ZXLD1320DCATC Diodes Zetex, ZXLD1320DCATC Datasheet

IC LED DRVR WHITE BCKLGT 14-TDFN

ZXLD1320DCATC

Manufacturer Part Number
ZXLD1320DCATC
Description
IC LED DRVR WHITE BCKLGT 14-TDFN
Manufacturer
Diodes Zetex
Type
Backlight, White LEDr
Datasheet

Specifications of ZXLD1320DCATC

Topology
PWM, Step-Down (Buck)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Automotive
Type - Secondary
High Brightness LED (HBLED)
Frequency
600kHz
Voltage - Supply
4 V ~ 18 V
Mounting Type
Surface Mount
Package / Case
14-TDFN
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
1.5A
Internal Switch(s)
Yes
Efficiency
85%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Other names
ZXLD1320DCATR
ZXLD1320
Buck mode DC-DC converter for LED driving with
1.5A output and current control
Description
The
converter, with an internal switch, designed
for driving single or multiple LEDs in series up
to a total of 1.5A output current.
Applications cover both commercial and
automotive environments with input voltages
ranging from 4V to 18V. Depending upon
supply voltage and external components, this
can provide up to 24W of output power.
The device employs a variable 'on' and 'off'
time control scheme with adjustable peak
switch current limiting and operates in the
step-down (Buck) operating mode, offering
higher power efficiency and lower system
cost than conventional PFM circuitry.
The device includes the DC-DC converter, a
high-side current monitor and an NPN
switching transistor to provide an integrated
solution offering small PCB size, competitive
cost/performance, high power efficiency of
DC-DC
brightness/reliability. More importantly, it
retains design flexibility to add customer
specific features.
Features
Note* : Using standard external components as specified under electrical characteristics. Efficiency is dependent upon
external component types and values. Higher efficiency is possible with alternative coils.
Issue 1 - January 2008
© Zetex Semiconductors plc 2008
Step-down LED driver
4V to 18V input voltage range
Up to 1.5A output current
Typical efficiency
User-defined thermal control of LED
output current using external thermistor
High output current stability over input
voltage and temperature
12
LED current adjustable from 100%
down to 2%
Adjustable soft-start
Power 'OK' flag output
Capable of driving 4 LEDs in series
μ
ZXLD1320
A typical standby current
conversion
is
#
> 85%
an
and
inductive
maximum
DC-DC
LED
1
The feedback control circuitry inside the
ZXLD1320 provides excellent load and current
regulation, resulting in very stable LED current
over the full operating voltage and temperature
range.
The LED current can be adjusted from 100%
down to 10% of the set value by applying a dc
voltage to the ADJ pin and down to 1% by
applying a PWM signal. An on-chip LED
protection circuit also allows output current to
be reduced linearly above a predetermined
threshold
thermistor at the TADJ pin.
External resistors set nominal average LED
current and coil peak current independently.
The 'Power-OK' (POK) output flag remains high
during normal operation, but switches low if the
switch transistor remains on for more than
500
or fault condition. The POK output may be used
to drive an LED or the input of an MCU.
The device can be shut down by applying a
continuous low level dc voltage to the ADJ pin.
Applications
Low voltage halogen lamp replacement
with LEDs
High power LED flashlights
LED back-up lighting
General LED lighting
Automotive lighting
μ
s. This provides indication of a low battery,
temperature
using
www.zetex.com
an
external

Related parts for ZXLD1320DCATC

ZXLD1320DCATC Summary of contents

Page 1

ZXLD1320 Buck mode DC-DC converter for LED driving with 1.5A output and current control Description The ZXLD1320 is an inductive converter, with an internal switch, designed for driving single or multiple LEDs in series total of 1.5A ...

Page 2

Pin connections (top-view) Package 14-Pin DFN with exposed pad 4mm x 3mm 0.50mm pitch 1.5W @T =70°C A Block diagram Issue 1 - January 2008 © Zetex Semiconductors plc 2008 Package view DFN14 Package (bottom view). 45° chamfer denotes Pin ...

Page 3

Absolute maximum ratings (Voltages relative to GND unless otherwise stated) Operating temperature (Top) Storage temperature (Tst) Junction temperature (Tj) Package power dissipation (Ptot) DFN-14 with Exposed Pad: 4mmx3mm, 0.5mm Pitch DC-DC Converter Supply voltage (VIN) POK ADJ CFB ISENSE TADJ ...

Page 4

Pin description Name Pin Description # ADJ 1 Adjust input • Leave floating, or connect to VREF to set 100% output current. • Drive with dc voltage. (50mV<VADJ< VREF) to adjust output current • Drive with low frequency (200Hz) PWM ...

Page 5

Electrical characteristics ( DC-DC converter supply parameters Symbol Parameter V Supply voltage IN Iq Quiescent current I Standby current STBY V Internal reference voltage REF T Internal reference temperature CO(REF) coefficient. NOTES: (a) Production testing of the device is performed ...

Page 6

DC-DC converter output parameters Symbol Parameter Toff(100) Discharge pulse width Toff(10) Discharge pulse width f Maximum operating LXmax frequency V POK flag high level output OH(POK) voltage V POK flag low level output OL(POK) voltage T POK assertion delay time ...

Page 7

High-side current monitor Symbol Parameter V Supply voltage MVIN V Sense voltage MON I Input current M_LOAD TCO Temperature coefficient (MON) BW Bandwidth Gm Transconductance Iout/ VMON Acc Accuracy Reference current monitor Symbol Parameter V Adjust voltage ADJ TCO Temperature ...

Page 8

... OUT output current V IN Eff (e) Efficiency NOTES: (e) System parameter only. This value is dependent upon external components and circuit configuration. Ordering information Device Reel size (mm) ZXLD1320DCATC 33.02 Issue 1 - January 2008 © Zetex Semiconductors plc 2008 Conditions V >4V IN 4V<VIN<18V, Iout=1A, V =100mV, ADJ 4V<VIN<18V, ...

Page 9

Device description The ZXLD1320 is a buck mode inductive DC-DC converter, with an internal switch, designed for driving single or multiple LEDs in series total of 1.5A output current. Depending upon supply voltage (VIN), LED forward voltage ...

Page 10

ADJ pin The ADJ pin is connected to the internal 500mV reference (VREF) via a 100k resistor. This biases the ADJ pin to the reference voltage and defines nominal 100% LED current. The ADJ pin can be overdriven with an ...

Page 11

Application notes Setting peak coil current The peak current in the coil is set by the resistor (Rsense) between the switch emitter and ground according SWpeak Rsense The minimum peak current will depend on operating ...

Page 12

PWM control A wider dimming range can be achieved by applying a PWM control signal to the ADJ pin to turn the device on and off, giving an average output current proportional to the duty cycle of the control signal. ...

Page 13

Thermal compensation of LED current High-luminance LEDs often need to be supplied with a temperature compensated current in order to maintain stable and reliable operation at high temperatures. This is usually achieved by reducing the LED current proportionally from its ...

Page 14

Typical operating conditions Inductive converters can operate in either CONTINUOUS mode, where current always flows in the inductor, but rises during the ON period and falls during the OFF period, or DISCONTINUOUS mode, where the current falls to zero during ...

Page 15

LED(s). At this point the transistor switches off and the coil current continues to flow in the LED(s) via Schottky diode D1. The LED current is sensed by R3 and the controller varies this until ...

Page 16

Additional notes Note that the ON time is set by the time it takes the coil to reach the peak current. This peak value is reduced by the control loop to give the desired LED power, so the ON time ...

Page 17

Package outline - TDFN1443 60.3938 E PIN 1 DOT BY MARKING DIM Inches Min Max A 0.0276 0.0315 A1 0.00 0.002 A3 0.008 REF. b 0.0079 0.0118 D 0.1555 0.1594 Note: Controlling dimensions are in millimeters. Approximate dimensions are provided ...

Page 18

Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The ...

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