|
|
PDF HV850 Data sheet ( Hoja de datos )
| Número de pieza | HV850 | |
| Descripción | Inductorless EL Lamp Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HV850 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
|
No Preview Available !
Supertex inc.
HV850
High Voltage, Low Noise,
Inductorless EL Lamp Driver
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 5.0nF load (approx. 1.5in2 lamp)
►► Output voltage regulation
►► Enable function
►► EL Lamp dimming
Applications
►► Cell phone keypads and displays
►► Transceivers
►► MP3 players
►► Watches
►► Pagers
►► Measuring instruments/gauges
General Description
The Supertex HV850 is a high voltage electroluminescent
(EL) Lamp Driver IC. It is designed to drive EL lamps of up to
1.5in2, with capacitive values up to 5.0nF. The HV850 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 external inductors, diodes,
and high voltage capacitors, components 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 (For VDD = 3.4V to 4.2V only)
VDD = ON
GND = OFF
+
VDD
-
CDD
VDD
GND
1 VDD
VA 8
HV850
2 REL
VB 7
3 EN
GND 6
4 CLKIN CLKEN 5
EL lamp frequency
set by an external clock
EL Lamp
VDD
+
VDD
CDD
-
VDD = ON
GND = OFF
1 VDD
VA 8
REL HV850
2 REL
VB 7
3 EN
GND 6
4 CLKIN CLKEN 5
EL Lamp
EL lamp frequency set by REL
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
1 page  
HV850
Figure 2: Push Button Turn on with Delay Turn off (For VDD = 3.4V to 4.2V only)
1 VDD
VA 8
+
VDD
-
Push
CDD
button
turn on
REL HV850
2 REL
VB 7
3 EN
GND 6
CR
4 CLKN CLKEN 5
EL
Lamp
RC time constant will set
Turn OFF Delay time
Figure 3: Independent Programmable Output Frequency (fEL) (For VDD = 3.4V to 4.2V only)
+
VDD
-
CDD
1 VDD
VA 8
HV850
2 REL
VB 7
EL
Lamp
VDD = ON
GND = OFF
VDD
GND
3 EN
GND 6
4 CLKIN CLKEN 5
EL Lamp Dimming Using PWM
EL lamp dimming can be achieved by applying a PWM signal to the ENABLE pin. The PWM signal duty cycle is proportional
to the lamp brightness. This is done by pulse skipping the output pulses. The PWM frequency should be kept below the EL
frequency but above 50Hz to avoid flickering.
Figure 4: PWM Dimming Circuit (For VDD = 3.4V to 4.2V only)
+
VDD
-
PWM VDD
Signal GND
1 VDD
VA 8
CDD
REL HV850
2 REL
VB 7
3 EN
GND 6
4 CLKIN CLKEN 5
EL Lamp
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HV850.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HV850 | Inductorless EL Lamp Driver | Supertex |
| HV852 | Inductorless EL Lamp Driver | Supertex |
| HV853 | Inductorless EL Lamp Driver | Supertex |
| HV857 | High Voltage EL Lamp Driver IC |  Supertex Inc |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |