HV9901DB1 Просмотр технического описания (PDF) - Supertex Inc

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производитель

HV9901DB1

Universal Relay Driver

Supertex Inc 

F1

250mA

VIN

GND

R1

226kΩ

R2

8.25kΩ

VCC

5.0V @ 1mA

C5

1.0µF

HV9901DB1 Schematic

D1

DF06

D2

C1

100nF

S1J

VIN

C2

4.7µF

VDD

VREF

C3

100nF

H/D

Int

Reg

VREF

PWM

C4

1.0µF

VCC

R3

374kΩ FB

R4

124kΩ

Aux

Reg

D3

ES1J

C

NC

NO

K1

NAIS JS1-5V

INT

EXT

RELAY

SYNC

SYNC

GT

Q1

CS

VN2450

RT

R5

11Ω

R6

1.21MΩ

POL

ENI

ENO

EN

R7

270kΩ

VCC

1

0

POL

Modifications

External Relay

Connect the coil of the external relay to the External Relay

terminals and move the Relay Selector shunt to the Ext

position.

Pull-in Current, Pull-in Time, and Hold Current

For use with other relays, these parameters may be changed

via resistors R1 and R2 and capacitor C4. Refer to the HV9901

data sheet for details.

Monitoring Relay Current

For the on-board relay, coil current may be monitored by

replacing the Relay Selector shunt with either a wire loop (for

current probe use) or with a low value sense resistor (for

voltage probe use). Remember that galvanic isolation is not

provided! See warnings on the first page.

Switching Frequency

To change the PWM switching frequency, change R6 according

to the following equation:

f PWM

= 3.23kHz +

21.8GHz ⋅ Ω

R6

This equation is valid for frequencies 25kHz and above. Be

advised that frequencies below 20kHz may cause the relay coil

to emit audible noise. And avoid higher frequencies that

approach the coil’s resonant frequency.

VCC

As provided, the HV9901DB1 supplies 5V for external circuitry.

Other volltages in the range 2.0V to 5.5V may be obtained by

changing R3. Current rating remains at 1mA.

VCC

= 1.25V1 +

R3

R4



Note that changing VCC also changes the Enable logic levels.

VEN (lo) < 0.3VCC

VEN (hi) > 0.7VCC

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