ZXLD1374 PDF даташит
Спецификация ZXLD1374 изготовлена «Diodes» и имеет функцию, называемую «60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER». |
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Детали детали
Номер произв | ZXLD1374 |
Описание | 60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER |
Производители | Diodes |
логотип |
30 Pages
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A Product Line of
Diodes Incorporated
ZXLD1374
60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
LED DRIVER CONVERTER WITH AEC-Q100
Description
The ZXLD1374 is a 60V LED driver with integrated 1.5A low side
switch to drive high current LEDs. It is a multi-topology converter
enabling it to operate in Buck, Boost and Buck-boost configurations;
efficiently controlling the current of up to 16-series connected LEDs.
The ZXLD1374 is a modified hysteretic converter using a patent
pending control scheme providing high output current accuracy in all
three topologies. High accuracy dimming is achieved through
DC control and high frequency PWM control.
The ZXLD1374 uses two pins for fault diagnosis. A flag output
highlights a fault, while the multi-level status pin gives further
information on the exact fault.
The ZXLD1374 has been qualified to AEC-Q100 Grade 1 enabling
operation in ambient temperatures from -40 to +125°C.
Pin Assignments
ADJ 1
REF 2
TADJ 3
SHP 4
STATUS 5
SGND 6
PGND 7
PGND 8
N/C 9
N/C 10
Thermal
Pad
20 GI
19 PWM
18 FLAG
17 ISM
16 VIN
15 VAUX
14 LX
13 LX
12 N/C
11 N/C
Features
• 0.5% Typical Output Current Accuracy
• 6.3 to 60V Operating Voltage Range
• 1.5A Integrated Low Side Switch
• LED Driver Supports Buck, Boost and Buck-Boost Topologies
• Wide Dynamic Range Dimming
• 20:1 DC Dimming
• 1000:1 Dimming Range at 500Hz
• Up to 1MHz Switching
• High Temperature Control of LED Current Using TADJ
• AEC-Q100 Grade 1
• TSSOP-20EP: Available in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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 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 Applications Circuit
VIN
C1
RGI2
R4
GND
RGI2 TH1
R1
PWVMAUX VIN ISM
GI LX
ADJ ZXLD1374 LX
REF FLAG
TADJ
STATUS
SHP NC SGND PGND
C2
100pF
L1
SD1
PSD3200
COUT
ZXLD1374
Document number: DS35032 Rev. 3 - 2
1 of 39
www.diodes.com
September 2012
© Diodes Incorporated
No Preview Available ! |
A Product Line of
Diodes Incorporated
ZXLD1374
Pin Descriptions
Pin
Name
Pin
Type
(Note 4)
Function
Adjust Input (for DC Output Current Control).
ADJ 1
Connect to REF to set 100% output current.
I Drive with dc voltage (125mV<VADJ< 2.5V) to adjust output current from 10% to 200% of set value. The
ADJ pin has an internal clamp that limits the internal node to less than 3V. This prevents the LED and power
switch from delivering too much current should ADJ get overdriven.
REF
2
O Internal 1.25V reference voltage output
Temperature Adjust (Input for LED Thermal Current Control).
TADJ
3
I Connect thermistor/resistor network to this pin to reduce output current above a preset temperature threshold.
Connect to REF to disable thermal compensation function (See section on thermal control).
SHP
4
I/O
Shaping capacitor for feedback control loop.
Connect 100pF ±20% capacitor from this pin to ground to provide loop compensation
Operation Status Output (analog output).
STATUS
5
Pin is at 4.5V (nominal) during normal operation.
O Pin switches to a lower voltage to indicate specific operation warnings or fault conditions (See section on
STATUS output).
Status pin voltage is low during shutdown mode.
SGND
6
P
Signal Ground.
Connect to 0V and pins 7 and 8.
PGND
7, 8
P
Power Ground.
Connect to 0V and pin 6 to maximize copper area.
N/C 9, 10, 11, 12
—
Not Connected Internally.
To maximize PCB copper for thermal dissipation connect to pins 7 and 8.
LX 13, 14
O Low-Side Power-Switch Output
Auxiliary Positive Supply to Internal Switch Gate Driver.
VAUX
15
Connect to VIN, or auxiliary supply from 6V to 15V supply to reduce internal power dissipation (Refer to
P
application section for more details).
At VIN >24V; to reduce power dissipation, VAUX can be connected to a 12V to 15V auxiliary power supply
(see Applications section).
Decouple to ground with capacitor close to device (refer to Applications section).
VIN 16
P
Input Supply to Device (6.3V to 60V).
Decouple to ground with capacitor close to device (refer to Applications section).
Current Monitor Input.
ISM 17
I Connect current sense resistor between this pin and VIN.
The nominal voltage, VSENSE, across the resistor is 218mV fixed in Buck mode and initially 225mV in Boost
and Buck-Boost modes, varying with duty cycle.
Flag Open Drain Output.
FLAG
18
O Pin is high impedance during normal operation.
Pin switches low to indicate a fault, or warning condition.
Digital PWM Output Current Control.
PWM
19
Pin driven either by open Drain or push-pull 3.3V or 5V logic levels.
I Drive with frequency higher than 100Hz to gate output ‘on’ and ‘off’ during dimming control.
The device enters standby mode when PWM pin is driven with logic low level for more than 15ms nominal
(Refer to application section for more details).
GI 20
Gain Setting Input.
Used to set the LED current in Boost and Buck-Boost modes.
I
In Buck mode operation the GI pin must be connected to ADJ.
For Boost and Buck-boost modes, connect to resistive divider from ADJ to SGND. This defines the ratio of
switch current to LED current (see application section). The GI pin has an internal clamp that limits the
internal node to less than 3V. This provides some failsafe should the GI pin get overdriven.
EP PAD
P
Exposed Pad.
Connect to 0V plane for electrical and thermal management.
Note:
4. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin.
ZXLD1374
Document number: DS35032 Rev. 3 - 2
2 of 39
www.diodes.com
September 2012
© Diodes Incorporated
No Preview Available ! |
Functional Block Diagram
A Product Line of
Diodes Incorporated
ZXLD1374
ZXLD1374
Document number: DS35032 Rev. 3 - 2
3 of 39
www.diodes.com
September 2012
© Diodes Incorporated
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