Microchip HV9922DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

HV9922DB2

Doc.# DSDB-HV9922DB2

A032913

General Description

The HV9922DB2 is a universal input, ofine, non-isolated

auxiliary power supply using Supertex’s HV9922 constant

current switching regulator IC. The output voltage is

regulated to 23V +/-5% and is referenced to the negative

side of the diode bridge rectier (i.e. ground of the rectied

DC voltage). The demoboard is protected against output

open circuit and short circuit conditions and meets FCC

Class B (residential) EMI limits.

The HV9922 acts as a constant 50mA current source which

is sourced into an output zener diode. On the demoboard, a

22V zener diode is used at D2 to regulate the output voltage

to 23V within +/-5%. Lower output voltages can be obtained

by using an appropriate 2W zener diode in parallel to D2 in

the space provided on the demoboard (D3).

Board Layout and Connection Diagram

Ofine, Non-Isolated, 23V, 45mA

Auxiliary Power Supply

Specications

Parameter Value

Input voltage:85 - 265VAC, 50/60Hz

Output voltage:23V +/-5%

Output current:0 - 45mA

Switching frequency:variable

Full load efciency:50% (at 110V input),

44% (at 220V input)

Open circuit voltage:24V

Output short circuit protection:Included

Dimensions:53.4mm x 38.2mm

Connections:

Input: Connect the input AC voltage between AC1 and AC2

as shown.

Output: Connect the output load between VO+ and VO- as

shown. An ammeter and voltmeter can be connected as

shown to measure the output voltage and load current if

desired.

WARNING:Do not use earth grounded test instruments or

loads! Doing so will short the AC line, resulting in damage

to the instrument, load and/or the HV9922DB2. Use an iso-

lated supply or high voltage differential probes when testing

the circuit.

There is no galvanic isolation. Dangerous voltages are pres-

ent when connected to the AC line.

+A

85 - 265VAC, 50/60Hz

+

V

Product specificaties