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PDF HV860 Data sheet ( Hoja de datos )
| Número de pieza | HV860 | |
| Descripción | Dimmable EL Lamp Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV860 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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HV860
Low Noise, Dimmable
EL Lamp Driver
Features
► Adjustable output regulation for dimming
► 220VPP output voltage for higher brightness
► Single cell lithium ion compatible
► 150nA shutdown current
► Separately adjustable lamp and converter frequencies
► 3x3mm 12-Lead QFN package
► Split supply capability
Applications
► Mobile cellular phone keypads
► PDAs
► Handheld wireless communication products
► Global Positioning Systems (GPS)
General Description
The Supertex HV860 is a high voltage driver designed for
driving Electroluminescent, (EL), lamps of up to 5 square
inches. The input supply voltage range is from 2.5 to 4.5V.
The device uses a single inductor and a minimum number of
passive components. Using the internal reference voltage,
the regulated output voltage is at a nominal voltage of 110V.
The EL lamp will therefore see ±110V. An enable pin, (EN),
is available to turn the device on and off via a logic signal.
The HV860 has two internal oscillators, a switching
MOSFET, and a high voltage EL lamp driver H-bridge. The
frequency for the switching MOSFET is set by an external
resistor connected between the RSW-Osc pin and the
supply pin VDD. The EL lamp driver frequency is set by
an external resistor connected between REL-Osc pin and
VDD pin. An external inductor is connected between the LX
and VDD pins or VIN for split supply applications. A 3.0nF
capacitor is connected between CS and ground. The EL
lamp is connected between VA and VB.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at CS. The voltage at CS will
start to increase. Once the voltage at CS reaches a nominal
value of 110V, the switching MOSFET is turned OFF to
conserve power. The outputs VA and VB are configured as
an H bridge and are switching in opposite states to achieve
±110V across the EL lamp.
EL lamp dimming can be accomplished by changing the
input voltage to the VREG pin. The VREG pin allows an
external voltage source to control the VCS amplitude. The
VCS voltage is approximately 87 times the voltage seen on
VREG.
Typical Application Circuit
VIN
CIN
RREG
LX
D
VDD
CDD
1.5V = On
0V = Off
RSW
REL
2 35
VREG VREF LX
10 VDD
CS 7
12 RSW-Osc
1 REL-Osc
VA 9
11 EN
GND
VB 8
4 HV860
CS
EL
Lamp
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
1 page  
HV860
Split Supply Configuration
The HV860 can also be used for handheld devices operating
from a battery where a regulated voltage is available. This
is shown in Figure 2. The regulated voltage can be used to
run the internal logic of the HV860. The amount of current
necessary to run the internal logic is 250µA max. Therefore,
the regulated voltage could easily provide the current without
being loaded down.
Enable/Disable Configuration
The HV860 can be easily enabled and disabled via a logic
control signal on the EN pin as shown in Figure 2. The
control signal can be from a microprocessor. When the
microprocessor signal is high the device is enabled, and
when the signal is low, it is disabled.
Figure 2: Split Supply and Enable/Disable Configuration
+
- VIN
Regulated Voltage = VDD
CDD
On = 1.5V
Off = 0V
CIN
RREG
LX
D
RSW
REL
2 35
10
VREG
VDD
VREF
LX
CS
7
12 RSW-Osc
1 REL-Osc
11 EN
GND
9
VA
VB 8
4 HV860
CS
EL
Lamp
Audible Noise Reduction
The EL lamp, when lit, emits an audible noise. This is due
to EL lamp construction. The audible noise generated by the
EL lamp can be a major problem for applications where the
EL lamp is held close to the ear, such as cellular phones.
The HV860 employs a proprietary circuit to help minimize
the EL lamp’s audible noise by using a single resistor, RREG,
as shown in Figure 3.
Figure 3: Typical Application Circuit for Audible Noise Reduction
VIN
VDD
CDD
1.5V = On
0V = Off
CIN RREG LX
D
2 35
10
VREG
VDD
VREF
RSW 12 RSW-Osc
1 REL-Osc
REL 11 EN
GND
LX
CS
VA
VB
7
9
8
4 HV860
CS
EL
Lamp
How to Minimize EL Lamp Audible Noise
The audible noise from the EL lamp can be minimized with to ground. EL lamp noise can be minimized without much
the proper selection of RREG. RREG is connected between the loss in brightness by setting the RC time constant to be
VREF and VREG pins. VREG has an internal 60pF capacitor approximately 1/12 of the EL frequency’s period.
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HV860.PDF ] | |
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