Microchip HV852 Handleiding
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1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
HV852
Features
No external components required when using an
external EL clock frequency
EL frequency can be set by an external resistor
Low Noise
DC to AC converter
Drives up to 5.3nF (approx. 1.5in2 lamp) load
Output voltage regulation
Enable function
EL Lamp dimming
Applications
Cellular phone keypad
Watches
Small handheld wireless devices
MP3 Players
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General Description
The Supertex HV852 is a high voltage, low noise, inductorless
EL (electroluminescent) lamp driver. It is designed to drive EL
lamps of up to 1.5in2, with capacitive values up to 5.3nF over
an input voltage range of 2.4 to 5.0V. The HV852 converts a
low voltage DC input to a high voltage AC output across an
EL lamp. It uses a charge pump scheme to boost the input
voltage eliminating the need for an external inductor, diode,
and high voltage capacitor commonly found in conventional
topologies.
The charge pump circuit discharges its energy into an EL lamp
through a high voltage H-bridge. Once the voltage reaches
its regulated limit, it is turned off to conserve power. The EL
lamp is then discharged to ground and the H-bridge changes
state to allow the charge pump to charge the EL lamp in the
opposite direction.
Typical Application Circuit
High Voltage,
Low Noise,
Inductorless EL Lamp Driver
EL Lamp frequency set by REL
+
-
EL LAMP
VDD CDD
REL
VDD = ON
GND = OFF
HV852MG
GND
VA
VB
EN
REL
VDD
CLKENCLKIN
Probleemoplossing Microchip HV852
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Specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | HV852 |