HV881 datasheet(7/8 Pages) SUTEX

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HV881

Supertex inc.

1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888

www.supertex.com

Pin Configuration and External Component Description

Pin #

Pin Name Description

REL-Osc

The external resistor from REL-Osc to VDD sets the EL frequency. The EL frequency is inversely

proportional to the external R

EL resistor value. Reducing the resistor value by a factor of two will

result in increasing the EL frequency by two.

RSLOPE

The external resistor, R

SL, from RSLOPE to VDD, controls the EL1 - EL16 outputs discharge time.

The equation for the EL1 - EL16 outputs typical fall time is:

f(typ) = VCS / ((VDD - 0.85) / (RSL • 3pF))µs.

RSW-Osc

The external resistor from RSW-Osc to VDD sets the switch converter frequency. The switch con-

verter frequency is inversely proportional to the R

SW resistor value. Reducing the resistor value by

a factor of two will result in increasing the switch converter frequency by two.

VREG

The input voltage to set the V

CS regulation voltage. This pin allows an external voltage source to

control the V

CS amplitude in the range from 0 to 195V.

The output voltage is (403 ± 10%) • V

REG.

The V

REG voltage can also be set by using an external resistor between VREG and VOUT pins.

The output charging rate is inversely proportional to the resistor value.

VOUT

Switched and voltage divided to one-third the internal reference voltage. An external resistor be-

tween VREG and VOUT pins controls the V

CS charging rate. If this pin is not used, then it should

be left floating.

VDD

The low voltage input supply pin.

GND

Device ground.

1.7V logic input pin to turn the device ON/OFF. A logic high turns ON the device and a logic LOW

turns the device OFF.

9 – 16

EL16 - EL9 EL lamp 16, EL lamp 15 …. EL lamp 9 connections.

COM

The common connection for all the 16 EL lamps.

18 – 25

EL8 - EL1 EL lamp 8, EL lamp 7 …. EL lamp 1 connections.

HVGND

High voltage ground. It should be connected to device ground.

Connect a 0.001µF to 0.01µF 200V capacitor between this pin and ground. This capacitor stores

the energy transferred from the inductor.

SCL

The I2C logic serial clock input pin.

SDA

The I2C logic serial data input pin.

GATE

The gate control pin for the switching MOSFET. The connection for an external MOSFET.

In general, low R

ON MOSFET’s, which can handle more current, are more suitable to drive larger

size lamps. Also a small value inductor should be used. But as the R

ON value and the inductor

value decrease, the switching frequency of the inductor (controlled by R

SW) should be increased

to avoid inductor saturation.

The external MOSFET threshold voltage minimum value should be equal to V

DD or lower.

VDRIVE

Drive voltage for the MOSFET gate voltage. An external bypass capacitor (C

G) is required to

ground.

SEL

The external logic signal input pin to set the EL frequency. If this pin is used, the REL-Osc pin

should be connected to ground.

The frequency input at this pin should be at 50% duty cycle and at eight times the desired EL

output frequency. If this pin is not used then it should be left floating. This pin has an internal pull-

down resistor of 1.0MΩ ± 50%.

Center Pad

Center heat slug, externally connected to Ground.

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