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PDF ZXLD1356 Data sheet ( Hoja de datos )
| Número de pieza | ZXLD1356 | |
| Descripción | 60V 550mA LED DRIVER | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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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.
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%)
• Wide input voltage range: 6V to 60V
• Inherent open-circuit LED protection
• Available in thermally enhanced packages
o DFN3030-6
θJA 44° C/W
o TSOT23-5
θJA 82° C/W
• Available in Green molding (no Br, Sb) with lead free
finish/RoHS compliant
• Qualified to AEC-Q100 Grade 1
o TSOT23-5
ZXLD1356ET5TA
Applications
• Low voltage halogen replacement LEDs
• Automotive lighting
• Low voltage industrial lighting
• LED back-up lighting
• Illuminated signs
• Emergency lighting
• SELV lighting
• Refrigeration lights
A Product Line of
Diodes Incorporated
ZXLD1356
60V 550mA LED DRIVER with AEC-Q100
Pin Assignments
LX
GND
VIN
ADJ
TSOT23-5
Top View
(TOP VIEW)
ISENSE
LX 1
6 VIN
GND 2
5 GND
ADJ 3
4 ISENSE
DFN3030-6
Typical Application Circuit
D1
VIN (24V)
Rs
0.36V
C1 4.7µF
100nF
GND
VIN
ADJ
L1
I SENSE
ZXLD1356
GND
LX
ZXLD1356
Document number: DS33470 Rev. 3 - 2
1 of 29
www.diodes.com
December 2010
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
A Product Line of
Diodes Incorporated
Device Description
ZXLD1356
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 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%.
ZXLD1356
Document number: DS33470 Rev. 3 - 2
5 of 29
www.diodes.com
December 2010
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
Typical Operating Conditions (Cont.)
A Product Line of
Diodes Incorporated
ZXLD1356
ZXLD1356 Switching Frequency
L = 100µH
70 0
60 0
50 0
40 0
30 0
20 0
10 0
00
1 LED
10 0
90
80
70
60
50
40
30
20
10
0
0
1 LED
10
3 LEDs
20
5 LEDs
30
Supply Voltage (V)
7 LEDs 9 LEDs
40
11 LEDs
ZXLD1356 Duty Cycle
L = 100µH
50 60
13 LEDs 15 LEDs
10
3 LEDs
20
5 LEDs
30
Supply Voltage (V)
7 LEDs 9 LEDs
40
11 LEDs
50 60
13 LEDs 15 LEDs
ZXLD1356
Document number: DS33470 Rev. 3 - 2
11 of 29
www.diodes.com
December 2010
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ZXLD1356.PDF ] | |
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