Microchip HV853 Bruksanvisning
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1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com●● ●
HV853
Features
No external components required when using an
external EL clock frequency
Audible noise reduction with improved EMI
EL frequency can be set by an external resistor
DC to AC converter
Drives up to 5.3nF (approx. 1.5in2 lamp) load
Output voltage regulation
Enable function
EL Lamp dimming
Available in 10-Lead DFN and 8-Lead MSOP
packages
Applications
Cellular phone keypad
Watches
Small handheld wireless devices
MP3 Players
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General Description
The Supertex HV853 is a high voltage, low noise EL
(electroluminescent) lamp driver. It is the low noise version of
the HV852 with improved EMI performance, operating over an
input voltage range of 3.2V to 5.0V. It is designed to drive EL
lamps of up to 1.5in2, with capacitive values up to 5.3nF. The
HV853 converts a low voltage DC input to a high voltage AC
output across an EL lamp. A nominal regulated output voltage
of ±80V is applied to the 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.
The EL lamp frequency can be set either by an external
resistor RELor by applying an external clock where the clock
frequency is divided by 128 to set the EL lamp frequency.
Typical Application Circuits
High Voltage, Low Noise,
Inductorless EL Lamp Driver
EL Lamp Frequency set by REL
+
-
VDD = ON
GND = OFF
VDD CDD
VDD
GND
EL
LAMP
VDD
+
-GND
CLKEN
VA
VB
CLKIN
EN
REL
VDD
GND
CLKEN
VA
VB
CLKIN
EN
REL
VDD EL
LAMP
VDD CDD
REL
VDD = ON
GND = OFF
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
HV853MG HV853MG
EL Lamp Frequency set by External Clock
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV853 |
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