HV850(2011) データシートの表示（PDF） - Supertex Inc
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HV850 Datasheet PDF : 8 Pages
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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
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