Microchip HV9922DB1 Manual

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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.

85 - 265VAC, 50/60Hz

Supertex inc.

www.supertex.com

HV9922DB2

Doc.# DSDB-HV9922DB2

A032913

Demoboard Testing:

Normal Operation: Power up the input voltage. Measure

the output voltage and load current. The output voltage will

be regulated to 23V +/- 5%.

Note that, when left in this condition, the output voltage will

slowly drift. This drift is due to the power dissipation in the

zener diode, which causes the zener voltage to drift. This

drift will eventually settle down once the temperature of the

zener diode stabilizes. This drift is not destructive and the

output voltage will not increase more than 5%.

To obtain an output voltage less than 22V, space is provided

on the HV9922DB2 for a zener diode (D3) in parallel with the

existing 22V zener diode. By soldering in an appropriate 2W

zener diode, the HV9922DB2 can be customized to produce

the required output voltage.

Line Regulation: Decrease the load resistance until the

load current reads the full load value of 45mA. Then, vary

the input voltage between 85VAC and 265VAC and note the

output voltage. The output voltage of the HV9922DB2 will

remain in regulation over the entire line range.

Load Regulation: Set the input voltage at a desired value.

Vary the output load so that the load current is in between 0

and 45mA. The output voltage will remain in regulation over

the entire load range.

Short Circuit Test: With the HV9922DB2 operating in a

steady state, connect a jumper across the load (please note

that since there is no galvanic isolation on the demoboard,

this test should be done with care). Notice that the output

current rises to about 50mA and remains there.

The HV9922DB2 is protected against a short circuit by resis-

tor R1 (200 ohm resistor). When the output of the demoboard

is shorted, the 50mA current develops a 10V drop across

R1 to prevent loss of regulation. This voltage is sufcient to

ensure that the inductor L1 does not go into saturation and

thereby protects the circuit. However, this resistor dissipates

about 0.5W of power during normal operation, causing a

drop in the overall efciency of the circuit. If short circuit pro-

tection is not required, R1 can be eliminated. The difference

in efciencies with and without R1 is shown in the Typical

Results section.

Please note that at least 10V of total output voltage (drop

across the D2/D3 combination + drop across R1) is required

to ensure proper operation of the HV9922DB2. A lower volt-

age will not be sufcient to reset the inductor L1, and might

cause the inductor to go into saturation. Thus, if R1 is elimi-

nated, the minimum zener diode that can be used in D3 is

a 10V zener diode. If lower output voltages like 5V are de-

sired, R1 cannot be removed.

Typical Results

Output Voltage Regulation: The regulation of the output

voltage of the HV9922DB2 at various input voltages is shown

in Fig.1 (measured at full load of 45mA). Fig.2 shows the load

regulation of the output voltage at 110VAC and 220VAC.

Fig.1 Line Regulation of Output Voltage

Fig.2 Load Regulation of Output Voltage

Efciency: Figs.3 and 4 show the efciency of the

HV9922DB2 at 110V input and 220V input respectively. The

efciency of the converter without the short circuit protection

resistor is also plotted to show the effect of the resistor on

efciency. With the resistor removed, the full load efciency

increases by about 15% at 110V input and by about 11% at

220V input.

22.80

22.82

22.84

22.86

22.88

22.90

90 140 190 240

Input Voltage (V)

Output Voltage (V)

22.8

23.0

23.2

23.4

23.6

23.8

24.0

24.2

0 10 20 30 4

0 5

Output Current (mA)

Output Voltage (V)

@110Vac @110Vac

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	HV9922DB1

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