HV853 Ver la hoja de datos (PDF) - Supertex Inc
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componentes Descripción
Fabricante
HV853 Datasheet PDF : 7 Pages
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HV853
EL Lamp Dimming Using PWM
EL lamp dimming can be achieved by applying a PWM signal to the ENABLE pin. This is done by pulse skipping the out-
put pulses. The PWM frequency should be kept below the EL frequency but above 50Hz to avoid flickering.
Figure 4: PWM Dimming Circuit
+
VDD
-
PWM VDD
Signal GND
1 VDD
CDD
R EL
2 REL
VA 8
VB 7
3 EN
GND 6
4 CLKIN CLKEN 5
HV853MG
EL Lamp
Pin Descriptions: 10-Lead DFN (K7) / 8-Lead MSOP (MG)
K7
MG
Pin #
Pin
Name
Description
1
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 fre-
quency of 280Hz
2
2
REL
fEL = (1.5MΩ)(280Hz) / (REL)
When using an external clock to set the EL lamp frequency, the REL pin should be con-
nected to ground.
3
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
4
4
CLKIN
frequency (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
-
NC No connect.
6
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.
7,8
6
GND IC ground pin.
9
7
VB EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
10
8
VA EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
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