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ZXLD1350 Datasheet

30V 350mA LED DRIVER

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A Product Line of
Diodes Incorporated
ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
Description
The ZXLD1350 is a hysteretic mode inductive step-down
converter with integrated switch and high side current sense.
It operates from an input supply from 7V to 30V driving single
or multiple series connected LEDs efficiently external
adjustable output current up to 350mA.
The ZXLD1350 has been qualified to AECQ100 grade 2
allowing it to operate at ambient temperatures from -40 to
105°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 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.
Pin Assignments
LX
GND
ADJ
TSOT23-5
Top View
VIN
ISENSE
Features
Typical Application Circuit
Simple low parts count
Internal 30V NDMOS switch
Internal PWM filter
High efficiency (up to 95% (Note 1)
Wide input voltage range: 7V to 30V
40V transient capability
Up to 1MHz switching frequency
Typical 4% output current accuracy
Qualified to AEC-Q100 Grade 2
Available in “Green” Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 2)
VIN
7~30V
C1
1µF
GND
RS
0.33Ω
L1
47µH
VIN SET
ADJ ZXLD1350
GND
LX
Notes: 1. Using standard external components as specified under electrical characteristics. Efficiency is dependent upon the number of LEDs driven and on
external component types and values.
2. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at:
http://www.diodes.com/products/lead_free.html
ZXLD1350
Document number: DS33468 Rev. 8 - 2
1 of 22
www.diodes.com
March 2011
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

ZXLD1350 Datasheet

30V 350mA LED DRIVER

No Preview Available !

Block Diagram
VIN
A Product Line of
Diodes Incorporated
ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
RS
D1
C1
ADJ
VIN
Voltage
regulator
5V
Shutdown
circuit
200k 4KHz
VIN
R1
Current sense circuit
ISENSE
-
+
Comparator
-
+
R2
Vref 1.25V
R3
GND
Figure 1. Block diagram – Pin Connection
L1
LX
MN
Pin Description
Name
LX
GND
ADJ
ISENSE
VIN
Pin No.
1
2
3
4
5
Description
Drain of NDMOS switch
Ground (0V)
Multi-function On/Off and brightness control pin:
• Leave floating for normal operation.(VADJ= VREF =1.25V giving nominal average output current
IOUTnom=0.1/RS)
• Drive to voltage below 0.2V to turn off output current
• Drive with DC voltage (0.3V<VADJ<2.5V) to adjust output current from 25% to 200%(†) of IOUTnom
• Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.
Adjustment range 25% to 100% of IOUTnom for f>10kHz and 1% to 100% of IOUTnom for f<500Hz
• Connect a capacitor from this pin to ground to increase soft-start time. (Default soft-start time=0.5ms.
Additional soft-start time is approx.0.5ms/nF)
Connect resistor RS from this to VIN to define nominal average output current IOUTnom=0.1/RS
(Note: RSMIN=0.27V with ADJ pin open circuit)
Input voltage (7V to 30V). Decouple to ground with 1µF of higher X7R ceramic capacitor close to
device
ZXLD1350
Document number: DS33468 Rev. 8 - 2
2 of 22
www.diodes.com
March 2011
© Diodes Incorporated


Part Number ZXLD1350
Description 30V 350mA LED DRIVER
Maker Diodes
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ZXLD1350 Datasheet PDF






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