Microchip SR10DB1 Handleiding

Microchip Niet gecategoriseerd SR10DB1

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Supertex inc.

www.supertex.com

SR10DB1

Doc.# DSDB-SR10DB1

A040113

- DC Output +

24V

12V

ADJ

HIGH EVOLTAG

Supertex SR10DB1

COUT

AC Input

90-275VRMS

50/60Hz

–

Load

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

RBL

RLIM

DOUT

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

Speci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

Ef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 rectied

120/240VAC line. Due to the capacitor-coupled, switched

shunt topology (CCSS), it exhibits low standby power and

good efciency while employing no magnetics nor high volt-

age electrolytic capacitors.

To meet a wide variety of applications, the SR10DB1 is

highly congurable. Many components are socketed. Half or

full-wave rectication is jumper-selectable. Output voltage is

jumper-selectable to 3 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 congured for

half-wave recti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 conguration and degree of transient protection.

SR10DB1

Supertex inc.

www.supertex.com

Doc.# DSDB-SR10DB1

A040113

Schematic

D1-4

1N4001

RLIM

RBL

fixed 6, 12, 24, or 9V

(adjustable from 6 - 28V via RFB1)

OUT

COUT

1.0mF

RFB1

422kΩ

DOUT

1N4001

VIN

90-275VAC

50-60Hz

RTN

OUT

SR10

PGND

AGND

D12

D24

CFB

470pF

24V

12V

ADJ

OUT

RFB2

68.1kΩ

Rect

Half Full

D3D4

1 8

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 rectication (full or half). Given the minimum input

voltage and choice of rectication, the minimum value of CS

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

ƒIN

(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 dif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 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 con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

VIN

RLIM

short

Measure

VIN here

current

probe

IIN

COUT

1.0mF

ZOVP

27V

OUT

1N4001

–

OUT

SR10

PGND

AGND

D12

D24

CFB

470pF

24V

12V

ADJ

OUT RSNS

1 8

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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