Microchip SR10DB1 Handleiding

Microchip Niet gecategoriseerd SR10DB1

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Supertex inc.
Supertex inc.
www.supertex.com
SR10DB1
Doc.# DSDB-SR10DB1
A040113
- DC Output +
24V
12V
6V
ADJ
HIGH EVOLTAG
Supertex SR10DB1
COUT
AC Input
90-275VRMS
50/60Hz
H
N
+
–
Load
R
FB1
and R
FB2
optional for output voltages other
than 6, 12, or 24V. Adjustment range is 6 - 28V.
Pre-configured for 9V. Pads for 0603 and 0805.
DC Output:
6, 12, 24V or
adjustable 6 - 28V.
Jumper-selectable full-wave
or half-wave rectification.
Both jumpers must be in the
same position, left or right.
Jumper-selectable output voltage.
Jumper must be present. When in
the ADJ position, RFB1 and RFB2
must be present.
Output minus is
connected to AC line
neutral when configured
for half-wave rectification.
RFB1
RFB2
D2
D1
D4
D3
RBL
RLIM
CS
DOUT
C
FB
One lead must always
be in this position
Socketed components.
Accomodates various capacitor sizes
IC1
H Input N AC
Rect
Half
Full
VOUT
Board Layout and Connection Diagram
Inductorless Switching
Power Supply Demoboard
Speciîš¿cations
Parameter Value
AC Input 90VAC to 275VAC
50Hz to 60Hz
Output voltage 6V, 12V, 24V ±10%
or 6-28V using divider
Output current1up to 50mA
No-load input power 1as low as 20mW
Efîš¿ciency1up to 75%
Actual board size 88mm x 28mm
Introduction:
The Supertex SR10 is an inductorless switching power sup-
ply controller intended for operation directly from a rectiîš¿ed
120/240VAC line. Due to the capacitor-coupled, switched
shunt topology (CCSS), it exhibits low standby power and
good efîš¿ciency while employing no magnetics nor high volt-
age electrolytic capacitors.
To meet a wide variety of applications, the SR10DB1 is
highly conîš¿gurable. Many components are socketed. Half or
full-wave rectiîš¿cation is jumper-selectable. Output voltage is
jumper-selectable to 3 îš¿xed voltages or may be set anywhere
in the range of 6 - 28V using an on-board feedback divider.
AC Input (H and N)
Connect to the AC line. The ‘H’ terminal should be connected
to the AC line hot conductor. The ‘N’ terminal should be con-
nected to the AC line neutral conductor. When conîš¿gured for
half-wave rectiîš¿cation, the N terminal is connected to the DC
output minus (–) terminal.
DC Output (+ and –)
Connect the load to these terminals. Do not connect earth-
grounded loads or test equipment without using an isolation
transformer on the AC line.
Output voltage is jumper-selectable at 6, 12, or 24V, or it
may be set in the range of 6 - 28V using the R FB feedback
divider and setting the jumper to ADJ.
Notes:
1. Dependent upon conîš¿guration and degree of transient protection.
2
SR10DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-SR10DB1
A040113
Schematic
D1-4
1N4001
RLIM
CS
RBL
fixed 6, 12, 24, or 9V
(adjustable from 6 - 28V via RFB1)
V
OUT
COUT
1.0mF
RFB1
422kΩ
DOUT
1N4001
VIN
90-275VAC
50-60Hz
RTN
OUT
SR10
PGND
SH
FB
AGND
D6
D12
D24
CFB
470pF
24V
12V
6V
ADJ
V
OUT
RFB2
68.1kΩ
Rect
Half Full
D1
D3D4
D2
1 8
7
6
5
4
32
Designation Description Value Rating Mfg PN
RLIM Resistor, fusible 2W —22Ω any
RBL Resistor 1/4W —4.7MΩ any
RFB1 Resistor 1/4W —422kΩ any
RFB2 Resistor 1/4W —68.1kΩ any
CSCapacitor, lm 220nF to 2.2µF 275VAC,X2 —any
COUT Capacitor, alum 220µF min —35V any
CFB Capacitor, ceramic NPO 470pF 6V —any
D1 - 4 Rectier any— 1A, 50V 1N4001
DOUT Rectier any— 1A, 50V 1N4001
IC1CCSS regulator — — Supertex SR10
Bill of Materials
Socketed Components
The SR10DB1 is provided with all components pre-installed.
Other components may be substituted for the on-board com-
ponents to meet other requirements.
Refer to the above schematic and BOM, and the drawing
and photo on page 1 to determine the proper locations for
the components.
Output Voltage
Fixed output voltages of 6V, 12V, or 24V may be selected by
setting the appropriate jumper on the VOUT header.
For other output voltages, the on-board resistive feedback
divider may be used to provide any voltage in the range of
6 - 28V. To maintain a minimum 15µA through the feedback
divider, only RFB1 should be changed.
RFB1 = RFB2
VOUT -1 = 68.1kΩ
VOUT -1
VFB
1.25V
Output Current (CS selection)
Output current is primarily dependent on input voltage, CS
value, and rectiîš¿cation (full or half). Given the minimum input
voltage and choice of rectiîš¿cation, the minimum value of CS
3
SR10DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-SR10DB1
A040113
is given by the following equations. Don’t forget to take toler-
ances into account. The SR10 is powered by VOUT, so the
available output current is reduced by the SR10’s operating
current (150µA nom, 200µA max). Current may also be re-
duced ~5% due to losses.
For standard capacitance values, see the table on page 4.
Full-wave:
CS ≥ IOUT
4ƒIN (VIN √2 - VOUT - 3VD )
Half-wave:
CS ≥ IOUT
Æ’IN
(2VIN √2 - VOUT - 2VD )
where: IOUT is the maximum output current
fIN is the AC line frequency
CS is the series cap on the AC line
VIN
is the RMS AC line voltage
VOUT is the DC output voltage
VD is the diode forward voltage (~700mV)
Limiting Resistor (RLIM
)
The limiting resistor in series with the AC line is to protect
against transients on the AC line. For safety reasons it is
fusible and is the most upstream component on the AC line.
Higher values provide greater protection but at the expense
of higher losses.
PLIM ≈ (VIN • 2πƒIN • CS )2 • RLIM
Output Capacitor (COUT
)
The output capacitor serves 2 functions - it supplies the load
when the shunt is on, and helps absorb transients on the AC
line. The supplied value may be lowered but at the expense
of higher ripple voltage and increased output voltage during
a transient.
Input Power Measurements
The high ratio between the imaginary and real power com-
ponents makes power measurements difîš¿cult. To make ac-
curate measurements of real power, the imaginary compo-
nent may be eliminated by measuring input voltage after CS.
This excludes CS losses, but AC rated îš¿lm capacitors exhibit
very low losses, so the error is minimal.
Since the PCB is laid out with RLIM upstream of CS for safety
reasons, it must be relocated after CS if RLIM losses are to be
included.
Do not connect earth-grounded instruments when operating
off the AC line! Use either battery-powered equipment, high
voltage differential probes, or an isolation transformer on the
AC line. Note that many Variacs (variable transformers) do
not provide isolation.
Ideally, RBL should be removed. Its contribution to loss is ap-
proximately VIN
2 / RBL
Since the input current is not a perfect sine wave, real power
cannot be obtained by simply multiplying RMS input current
by RMS input voltage. One way to make correct measure-
ments is by multiplying instantaneous current by instanta-
neous voltage on a time-point basis and taking the average
over an integer number of 50/60Hz cycles. At low load cur-
rents the shunt turns off only occasionally, requiring a long
time window for accurate power measurements.
This measurement technique may be performed on most
digital oscilloscopes. When taking the average, be sure to
window the average over an integer number of cycles.
Driving LEDs
The SR10 can be conîš¿gured to provide a constant-current
output to drive LEDs. A current sense resistor (RSNS) is used
to convert LED current to the 1.25V feedback voltage re-
quired by the SR10.
ILED = 1.2V
RSNS
R´LIM
CS
VIN
RLIM
short
Measure
VIN here
R
BL
current
probe
IIN
COUT
1.0mF
ZOVP
27V
D
OUT
1N4001
–
OUT
SR10
PGND
SH
AGND
D6
D12
D24
FB
CFB
470pF
24V
12V
6V
ADJ
V
OUT RSNS
1 8
7
6
5
4
32
+
RB
2kΩ
Set VOUT
to ADJ Replace RFB2
with 2 resistors
Replace RFB1
with a Zener

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SR10DB1

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