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PDF ZXLD1366Q Data sheet ( Hoja de datos )
| Número de pieza | ZXLD1366Q | |
| Descripción | 60V LED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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ZXLD1366Q
AUTOMOTIVE COMPLIANT HIGH ACCURACY 1A, 60V LED DRIVER
Description
The ZXLD1366Q 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 1A.
The ZXLD1366Q uses a high-side output current sensing circuit
which uses an external resistor to set the nominal average output
current. The 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 resolution can be achieved by
applying a PWM signal to the ‘ADJ’ pin.
Soft-start can be forced using an external capacitor from the ADJ
pin to ground. Applying a voltage of 0.2V or lower to the ADJ pin
turns the output off and switches the device into a low current
standby state.
The ZXLD1366Q is qualified to AEC-Q100 Grade 1 and is
Automotive Compliant supporting PPAPs.
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
UV--DDFFNN33003300--66
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 or
PWM
PWM Resolution up to 1000:1
High Efficiency (up to 97%)
Switching Frequencies up to 1MHz
Wide Input Voltage Range: 6V to 60V
Inherent Open-Circuit LED Protection
Available in Thermally Enhanced Green Molding Packages
- V-DFN3030-6 JA = +44°C/W
- TSOT25 JA = +82°C/W
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q100 Standards for High Reliability
PPAP Capable (Note 4)
Typical Application Circuit
Applications
Automotive Lighting:
- Internal Door Lights
- Rear Fog Lamps
- Position Lights
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. Refer to http://www.diodes.com/quality/product_compliance_definitions/.
ZXLD1366Q
Document number: DS37078 Rev. 1 - 2
1 of 29
www.diodes.com
December 2015
© Diodes Incorporated
1 page  
ZXLD1366Q
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 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 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
ZXLD1366Q
Document number: DS37078 Rev. 1 - 2
5 of 29
www.diodes.com
December 2015
© Diodes Incorporated
5 Page 
Typical Operating Conditions (cont.)
1.100
1.080
1.060
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
15 LEDs
1.040
1.020
1.000
0.980
0
10
10
8
6
4
2
0
-2
-4
-6
-8
-10
0
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
15 LEDs
10
20 30 40
SUPPLY VOLTAGE (V)
Output Current, L = 150µH
20 30 40
SUPPLY VOLTAGE (V)
Output Current Deviation, L = 150µH
50
50
ZXLD1366Q
60
60
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
15 LEDs
0 10 20 30 40 50 60
SUPPLY VOLTAGE (V)
Efficiency, L = 150µH
ZXLD1366Q
Document number: DS37078 Rev. 1 - 2
11 of 29
www.diodes.com
December 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ZXLD1366Q.PDF ] | |
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