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PDF HV853 Data sheet ( Hoja de datos )
| Número de pieza | HV853 | |
| Descripción | Inductorless EL Lamp Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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HV853
High Voltage, Low Noise,
Inductorless EL Lamp Driver
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
► Available in 8-Lead DFN and MSOP packages
Applications
► Cellular phone keypad
► Watches
► Small handheld wireless devices
► MP3 Players
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 REL or by applying an external clock where the clock
frequency is divided by 128 to set the EL lamp frequency.
Typical Application Circuits
VDD = ON
GND = OFF
+
VDD
-
CDD
1
REL 2
3
4
VDD
REL
EN
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
HV853
VDD = ON
GND = OFF
EL
LAMP
+
VDD
-
CDD
VDD
GND
1
VDD
2
REL
3
EN
4
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
HV853
EL
LAMP
VDD
EL Lamp Frequency set by REL
EL Lamp Frequency set by External Clock
1 page  
HV853
Pin Description
Pin # Name Description
1 VDD Input supply voltage pin.
An external resistor to VDD will set the EL lamp frequency. The EL frequency is inversely proportional to
the REL resistor value. A 1.5MΩ resistor would provide a nominal lamp frequency of 294Hz
2 REL
fEL = (1.5MΩ)(294)
REL
When using an external clock to set the EL lamp frequency, the REL pin should be connected to
ground.
3
EN
Enable input pin. Logic high will turn the device on. An external R-C circuit can be added for a delayed
turn off.
Logic input pin. An external logic clock applied to this pin can be used to set the EL lamp frequency
4
CLKIN
(see Figure 3). The EL lamp frequency is the external clock frequency divided by 128. This is useful
for applications requiring the EL lamp to be synchronized to a system clock. Connect to ground when
not in use.
5
CLKEN
Logic input pin. Logic high will cause the EL lamp frequency to be set by the CLKIN input. Logic low will
cause the EL lamp frequency to be set by the external REL resistor.
6 GND IC ground pin.
7 VB EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
8 VA EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HV853.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HV850 | Inductorless EL Lamp Driver | Supertex |
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