HV852 データシートの表示（PDF） - Supertex Inc
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HV852 Datasheet PDF : 7 Pages
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HV852
Figure 3: Independent Programmable Output Frequency (fEL)
+
VDD
-
CDD
VDD
VA
EL
VDD = ON
REL
VB
Lamp
GND = OFF
EN
GND
VDD
CLKIN CLKEN
VDD
GND
fCLK
HV852MG
Note:
fEL = fCLK/128
EL Lamp frequency set by an external clock
EL Lamp Dimming Using PWM
EL lamp dimming can be achieved by applying a PWM signal to the ENABLE pin. EL Lamp brightness is proportional to
the PWM signal duty cycle. 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
+
VDD
-
PWM VDD
Signal GND
1 VDD
CDD
REL
2 REL
VA 8
VB 7
3 EN
GND 6
4 CLKIN CLKEN 5
EL Lamp
Pin Description
Name
8-Lead 10-Lead
MSOP DFN
VDD
1
1, 5
HV852MG
Description
Input supply voltage pin.
REL
2
EN
3
CLKIN
4
CLKEN
5
GND
6
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 250Hz.
2
fEL =
(1.5MΩ) (250Hz)
REL
When using an external clock to set the EL lamp frequency, the REL pin should be
connected to ground.
3
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
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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.
6
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 IC ground pin.
VB
7
9
EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
VA
8
10
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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