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PDF HV862 Data sheet ( Hoja de datos )
| Número de pieza | HV862 | |
| Descripción | Dual EL Lamp Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV862 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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HV862
Dimmable, Low Noise, Dual EL Lamp Driver
Features
► Adjustable output regulation for dimming
► Lamp fade-in/fade-out capability
► Low audible noise
► 180VPP output voltage for higher brightness
► 1.5V enable input logic high
► Single cell lithium ion compatible
► One miniature inductor to power both lamps
► Separately adjustable lamp and converter frequencies
► Split supply capability
► 16-Lead QFN package
Applications
► Dual display cellular phones
► Keypad and LCD backlighting
► PDAs
► Handheld wireless communication products
► Global Positioning Systems (GPS)
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 value of 90V.
The EL Lamps will therefore see ±90V. The two EL Lamps
can be turned ON and OFF using two CMOS logic inputs,
EN1 and EN2. The driver is disabled when both EN1 and
EN2 are at logic low.
The HV862 has two internal oscillators, a switching MOSFET,
and two high voltage EL Lamp driver H-bridges. Each driver
has its own half bridge common output, COM1 and COM2,
which significantly minimizes the DC offset seen by the EL
Lamp. 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 the REL-osc pin and the
VDD pin. An external inductor is connected between the LX
and V pins or V for split supply applications. Depending
DD IN
upon the EL Lamp sizes, a 1.0nF to 10.0nF capacitor is
connected between the CS and ground.
General Description
The Supertex HV862 is a low noise, dimmable, high
voltage, dual EL Lamp driver designed for driving two
electroluminescent (EL) Lamps with a combined area of 5.0
square inches. The input supply voltage range is from 2.5V
to 4.5V. Enable input logic high can go as low as 1.5V, which
allows logic interface operating from typical 1.8V supplies.
The device is designed to minimize audible noise emitted by
the EL Lamps.
As the switching MOSFET charges the external inductor
and discharges it into the capacitor at CS, the voltage at
C will start to increase. Once the voltage at C reaches a
SS
nominal value of 90V, the switching MOSFET is turned OFF
to conserve power.
EL Lamp dimming can be accomplished by applying a PWM
logic signal to the PWM pin. The EL Lamp brightness will be
proportional to the PWM duty cycle. The HV862 can also
slowly turn the EL Lamp ON/OFF giving a fade ON/OFF
appearance.
Typical Application Circuit
VIN = 3.2V to 4.2V
4.7µF
100µH Coilcraft
LPS4012
1N4148
3.3MΩ
VDD = 3.0V
0.1µF
Input Logic Control:
ON = 1.5V to VDD
OFF = 0V to 0.2V
15 14 7
8
VREG VOUT LX
3
2.0MΩ 1
VDD
REL-osc
2 RSW-osc
825kΩ
4
EN1
5 EN2
VREF PWM
16
2.2µF
13
CS
12
EL1
11
COM1
EL2 9
COM2 10
GND
6
HV862K7-G
3.3nF
100V NPO
EL1
EL2
1 page  
Figure 1: Block Diagram
VDD
LX
EN1
EN2
RSW-osc
VREG
VOUT
GND
REL-osc
EL1 Enable
EL2 Enable
PWM Switch
Oscillator
0 to 88%
C+-
60pF
VSENSE
1.26V
VREF
2 x EL Freq.
1 x EL Freq.
CS
VCS
Output
Drivers
VCS
VCS
EL1
COM1
EL2
COM2
PWM VREF
HV862
Figure 2: Test Circuit
IIN
VIN
VDD
IDD
0.1µF
Input Logic Control:
ON = 1.5V to VDD
OFF = 0V to 0.2V
4.7µF
100µH Coilcraft
LPS4012
3.3MΩ
1N4148
15 14 7
8
3
2.0MΩ 1
2
825kΩ
4
5
VREG VOUT LX
VDD
REL-osc
RSW-osc
EN1
EN2
VREF
PWM
CS
12
EL1
COM1 11
EL2 9
10
COM2
GND
16
2.2µF
13
6
HV862K7-G
3.3nF
100V NPO
620Ω
620Ω
12nF
12nF
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HV862.PDF ] | |
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