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LDS8720 Datasheet(PDF) 5 Page - IXYS Corporation

Part No. LDS8720
Description  184 WLED Matrix Driver with Boost Converter
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8720 Datasheet(HTML) 5 Page - IXYS Corporation

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LDS8720
© 2011 IXYS Corp.
5
Doc. No. 8720DS, Rev. N1.1
Characteristics subject to change without notice
PIN DESCRIPTION
Pin #
Name
Function
1
VIN
Input Voltage, connect to battery or power supply
2
GND
Analog Ground
3
PGND
Power Ground
4
SW
Switch input; Connect inductor terminal to this pin
5
VOUT
Output voltage; Connect the LED string anode
terminal to this pin.
6
HVB
High Voltage Bypass; Connect a 470 pF capacitor
between this point and VOUT
7
LEDS
Current Sense input. Connect LED string cathode
terminal to this pin
8
EN/PWM Device Enable (active high) and Dimming Control
PAD
PAD
Connect to GND on the PCB
Top view: TDFN 8-lead 2 X 3 mm
PIN FUNCTION
VIN is the supply pin for the driver. A small 1 μF
ceramic bypass capacitor is required between the VIN
pin and ground near the device. The operating input
voltage range is from 2.7 V to 5.5 V. If the input
supply
voltage
falls
below
the
under-voltage
threshold, switch is disabled, and the device enters
shutdown mode.
HVB is the internal high voltage reference point.
Connect a 4700 pF capacitor between this point and
VOUT.
EN/PWM is the enable and PWM control logic input.
Guaranteed levels of logic high and logic low are set
at 1.4 V and 0.4 V respectively. When EN/PWM is
initially taken high, the device becomes enabled and
LED current sets to maximum programmed value..
To place the device into shutdown
mode, the
EN/PWM pin must be held low for more than 10 ms.
VOUT is the driver output. Connect it to the LED
anode. A ceramic bypass capacitor of 1 µF requires
between the VOUT pin and ground near the device.
GND is the ground reference for the analog circuits.
The pin must be connected to the ground plane on
the PCB. Avoid high currents flowing trough traces
connecting this pin with EN/PWM signal source.
PGND is the current return for high current circuits.
The pin must be connected to the ground plane on
the PCB. Connect GND and PGND as close to the
driver as possible.
LEDS is the Current Sense pin that provides internal
regulated current sink for LED string. Connect LED
string cathode to this pin. This pin enter high-
impedance zero current state whenever the device is
in shutdown mode.
PAD is the exposed pad underneath the package.
For best thermal performance, the pad should be
soldered to the PCB and connected to the ground
plane


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