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PDF ZXLD1362 Data sheet ( Hoja de datos )
| Número de pieza | ZXLD1362 | |
| Descripción | 60V 1A LED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
ZXLD1362
60V 1A LED DRIVER WITH AEC-Q100
Description
The ZXLD1362 is a continuous mode inductive step-down converter
with integrated switch and high side current sense.
It operates from an input supply from 6V to 60V driving single or
multiple series connected LEDs efficiently externally adjustable
output current up to 1A.
The ZXLD1362 has been qualified to AEC-Q100 Grade 1 enabling
operation in ambient temperatures from -40°C to +125°C.
The output current can be adjusted by applying a DC voltage or a
PWM waveform. 100.1 adjustment of output current is possible
using PWM control.
Applying 0.2V or lower to the ADJ pin turns the output off and
switches the device into a low current standby state.
Features
• Simple low parts count
• Single pin on/off and brightness control using DC voltage or
PWM
• High efficiency (up to 95%)
• Wide input voltage range: 6V to 60V
• Up to 1MHz switching frequency
• Qualified to AEC-Q100 Grade 1
• Automotive Grade version available (ZXLD1362Q)
• Typical 2% output current accuracy
• Thermally enhanced TSOT25: θJA 82°C/W
• Available in Green Molding
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
LX
GND
ADJ
(Top View)
TSOT25
VIN
ISENSE
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Application Circuit
VIN RS L1
24V
0.1Ω
68µH
C1
4.7µF
VIN SET
C2
100nF
GND
ADJ
ZXLD1362
GND
LX
ZXLD1362
Document number: DS33472 Rev. 6 - 2
1 of 25
www.diodes.com
March 2014
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
ZXLD1362
Device Description
The device, in conjunction with the coil (L1) and current sense resistor (RS), forms a self-oscillating continuous-mode buck converter.
Device operation (refer to Figure 1 - Block diagram and Figure 2 Operating waveforms)
Figure 2 Theoretical Operating Waveforms
Operation can be best understood by assuming that the ADJ pin of the device is unconnected and the voltage on this pin (VADJ) appears directly
at the (+) input of the comparator.
When input voltage VIN is first applied, the initial current in L1 and RS is zero and there is no output from the current sense circuit. Under this
condition, the (-) input to the comparator is at ground and its output is high. This turns MN on and switches the LX pin low, causing current to flow
from VIN to ground, via RS, L1 and the LED(s). The current rises at a rate determined by VIN and L1 to produce a voltage ramp (VSENSE) across
RS. The supply referred voltage VSENSE is forced across internal resistor R1 by the current sense circuit and produces a proportional current in
internal resistors R2 and R3. This produces a ground referred rising voltage at the (-) input of the comparator. When this reaches the threshold
voltage (VADJ), the comparator output switches low and MN turns off. The comparator output also drives another NMOS switch, which bypasses
internal resistor R3 to provide a controlled amount of hysteresis. The hysteresis is set by R3 to be nominally 10% of VADJ.
When MN is off, the current in L1 continues to flow via D1 and the LED(s) back to VIN. The current decays at a rate determined by the LED(s)
and diode forward voltages to produce a falling voltage at the input of the comparator. When this voltage returns to VADJ, the comparator output
switches high again. This cycle of events repeats, with the comparator input ramping between limits of VADJ ± 10%.
ZXLD1362
Document number: DS33472 Rev. 6 - 2
5 of 25
www.diodes.com
March 2014
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
ZXLD1362
Typical Characteristics (cont.)
1100
10 90
10 80
10 70
10 60
10 50
10 40
10 30
10 20
10 10
10 00
0
10 20
1 LED
3 LED 5 LED
ZXLD1362 Output Current
L = 150µH
30 40
Supply Voltage (V)
7 LED
9 LED
50
11 LED
60 70
13 LED 15 LED
10 %
8%
6%
4%
2%
0%
-2%
-4%
-6%
-8%
-10%
0
ZXLD1362 Output Current
L = 150µH
10 20
1 LED
3 LED 5 LED
30 40
Supply Voltage (V)
7 LED
9 LED
50
11 LED
60 70
13 LED 15 LED
10 0%
ZXLD1362 Efficiency
L = 150µH
90 %
80 %
70 %
60 %
50 %
0
10 20
1 LED
3 LED 5 LED
30 40
Supply Voltage (V)
7 LED
9 LED
ZXLD1362
Document number: DS33472 Rev. 6 - 2
11 of 25
www.diodes.com
50
11 LED
60 70
13 LED 15 LED
March 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ZXLD1362.PDF ] | |
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