Microchip HV861 Manual de Usario

Microchip No categorizado HV861

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 2023 Microchip Technology Inc. and its subsidiaries DS20005911A-page 1

HV861

Features

• Adjustable Output Regulation for Dimming

• Lamp Fade-in/Fade-out Capability

• Low Audible Noise

• 180 VPP Output Voltage for Higher Brightness

• 1.5V Enable Input Logic High

• Single-cell Lithium Ion-compatible

• One Miniature Inductor to Power both Lamps

• Separately Adjustable Lamp and Converter

Frequencies

• Split Supply Capability

Applications

• Dual Display Cellular Phones

• Keypad and LCD Backlighting

• Personal Digital Assistant (PDA)

• Handheld Wireless Communication Products

• Global Positioning Systems (GPS)

General Description

The HV861 is a low-noise dimmable high-voltage dual EL

lamp driver designed for driving two electroluminescent

(EL) lamps with a combined area of 5 in2. The input

supply voltage range is from 2.5V to 4.5V. Enable input

logic high can go as low as 1.5V, which allows logic

interface operating from typical 1.8V supplies. The

device is designed to minimize audible noise emitted by

the EL lamps.

The device uses a single inductor and a minimum

number of passive components. With the internal

reference voltage, the regulated output voltage is at a

nominal value of 90V. The EL lamps therefore see ±90V.

The two EL lamps can be turned on and turned off using

two CMOS logic inputs, EN1 and EN2. The driver is

disabled when both EN1 and EN2 are at logic low.

The HV861 has two internal oscillators, a switching

MOSFET, and two high-voltage EL lamp driver

H-bridges. Each driver has its own half-bridge common

output, COM1 and COM2, which significantly minimizes

the DC offset seen by the EL lamp. The frequency for the

switching MOSFET is set by an external resistor

connected between the R SW-Osc pin and the supply pin,

VDD. The EL lamp driver frequency is set by an external

resistor connected between the REL-Osc pin and the VDD

pin. An external inductor is connected between the L X

and VDD pins or VIN for split supply applications.

Depending upon the EL lamp sizes, a 1 nF to 10 nF

capacitor is connected between the C S and ground. As

the switching MOSFET charges the external inductor

and discharges it into the capacitor at CS, the voltage at

CS starts to increase. Once the voltage at C S reaches a

nominal value of 90V, the switching MOSFET is turned

off to conserve power.

EL lamp dimming can be accomplished by applying a

PWM logic signal to the PWM pin. The EL lamp

brightness will be inversely proportional to the PWM duty

cycle. The HV861 can also slowly turn on or turn off the

EL lamp, giving a fade on/off appearance.

Package Type

See Table 2-1 for pin information.

16-lead WQFN

(Top view)

1 12

5 6 7 8

13141516

VREF VREG VOUT PWM

EL1

COM1

COM2

EL2

REL-Osc

RSW-Osc

VDD

EN1

EN2 GND LX CS

Low-Noise Dimmable Dual EL Lamp Driver

HV861

DS20005911A-page 2 2023 Microchip Technology Inc. and its subsidiaries 

Functional Block Diagram

VCS

EL1

COM1

EL2

COM2

Output

Drivers

VSENSE

1.26V

VREF

PWM Switch

Oscillator

0 to 88%

2 x EL Freq.

1 x EL Freq.

LXVDD

EN1

EN2

RSW-Osc

VREG

VOUT

GND

REL-Osc

PWM VREF

EL1 Enable

EL2 Enable

60pF

 2023 Microchip Technology Inc. and its subsidiaries DS20005911A-page 3

HV861

Typical Application Circuit

100μH

3.3MΩ

2.0MΩ

825kΩ

VDD = 3.0V

0.1μF

2.2μF

Input Logic Control:

ON = 1.5 to VDD

OFF = 0 to 0.2V

GND

EN1

VDD

16 13

PWMVREF

EN2

RSW-Osc

REL-Osc

VREG VOUT LX CS

EL1

COM1

EL2

COM2

HV861

EL1

EL2

3.3nF

100V NPO

1N4148

4.7μF

VIN = 3.2 to 4.2V

Especificaciones del producto

Marca:	Microchip
Categoría:	No categorizado
Modelo:	HV861
Color del producto:	Wit
Peso.:	1360 g
Ancho:	157.4 mm
Profundidad:	340.3 mm
Altura:	137.1 mm
Longitud del cable:	- m
Amable:	Stoomstrijkijzer
Apagado automático:	Nee
Función de pulverización:	Ja
Versión de vapor continuo:	- g/min
Función de vapor vertical:	Ja
Rendimiento de impulso de vapor:	- g/min
poder del hierro:	1200 W