Microchip HV859 Bruksanvisning
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2023 Microchip Technology Inc. and its subsidiariesDS20005711A-page 1
HV859
Features
•Patented Audible Noise Reduction
•Patented Lamp Aging Compensation
•210 VPP Output Voltage for Higher Brightness
•Patented Output Timing for High Efficiency
•Single-cell Lithium Ion Compatible
•150 nA Shutdown Current
•Wide Input Voltage range of 1.8V to 5V
•Separately Adjustable Lamp and Converter
Frequencies
•Output Voltage Regulation
•Split Supply Capability
Applications
•LCD Backlighting
•Mobile Cellular Phone Keypads
• PDAs
•Handheld Wireless Communication Products
•Global Positioning Systems (GPS)
General Description
The HV859 is a high-voltage driver designed for driving
Electroluminescent (EL) lamps of up to 5 in
2. The input
supply voltage range is from 1.8V to 5V. The device
uses a single inductor and a minimum number of
passive components. The nominal regulated output
voltage that is applied to the EL lamp is ±105V. The
chip can be enabled/disabled by connecting the
resistor on RSW-Osc to VDD/Ground.
The HV859 has two internal oscillators, a switching
MOSFET and a high-voltage EL lamp driver. The
frequency for the switching MOSFET is set by an
external resistor connected between the RSW-Osc pin
and VDD pin. The EL lamp driver frequency is set by an
external resistor connected between RSW-Osc pin and
the VDD pin. An external inductor is connected
between the LX and VIN for split supply applications. A
capacitor with a value between 0.003 µF to 0.1 µF,
200V rated, is connected between C
Sand ground. The
EL lamp is connected between VA and VB.
The switching MOSFET charges the external inductor
and discharges it into the capacitor at C
S
. Then, the
voltage at CSwill start to increase. Once the voltage at
CSreaches a nominal value of 105V, 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 ±105V across
the EL lamp.
Package Types
Pads of the 8-lead DFN are at the bottom of the package. See Table 2-1 for pin
information.
8-lead MSOP 8-lead WDFN
1
2
3
4
8
7
6
5
VA
VB
CS
LX
VDD
RSW-Osc
REL-Osc
GND
VDD
RSW-Osc
REL-Osc
GND
1
2
3
4
8
7
6
5
VA
VB
CS
LX
High-Voltage EL Lamp Driver for Low-Noise Applications
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV859 |
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