Microchip HV9922DB1 Handleiding

Microchip Niet gecategoriseerd HV9922DB1

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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 rectiîš¿er (i.e. ground of the rectiîš¿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
Speciîš¿cations
Parameter Value
Input voltage: 85 - 265VAC, 50/60Hz
Output voltage: 23V +/-5%
Output current: 0 - 45mA
Switching frequency: variable
Full load efîš¿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
2
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 sufîš¿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 efîš¿ciency of the circuit. If short circuit pro-
tection is not required, R1 can be eliminated. The difference
in efîš¿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 sufîš¿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
Efîš¿ciency: Figs.3 and 4 show the efîš¿ciency of the
HV9922DB2 at 110V input and 220V input respectively. The
efîš¿ciency of the converter without the short circuit protection
resistor is also plotted to show the effect of the resistor on
efîš¿ciency. With the resistor removed, the full load efîš¿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
0
Output Current (mA)
Output Voltage (V)
@110Vac @110Vac
3
Supertex inc.
www.supertex.com
HV9922DB2
Doc.# DSDB-HV9922DB2
A032913
Normal Operation: Fig.5 shows the source voltage (GND
pin) of the HV9922 and the output current during normal op-
eration (full load) at 110VAC and 220VAC.
Output Short Circuit Protection: Fig.6 shows the source
voltage of the HV9922 and the output current waveforms for
output short circuit condition at both 110VAC and 220VAC
inputs.
Input Current Waveshape: Fig.7 shows input voltage and
input current waveforms at 110VAC and 220VAC.
Conducted EMI Measurements: The plot of the conducted
EMI measurements over the frequency range of 150kHz to
30MHz is shown in Fig.8. The limits line corresponding to
FCC Class B is also plotted.
0
10
20
30
40
50
60
70
0 10 20 30 4
0 5
0
Load Current (mA)
Effi (%ciency )
With R1 Without R1
0
10
20
30
40
50
60
0 10 20 30 4
0 5
0
Load Current (mA)
Effi (%ciency )
With R1 Without R1
Fig.5 Voltage Current and Waveforms During Normal Operation
(a) 110VAC (a) 220VAC
(a) 110VAC (a) 220VAC
Fig.6 Voltage Current and Waveforms During Output Short Circuit
Fig.3 Efîš¿ciency of HV9922DB2 at 110VAC Input Fig.4 Efîš¿ciency of HV9922DB2 at 220VAC Input

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9922DB1

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