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SR086 Datasheet(PDF) 5 Page - Supertex, Inc

Part # SR086
Description  Adjustable Off-Line Inductorless Switching Regulator
Download  7 Pages
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

SR086 Datasheet(HTML) 5 Page - Supertex, Inc

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5
NR040306
SR086/SR087
Data Sheet Application Section:
Typical Application Circuit
Output Voltage*
V
OUT may be adjusted in the range of 9V to 50V*‚ by changing
feedback resistor R
5 according to the following equation.
Leave R
6 at 12.4kΩ or less - it assures a minimum 100µA
load required for the proper operation of the SR087. Change
R
3 and R4 according to the R3+R4 equation below. Select
C
2 and C3 with appropriate voltage ratings. For C3, use a
low ESR capacitor with an adequate ripple current rating
(800mA
RMS). Use ceramic for C2.
Since V
REG is a linear regulator supplied from VOUT, the maxi-
mum current available from V
REG is reduced as VOUT is in-
creased due to power considerations.
or 60mA, whichever is less.
Input Voltage
To reduce standby power for 230VAC-only applications,
or for supply voltages less than 90Vrms, R
3 and R4 should
be changed according to the R
3+R4 equation below. R1+R2
should remain at 400kΩ or less. Two resistors in series
are employed to ensure adequate creepage distances for
230VAC operation. For 120VAC-only applications, single re-
sistors may be employed.
Output Ripple*
Storage capacitor C
3 was sized to provide about 2VP-P ripple
at 100mA load (I
OUT + IREG). For lighter loads, C3 may be re-
duced. Conversely, C
3 may be increased for lower ripple.
Use a low ESR capacitor with an adequate ripple current
rating (800mA
RMS for 100mA loads). Efficiency and output
current capability may drop with increased capacitance be-
cause of a smaller conduction angle associated with lower
ripple. Due to feedback hysteresis, ripple cannot be reduced
below 4%.
*V
REG requires at least 4V of headroom. Therefore, VOUT, including ripple,
must not fall below 9V for the SR087, or below 7.3V for the SR086.
RR
V
OUT
56
125
1
=−
.V
I
V
REG(max)
OUT
=
15
5
. W
V
V
II
fC
RIPPLEP P
OUT
REG
IN
()
+
2
3
R
3 + R4 Equation:
RR
V
X
V
V
X
IN
34
1
2
25
+
() <
()
cos
π
μA
2VIN2 - VX2
-
where V
X = VOUT + 15V
Use the minimum anticipated RMS value for V
IN.
Take resistor tolerance into account, selecting the
next lower standard value. Choosing a lower value
has no effect other than higher standby power.
VGD
VIN
GATE
VOUT
GND
FB
VREG
5VDC
VREG
VOUT
12.6VDC
VIN
90VAC to
270VAC
50/60Hz
EN
*R
3
510k
*R
1
200k
C
1
100nF
C
2
1.0µF
C
3
470µF
R
5
113kΩ
R
6
12.4kΩ
R
7
100k
D
1
1.0kV
1A
Z
1
275V
50A
F
1
1.00A
EN
Q
1
STGD5NB120SZ
*R
2
200k
*R
4
510k
1
2
4
3
5
6
7
8
C
4
100nF
IC1
SR087
* Two resistors used in
series for reasons of
high voltage creepage
and resistor voltage
rating.


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