Instrukcja obsługi Microchip HV859

Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip HV859 (20 stron) w kategorii Niesklasyfikowane. Ta instrukcja była pomocna dla 16 osób i została oceniona przez 9 użytkowników na średnio 4.6 gwiazdek

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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

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