DRIVER CONTROLLER. ZXLD1371 Datasheet

ZXLD1371 CONTROLLER. Datasheet pdf. Equivalent

Part ZXLD1371
Description 60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
Feature A Product Line of Diodes Incorporated ZXLD1371 60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER-CO.
Manufacture Diodes
Datasheet
Download ZXLD1371 Datasheet



ZXLD1371
A Product Line of
Diodes Incorporated
ZXLD1371
60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER-CONTROLLER
Description
Pin Assignments
The ZXLD1371 is an LED driver controller IC for driving
external MOSFETs to drive high current LEDs. It is a multi-
topology controller enabling it to efficiently control the current
through series connected LEDs. The multi-topology enables it
to operate in buck, boost and buck-boost configurations.
The 60V capability coupled with its multi-topology capability
enables it to be used in a wide range of applications and drive
in excess of 15 LEDs in series.
The ZXLD1371 is a modified hysteretic controller using a
patent pending control scheme providing high output current
accuracy in all three modes of operation. High accuracy
dimming is achieved through DC control and high frequency
PWM control.
The ZXLD1371 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.
ADJ
REF
TADJ
SHP
STATUS
SGND
PGND
N/C
1
2
3
4
5
6
7
8
TSSOP-16EP
Features
0.5% typical output current accuracy
5 to 60V operating voltage range
LED driver supports Buck, Boost and Buck-boost
configurations
Wide dynamic range dimming
o 10:1 DC dimming
o 1000:1 dimming range at 500Hz
Up to 1MHz switching
High temperature control of LED current using TADJ
Available in Automotive Grade with AEC-Q100 and
TS16949 certification
Available in “Green” Molding Compound (No Br, Sb) with
lead Free Finish/ RoHS Compliant (Note 1)
Note 1: EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2). All applicable
RoHS exemptions applied.
16 GI
15 PWM
14 FLAG
13 ISM
12 VIN
11 VAUX
10 GATE
9 N/C
Typical Application Circuit
VIN 8V to 22V
C1
10µF
RGI2
75k
R4
1.8k
RGI1 TH1
24k 10k
ILED = 1A
R1
0R05
VAUX VIN
PWM
ISM
L1
33µH
D1
PDS3100
GI
ADJ ZXLD1371 GATE
REF FLAG
TADJ
STATUS
SHP NC SGND PGND
Q1
DMN6068LK3
1 to 6
LEDs
COUT
10µF
C2
330pF
Thermally connected
Buck-Boost Diagram Utilizing Thermistor and TADJ
ILED
100%
Rth REF
TH1 TADJ
10%
70°C 85°C
TLED
Thermal network response in Buck configuration with:
Rth = 1.8kΩ and TH1 = 10kΩ (beta = 3900)
Curve Showing LED Current vs. TLED
ZXLD1371
Document number: DS35436 Rev. 1 - 2
1 of 42
www.diodes.com
February 2012
© Diodes Incorporated



ZXLD1371
Pin Descriptions
A Product Line of
Diodes Incorporated
ZXLD1371
Pin
Name
Pin
ADJ 1
REF
2
TADJ
3
SHP
4
STATUS 5
SGND
PGND
N/C
N/C
GATE
6
7
8
9
10
VAUX
11
VIN 12
Type
(Note 2)
I
O
I
I/O
O
P
P
-
O
P
P
Description
Adjust input (for dc output current control)
Connect to REF to set 100% output current.
Drive with dc voltage (125mV<VADJ< 1.25V) to adjust output current from 10% to 100%
of set value. The ADJ pin has an internal clamp that limits the internal node to less than
3V. This provides some failsafe should they get overdriven
Internal 1.25V reference voltage output
Temperature Adjust input for LED thermal current control
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.)
Shaping capacitor for feedback control loop
Connect 330pF ±20% capacitor from this pin to ground to provide loop compensation
Operation status output (analog output)
Pin is at 4.5V (nominal) during normal operation.
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
Signal ground (Connect to 0V)
Power ground - Connect to 0V and pin 8 to maximize copper area
Not Connected internally – recommend connection to pin 7, (PGND), to maximize PCB
copper for thermal dissipation
Not Connected internally – recommend connection pin 10 (GATE) to permit wide copper
trace to gate of MOSFET
Gate drive output to external NMOS transistor – connect to pin 9
Auxiliary positive supply to internal switch gate driver
At VIN < 8V; a bootstrap circuit is recommended to ensure adequate gate drive voltage
(see Applications section)
At VIN > 8V; connect to VIN
At VIN >24V; to reduce power dissipation, VAUX can be connected to an 8V to 15V
auxiliary power supply (see Applications section). Decouple to ground with capacitor
close to device (see Applications section)
Input supply to device 5V to 60V
Decouple to ground with capacitor close to device (refer to Applications section)
ISM 13
FLAG
14
PWM
15
GI 16
EP PAD
Current monitor input. Connect current sense resistor between this pin and VIN
I 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
O Pin is high impedance during normal operation
Pin switches low to indicate a fault, or warning condition
Digital PWM output current control
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)
Gain setting input
Used to set the device in Buck mode or Boost, Buck-boost modes and to control the
sense voltage in Boost and Buck-boost modes
I
Connect to ADJ pin for Buck mode operation
For Boost and Buck-boost modes, connect to resistive divider from ADJ to SGND. The
GI divider is required to compensate for duty cycle gating in the internal feedback loop
(see Application section). The GI pin has an internal clamp that limits the internal node to
less than 3V. This provides some failsafe should it become overdriven.
P Exposed paddle. Connect to 0V plane for electrical and thermal management
Notes: 2. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin.
ZXLD1371
Document number: DS35436 Rev. 1 - 2
2 of 42
www.diodes.com
February 2012
© Diodes Incorporated





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