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HV857K7-G, HV857L, HV857LK7-G

Table of contents:
Info of HV857K7-G
Info of HV857L
Info of HV857LK7-G

HV857K7-G, HV857L, HV857LK7-G Selling Leads, Datasheet

MFG:Supertex Package Cooled:DFN-8 D/C:0551+

HV857K7-G, HV857L, HV857LK7-G Datasheet download

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Part Number: HV857K7-G

MFG: Supertex

Package Cooled: DFN-8

D/C: 0551+

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HV857L General Description

The Supertex HV857L is a low noise, high voltage driver designed for driving Electroluminescent (EL) lamps of up to fi ve square inches. It is the low noise version of the EL lamp driver HV857. The input supply voltage range is from 1.8V 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/ground.

The HV857L 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 the REL-Osc and VDD pins. An external inductor is connected between the LX and VDD pins, or VIN for split supply applications. A 0.003-0.1F capacitor is connected between CS and ground. The EL lamp is connected between the VA and VB pins.

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 confi gured as an H bridge, and are switching in opposite states to achieve ±95V across the EL lamp.

HV857L Maximum Ratings

Supply Voltage, VDD                  -0.5V to 6.5V
Operating Temperature      -40°C to +85°C
Storage Temperature       -65°C to +150°C
DFN-8 Power Dissipation                       1.6W
MSOP-8 Power Dissipation                 300mW
Output voltage, VCS               -0.5 to +120V

HV857L Features

·Audible noise reduction
·190 V_PP output voltage for higher brightness
·Single cell lithium ion compatible
·150nA shutdown current
·Wide input voltage range 1.8V to 5.0V
·Separately adjustable lamp and converter frequencies
·Output voltage regulation
·Split supply capability
·Available in DFN-8 and MSOP-8 packages

HV857L Typical Application

·Mobile cellular phones
·Keypad backlighting
·LCD backlighting
·PDAs
·Handheld wireless communication products
·Global Positioning Systems (GPS)

HV857L Connection Diagram

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