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HV857L

Low Noise, High Voltage EL Lamp Driver IC

Status: In Production

Features:

  • Audible noise reduction
  • 190 VPP 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
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The HV857L is a low noise, high voltage driver designed for driving Electroluminescent (EL) lamps of up to five 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 0.003-0.1μF 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 configured as an H bridge, and are switching in opposite states to achieve ±95V across the EL lamp.

Additional Features
    • Audible noise reduction
    • 190 VPP 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
Parametrics
Name
Value
Type
Single Lamp Driver
Input Voltage Low (V)
1.8
Input Voltage High (V)
5
Nominal Output Voltage (V)
±95
Max Switch Resistance(Ω)
6.0
Output Regulation
Yes
Max Lamp Size per Device (in2)
5.0
Package
DFN-8, MSOP-8
Product Type
Single Lamp Drivers
Frequency (EL, Typical)
175Hz - 235Hz
Θja (C/W)
37, 171
VOUT
190

Documents

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Data Sheets

User Guides

06/24/2015
400KB

Development Environment

  • Demo & Evaluation Boards
Demo & Evaluation Boards
HV857LDB1 Demo Board
HV857LDB1 Demo Board ( HV857LDB1 )

The HV857LDB1 demoboard contains all necessary circuitry to demonstrate the features of the HV857L EL lamp driver.

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
HV857LMG-G
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
HV857LK7-G
0.020780
0.118788
8
WDFN
3x3x0.8mm
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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