ZXLD383ET5TA datasheet, PDF - EEWORLD Datasheet

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ZXLD383ET5TA: DescriptionLED Driver, 1-Segment, PDSO5, TSOT-23, 5 PIN; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size278KB，10 Pages; ManufacturerZetex Semiconductors; Websitehttp://www.zetex.com/

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ZXLD383ET5TA Overview

LED Driver, 1-Segment, PDSO5, TSOT-23, 5 PIN

ZXLD383ET5TA Parametric

Parameter Name	Attribute value
Maker	Zetex Semiconductors
package instruction	VSSOP,
Reach Compliance Code	unknown
ECCN code	EAR99
Interface integrated circuit type	LED DISPLAY DRIVER
JESD-30 code	R-PDSO-G5
length	2.9 mm
Multiplex display function	NO
Number of functions	1
Number of segments	1
Number of terminals	5
Maximum operating temperature	85 °C
Minimum operating temperature	-20 °C
Package body material	PLASTIC/EPOXY
encapsulated code	VSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
Certification status	Not Qualified
Maximum seat height	1 mm
Maximum supply voltage	3.3 V
Minimum supply voltage	0.9 V
Nominal supply voltage	1.5 V
surface mount	YES
Temperature level	OTHER
Terminal form	GULL WING
Terminal pitch	0.95 mm
Terminal location	DUAL
width	1.6 mm
Base Number Matches	1

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A Product Line of

Diodes Incorporated

ZXLD383

Single or multi cell LED driver with enable/rectifier input for solar

charged lamp applications

Description

Summary

The ZXLD383 is a single or multi cell LED

driver designed for applications requiring

step-up voltage conversion from a very low

input voltage. The IC generates constant

current pulses that are ideal for driving single

or multiple LEDs over a wide range of

operating voltages. It includes an on/off

enable input that can be driven directly from

a photocell array or an open collector/drain

logic output. The enable input features an

ultra-low voltage drop diode to ground,

eliminating the need for a photocell array

isolation diode in Garden Light applications.

The ZXLD383 uses a PFM control technique to

drive an internal switching transistor which

exhibits a low saturation resistance. This

ensures high efficiency, even for input voltages

as low as 1.0V.

The IC can start up under full load and operates

down to an input voltage of below 0.9V.

The ZXLD383 is offered in the space saving

TSOT23-5 package or in die form, offering an

excellent cost vs performance solution for

single cell LED driving applications.

Features

•

85% efficiency

User

adjustable

output current

Single cell operation

Low saturation voltage

TSOT23-5 package

Available also in die form

Simple application circuit

Applications

•

Garden lights

Door/pathway illumination

LED flashlight and torches

LED backlights

White LED driver

Gated boost supply generator

Z XLD 383

EN A

D iode A rray

GN D

VC C

N I MH

1. 2V

VOU T

LE D

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ZXLD383

Device description

The ZXLD383 is a simple PFM, DC-DC controller combined with a high performance internal

switching transistor, enabling the production of a high efficiency boost converter for use in single

cell applications. It includes a dual function Enable input which serves both as an operation

inhibit control and an ultra-low voltage drop isolation diode for battery charging purposes in

Garden Light applications. A block diagram is shown for the ZXLD383 in Figure 1.

VC C

D iode A rray

Z XLD 383

VOU T

EN A

P uls e

C ont rol

N I MH

1. 2V

Dch

LE D

C on

Cof f

R s ens e

GN D

Figure 1 - ZXLD383 block diagram

With power applied and the enable pin held at V

, an oscillator within the pulse control block

forces the internal switching transistor to switch on to start an energy charge cycle. The low

saturation voltage switch pulls the V

OUT

pin close to ground which forces the supply voltage

across the external inductor L1. This causes a current to build up, storing energy in the inductor.

During this phase, switch current and supply voltage are monitored and used by the pulse control

circuit to determine the optimum drive conditions and on-time. At the end of the energy charge

cycle, the internal switch is turned off rapidly, interrupting the current flow through L1 which

causes the voltage on V

OUT

to rise dramatically. When the voltage on V

OUT

reaches the load LED’s

forward (on) voltage, the inductor current is transferred from the internal switch to the LED,

starting the energy discharge cycle. With the voltage across the inductor reversed, the current

flowing through it (and the LED) now falls. When the inductor current reaches zero, the voltage

on the V

OUT

pin falls back towards V

. This action is sensed by the pulse control circuit and is

combined with the output of an off-period timer to initiate the next energy charge cycle. Except

for low level losses, all the energy stored in the inductor during a charge cycle is channelled to

the load LED during the following discharge cycle.

The current fed into the load LED has a sawtooth waveform, the average (DC) value of which is

kept constant by the pulse control circuit for varying supply voltage and temperature. It is

possible to change the output current given by the ZXLD383 by changing the value of inductor

L1. The larger the inductance of L1, the lower the output current. A table/graph showing the

relationship between inductance and output current is given later in this datasheet. Since the

Issue 1 - September 2008

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ZXLD383

output current of the ZXLD383 is a sawtooth waveform, its peak value is substantially larger than

the DC/average value. The table also provides this data.

The internal switching transistor has a minimum collector-emitter breakdown voltage of 20V and

this sets the maximum load voltage allowable. The minimum value is set by a feature of the pulse

control circuit that requires the load voltage to be at least 0.5V greater than V

. (The device will

function with load voltages smaller than this but output current regulation will be impaired.)

Higher than nominal load voltages will lower the average (DC) output current generated for a

given inductor value.

The Enable pin inhibits the operation of the output switch if held at a potential of Vcc-0.8V or

lower. It also includes a diode to ground which allows the input to be wired directly to a photocell

array that will then both enable operation of the converter when in darkness and charge the IC’s

power source in daylight conditions. The diode function is performed by an active circuit that

gives an ultra low forward voltage drop (typically less than 0.1V at 20mA). This allows the use of

a lower output voltage photocell array (lower cost) without degrading performance.

Application Examples

Apart from the Garden Light application circuit shown on the front page of this datasheet, the

ZXLD383 may be used in many other ways. The following circuits and notes show some other

possibilities and give typical performance details.

Standard operating mode

The following circuit demonstrates how few components are required to produce a light source

using the ZXLD383. Operating from a single cell, this simple circuit is suited for use in car key

fobs, novelty products etc. where small size and low cost are critical aspects.

By directly wiring the Ena pin to Vcc, the part is permanently enabled once a power supply is

provided. The ZXLD383 is highly tolerant of supply ripple so no decoupling of Vcc should be

needed in a compactly constructed circuit. Also, the part’s capability of operating with a Vcc

below 0.9V means that this simple circuit will make the best use of available battery capacity.

The attached table shows the average LED currents that can be obtained using a range of inductor

values. Also shown are the peak currents required to achieve the given currents.

Z XLD 383

EN A

VC C

(uH )

LE D

(peak )

(m A )

100

210

330

415

LE D

(avg)

(m A )

8.5

17.3

GN D

VOU T

6.8

LE D

1. 5V

4.7

Note V

LED

= 3.5V

Issue 1 - September 2008

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