Microchip HV857DB1 Manual


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Side 1/2
Supertex inc.
Supertex inc.
www.supertex.com
HV857DB1
Doc.# DSDB-HV857DB1
A032813
General Description
The Supertex HV857DB1 demoboard contains all necessary
circuitry to demonstrate the features of the HV857 EL lamp
driver.
Simply connect it to a power supply and a lamp. For
additional assistance in designing EL driver circuits, please
refer to application notes AN-H33 (effect of external
components on performance of Supertex EL drivers)
and AN-H43 (EL lamp driver circuits to reduce audible
noise).
Board Layout and Connection Diagram
Low Noise, High Voltage
EL Lamp Driver IC Demoboard
Parameter Value
Input voltage: 1.8 to 5.0V
Typical supply current: 26mA
Lamp size: 2.6in2
Lamp frequency: 206Hz
Converter frequency: 80kHz
Connections:
EN - Enable Input
Enables/Disables the lamp driver. A logic high (connect
to VDD) enables the driver, and a logic low (connect to
GND) disables the driver. This input can be connected to
a mechanical switch or to a logic circuit output that has a
source impedance of less than 20kΩ.
VDD - IC Supply
Supplies the HV857 EL driver IC. The supplied circuit is
optimized for 3.0V operation. The operating range can be
from 1.8 to 5.0V. Connect to positive terminal of a power
supply.
VIN - Inductor Supply
Supplies the high voltage power converter. Connect to
positive terminal of a power supply.
GND - Circuit Ground
Connect to VDD and VIN negative terminals. Supply bypass
capacitor for both VDD and VIN are provided on the demo
board. External supply bypass capacitors are not required.
VA and VB - Lamp Connections
Connect to an EL lamp. Polarity is irrelevant.
Note:
Make sure all the above connections are made before powering up the supply voltages.
Actual Dimensions: 12mm x 12mm
HV857
HV857
CDD
RSW
LX
VA
VDD VB
GND
VIN
EN
CS
D
CIN
REL
Specications


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV857DB1

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