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See Technical Specifications

HV857MG-G

Low Noise, High Voltage EL Lamp Driver IC.

Manufacturer:

Microchip Technology, Inc
Mfr.Part #:

HV857MG-G
Datasheet:

HV857MG-G Datasheet (PDF)
Type:

EL Lamp Driver
Frequency:

1kHz
Voltage - Supply:

1.8V ~ 5V
Current - Supply:

20 mA
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HV857MG-G General Description

The HV857 is a high voltage driver designed for driving Electroluminescent (EL) lamps of up to 5 square inches. The input supply voltage range is from 1.8 to 5.0V. 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 ±95V. The chip can be enabled/disabled by connecting the resistor on RSW-Osc to VDD/GND. The HV857 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 the supply pin VDD. The EL lamp driver frequency is set by an external resistor connected between RELOsc pin and VDD pin. An external inductor is connected between the LX and VDD pins or VIN for split supply applications. A 0.003- 0.1μF 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 95V, 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 ±95V across the EL lamp.

Key Features

Patented audible noise reduction
Patented lamp aging compensation
190 VPP output voltage for higher brightness
Patented output timing for high efficiency
Single cell lithium ion compatible
150nA shutdown current
Wide input voltage range 1.8 to 5.0V
Separately adjustable lamp and converter frequencies
Output voltage regulation
Split supply capability

Microchip Technology, Inc Original Stock

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Lighting, Ballast Controllers	Series	-
Type	EL Lamp Driver	Frequency	1kHz
Voltage - Supply	1.8V ~ 5V	Current - Supply	20 mA
Current - Output Source/Sink	-	Dimming	No
Operating Temperature	-40°C ~ 85°C	Mounting Type	Surface Mount
Base Product Number	HV857