ZXLD1356ET5TA Diodes Zetex, ZXLD1356ET5TA Datasheet

IC LED DRIVR WHITE BCKLGT TSOT-5

ZXLD1356ET5TA

Manufacturer Part Number
ZXLD1356ET5TA
Description
IC LED DRIVR WHITE BCKLGT TSOT-5
Manufacturer
Diodes Zetex
Type
Backlight, White LEDr
Datasheet

Specifications of ZXLD1356ET5TA

Topology
PWM, Step-Down (Buck)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Automotive, Backlight
Type - Secondary
High Brightness LED (HBLED), White LED
Frequency
500kHz
Voltage - Supply
6 V ~ 60 V
Voltage - Output
60V
Mounting Type
Surface Mount
Package / Case
TSOT-23-5, TSOT-5, TSOP-5
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
550mA
Internal Switch(s)
Yes
Efficiency
97%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ZXLD1356ET5TR

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Features
• Typically better than 0.8% output current accuracy
• Simple and with low part count
• Single pin on/off and brightness control using DC voltage
• PWM resolution up to 1000:1
• High efficiency (up to 97%)
• Wide input voltage range: 6V to 60V
• Inherent open-circuit LED protection
• Available in thermally enhanced packages
• Available in Green molding (no Br, Sb) with lead free
• Qualified to AEC-Q100 Grade 1
• Low voltage halogen replacement LEDs
• Automotive lighting
• Low voltage industrial lighting
• LED back-up lighting
• Illuminated signs
• Emergency lighting
• SELV lighting
• Refrigeration lights
Description
The ZXLD1356 is a continuous mode inductive step-down
converter, designed for driving single or multiple series
connected LEDs efficiently from a voltage source higher than
the LED voltage. The device operates from an input supply
between 6V and 60V and provides an externally adjustable
output current of up to 550mA. Depending upon supply
voltage and external components, this can provide up to
30 watts of output power.
The ZXLD1356 has been qualified to AECQ100 Grade 1
enabling operation in ambient temperatures from -40 to
125°C
Output current can be adjusted above, or below the set
value, by applying an external control signal to the 'ADJ' pin.
Enhanced output current dimming can be achieved by
applying a PWM signal to the ‘ADJ’ pin.
Applications
ZXLD1356
Document number: DS33470 Rev. 3 - 2
or PWM
o
o
finish/RoHS compliant
o
DFN3030-6
TSOT23-5
TSOT23-5
ZXLD1356ET5TA
θ
θ
JA
JA
44° C/W
82° C/W
www.diodes.com
1 of 29
Pin Assignments
Typical Application Circuit
 
V
IN
(24V)
GND
C1
100nF
GND
ADJ
4.7µF
60V 550mA LED DRIVER with AEC-Q100
LX
GND
Diodes Incorporated
ADJ
LX
A Product Line of
1
2
3
ADJ
(TOP VIEW)
V
TSOT23-5
DFN3030-6
IN
Top View
D1
0.36V
Rs
ZXLD1356
I
6
5
4
SENSE
GND
I
V
GND
SENSE
IN
V
I
SENSE
IN
© Diodes Incorporated
L1
ZXLD1356
December 2010
LX

Related parts for ZXLD1356ET5TA

ZXLD1356ET5TA Summary of contents

Page 1

... TSOT23-5 82° C • Available in Green molding (no Br, Sb) with lead free finish/RoHS compliant • Qualified to AEC-Q100 Grade 1 TSOT23-5 ZXLD1356ET5TA o Applications • Low voltage halogen replacement LEDs • Automotive lighting • Low voltage industrial lighting • LED back-up lighting • Illuminated signs • Emergency lighting • ...

Page 2

Block Diagram 4.7μF Adj 3 1.25V Gnd 2 Figure 1. Block diagram – Pin connections shown for TSOT23-5 package Name TSOT23-5 DFN3030 Drain of NDMOS switch GND Ground (0V) Multi-function On/Off ...

Page 3

Absolute Maximum Ratings Symbol Parameter V Input Voltage Voltage SENSE SENSE V LX Output Voltage LX V Adjust Pin Input Voltage ADJ I Switch Output Current LX Power Dissipation P (Refer to Package thermal de-rating curve on ...

Page 4

Electrical Characteristics (Test conditions: V Symbol Parameter V Internal regulator start-up threshold SU V Internal regulator shutdown threshold SD I Quiescent supply current with output off INQoff Quiescent supply current with output switching I INQon (Note 3) Mean current sense ...

Page 5

Device Description The device, in conjunction with the coil (L1) and current sense resistor (R converter. Device operation (refer to Figure 1 - Block diagram and Figure 2 Operating waveforms voltage SENSE voltage Coil ...

Page 6

Device Description (Continued) Switching thresholds With the ratios of R1, R2 and R3 define an average V ADJ REF pin with respect The average output current 200mV/R OUTnom S ...

Page 7

Actual operating waveforms [V =15V Normal operation. Output current (Ch3) and LX voltage (Ch2) Actual operating waveforms [V =30V Normal operation. Output current (Ch3) and LX voltage (Ch2) Actual operating waveforms [V =60V Normal ...

Page 8

Typical Operating Conditions 0.640   0.620 0.600 0.580 0.560 0.540 0.520 0.500 0 1 LED 10 -2% -4% -6% -8% -10 LED 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% ...

Page 9

Typical Operating Conditions 700 600 500 400 300 200 100 LED 100 LED ZXLD1356 Document number: DS33470 Rev (Cont.) ZXLD1356 Switching ...

Page 10

Typical Operating Conditions 0.640 0.620 0.600 0.580   0.560 0.540 0.520 0.500 0 1 LED 10 -2% -4% -6% -8% -10 LED 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% ...

Page 11

Typical Operating Conditions 700 600 500 400 300 200 100 LED 100 LED ZXLD1356 Document number: DS33470 Rev (Cont.) ZXLD1356 Switching ...

Page 12

Typical Operating Conditions   0.640 0.620 0.600 0.580   0.560 0.540 0.520 0.500 0 1 LED 10 -2% -4% -6% -8% -10 LED 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% ...

Page 13

Typical Operating Conditions 700 600 500 400 300   200 100 LED 100 LED ZXLD1356 Document number: DS33470 Rev (Cont.) ZXLD1356 ...

Page 14

Typical Operating Conditions 0.640 0.620 0.600 0.580   0.560 0.540 0.520 0.500 0 1 LED 10 -2% -4% -6% -8% -10 LED 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% ...

Page 15

Typical Operating Conditions 700 600 500 400 300   200 100 LED 100 LED 3 LEDs ZXLD1356 Document number: DS33470 Rev ...

Page 16

Typical Operating Conditions 600 500 400 300 200 100 0 0 800 700 600 500 400 300 Output transistor not fully enhanced 200 100 0 0 1.243 1.2425 1.242 1.2415 1.241 1.2405 1.24 1.2395 1.239 1.2385 1.238 ...

Page 17

Typical Operating Conditions 2.5 2 1 1.262 1.26 1.258 1.256 1.254 1.252 1.25 1.248 1.246 1.244 -50 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -50 ZXLD1356 Document number: DS33470 Rev ...

Page 18

Application Information Setting nominal average output current with external resistor R The nominal average output current in the LED(s) is determined by the value of the external current sense resistor (R connected between V and I and is given by: ...

Page 19

Application Information (Continued) Output Current Adjustment by PWM Control Directly driving ADJ input A Pulse Width Modulated (PWM) signal with duty cycle D current to a value above or below the nominal average value set by resistor R   PWM ...

Page 20

Application Information (Continued) Shutdown Mode Taking the ADJ pin to a voltage below 0.2V for more than approximately 100µs will turn off the output and supply current to a low standby level of 65µA nominal. Note that the ADJ pin ...

Page 21

Application Information (Continued) V Capacitor Selection IN A low ESR capacitor should be used for input decoupling, as the ESR of this capacitor appears in series with the supply source impedance and lowers overall efficiency. This capacitor has to supply ...

Page 22

Application Information (Continued) Inductor Selection Recommended inductor values for the ZXLD1356 are in the range 68 µH to 220 µH. Higher values of inductance are recommended at higher supply voltages in order to minimize errors due to switching delays, which ...

Page 23

Application Information (Continued) Diode selection For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance Schottky diode* with low reverse leakage at the maximum operating voltage and temperature. They also provide better efficiency than silicon diodes, ...

Page 24

Application Information (Continued) Thermal considerations When operating the device at high ambient temperatures, or when driving maximum load current, care must be taken to avoid exceeding the package power dissipation limits. The graph below gives details for power derating. This ...

Page 25

Application information (Continued) Layout Considerations LX pin The LX pin of the device is a fast switching node, so PCB tracks should be kept as short as possible. To minimize ground 'bounce', the ground pin of the device should be ...

Page 26

Application Information (Continued) Dimming Output Current Using PWM Low frequency PWM mode When the ADJ pin is driven with a low frequency PWM signal (eg 100Hz), with a high level voltage VADJ and a low level of zero, the output ...

Page 27

... Ordering Information Part Package Device mark Code ZXLD1356DACTC 1356 DAC ZXLD1356ET5TA 1356 ET5 Package Outline Dimensions TSOT23-5 ZXLD1356 Document number: DS33470 Rev Reel size Reel width Packaging (inches) (mm) (Note 4) DFN3030 TSOT23 www.diodes.com A Product Line of Diodes Incorporated ZXLD1356 Part Quantity per reel ...

Page 28

Package Outline Dimensions DFN3030-6 PIN 1 DOT BY MARKING SIDE VIEW Millimeters Inches DIM Min. Max. Min. A 0.700 0.800 0.0275 A1 0.000 0.050 0.000 A3 0.203 REF 0.008 b 0.300 0.400 0.0118 D 2.950 3.050 0.116 ZXLD1356 Document number: ...

Page 29

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY ...

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