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PDF ZXLD1356Q Data sheet ( Hoja de datos )
| Número de pieza | ZXLD1356Q | |
| Descripción | AUTOMOTIVE GRADE 60V 550mA LED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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ZXLD1356Q
AUTOMOTIVE GRADE 60V 550mA LEDQDRIVER
Description
The ZXLD1356Q 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.
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 Pulse Width Modulated
(PWM) signal to the ADJ pin.
The ZXLD1356Q is qualified to AECQ100 Grade 1 enabling operation in
ambient temperatures from -40°C to +125°C and is Automotive
Compliant supporting PPAPs.
Features
Typically Better than 0.8% Output Current Accuracy
Simple with Low Part Count
Single Pin On/Off and Brightness Control Using DC Voltage or
PWM
PWM Resolution Up to 1000:1
High Efficiency (Up to 97%)
Wide Input Voltage Range: 6V to 60V
Inherent Open-Circuit LED Protection
Green Molding Thermally Enhanced TSOT25
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Automotive Grade
Qualified to AEC-Q100 Grade 1
Supports PPAP documents (Note 4)
Pin Assignments
(TOP VIEW)
LX 1
GND 2
5 VIN
ADJ 3
TSOT25
4 ISENSE
(TOP VIEW)
LX 1
6 VIN
GND 2
5 GND
ADJ 3
4 ISENSE
U-VD-FDNFN33003300--66
Applications
Automotive Lighting:
Internal Door Lights
Rear Fog Lamps
Position Lights
Typical Applications Circuit
Notes: 1.
2.
3.
4.
No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
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.
Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally the
same, except where specified. For more information, please refer to http://www.diodes.com/quality/product_compliance_definitions/.
ZXLD1356Q
Document number: DS37077 Rev. 2 - 2
1 of 28
www.diodes.com
October 2015
© Diodes Incorporated
1 page  
ZXLD1356Q
Q
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)
VIN
LX voltage
SENSE voltage
0V
VIN
230mV
Toff Ton
170mV
Coil current
Comparator
input voltage
0V
VADJ
0.15VADJ
200mV
VSENSE-
VSENSE+
IOUTnom +15%
IOUTnom
IOUTnom -15%
0.15VADJ
Comparator
output
5V
0V
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 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 15% 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 ± 15%.
Switching Thresholds
With VADJ = VREF, the ratios of R1, R2 and R3 define an average VSENSE switching threshold of 200mV (measured on the ISENSE pin with respect
to VIN). The average output current IOUTnom is then defined by this voltage and RS according to:
IOUTnom = 200mV/RS
Nominal ripple current is ±30mV/RS
ZXLD1356Q
Document number: DS37077 Rev. 2 - 2
5 of 28
www.diodes.com
October 2015
© Diodes Incorporated
5 Page 
ZXLD1356Q
Q
Typical Operating Conditions (Cont.)
0.6 40
ZXLZDXL1D315365Q6 OOuuttppuuttCCuurrrerennt t
L = 150µH
0.6 20
0.6 00
0.5 80
0.5 60
0.5 40
0.5 20
0.5 00
0
1 LED
10 %
8%
6%
4%
2%
0%
-2%
-4%
-6%
-8%
-10%
0
1 LED
10 0%
95 %
90 %
85 %
80 %
75 %
70 %
65 %
60 %
55 %
50 %0
1 LED
10
3 LEDs
20
5 LEDs
30
Supply Voltage (V)
7 LEDs 9 LEDs
40
11 LEDs
50
13 LEDs
ZXZLXDLD11335566QOOutuptuptuCtuCrruernret nDtevDiaetvioianti(oNnor(Nmoalrimzeadl)ized)
L = 150µH
60
15 LEDs
10
3 LEDs
20
5 LEDs
30
Supply Voltage (V)
7 LEDs 9 LEDs
40
11 LEDs
50
13 LEDs
60
15 LEDs
ZXZLXDL1D3153656QEEffficficieinecnycy
L = 150µH
10
3 LEDs
20
5 LEDs
30
Supply Voltage (V)
7 LEDs 9 LEDs
40
11 LEDs
50
13 LEDs
60
15 LEDs
ZXLD1356Q
Document number: DS37077 Rev. 2 - 2
11 of 28
www.diodes.com
October 2015
© Diodes Incorporated
11 Page | ||
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| PDF Descargar | [ Datasheet ZXLD1356Q.PDF ] | |
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