Evaluation Kit

Physical Characteristics

• Operating junction temperature: -40°C to 125°C

• Switching frequency: up to 1MHz

ZLED7x20 Family Selection Matrix

Product

Max. Current Output

Package

ZLED7020

1.2A

SOT89-5

ZLED7320

1.0A

DFN-5

ZLED7520

0.75A

DFN-5

ZLED7720

0.35A

DFN-5

ZLED7x20 Typical Application Circuit

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