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PDF SR036SG Data sheet ( Hoja de datos )
| Número de pieza | SR036SG | |
| Descripción | Inductorless / Dual Output Off-Line Regulators | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SR036SG (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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SR036/SR037
SR036
SR037
Demo Kit
Available
Inductorless, Dual Output Off-Line Regulators
Features
❑ Accepts peak input voltages up to 700V
❑ Operates directly off of rectified 120V AC or 240V AC
❑ Integrated linear regulator
❑ Minimal power dissipation
❑ No high voltage capacitors required
❑ No transformers or inductors required
Applications
❑ 3.3V or 5.0V power supplies
❑ SMPS house keeping power supplies
❑ White goods
❑ Appliances
❑ Small off-line low voltage power supplies
❑ Lighting controls
General Description
The Supertex SR036 and SR037 are inductorless, dual output
off-line controllers. They do not require any transformers,
inductors, or high voltage input capacitors. The input voltage,
HVIN, is designed to operate from an unfiltered full wave
rectified 120V or 240V AC line. It is designed to control an
external N-channel MOSFET. When HVIN is between VGS(th) to
40V, where VGS(th) is the threshold voltage of the external
MOSFET, the external N-channel MOSFET is turned on allowing
it to charge an external capacitor connected to VSOURCE. An
unregulated DC voltage will develop on VSOURCE. Once HVIN is
above 45V, the N-channel MOSFET is turned off. The maximum
gate voltage for the external MOSFET is 24V. The unregulated
voltage is approximately 18V. The SR036 also provides a
regulated 3.3V whereas the SR037 provides a regulated 5.0V.
WARNING!!! Galvanic isolation is not provided. Dangerous
voltages are present when connected to the AC line. It is
the responsibility of the designer to assure adequate
safeguards are in place to protect the end user from
electrical shock.
SR03x Typical Application Circuit
120VAC
or
240VAC
~18V Unregulated
100µF
SR036
or SR037
VSOURCE
VOUT
SR036: VOUT=3.3V Regulated
SR037: VOUT=5.0V Regulated
1.0µF
06/13/02
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex prod1ucts, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
1 page  
Applications Information, continued
SR036/SR037
120VAC
or
240VAC
Fuse
ON/OFF
VN2460N8
1KΩ
220µF
Gate
Source
HVIN SR036 VOUT
or SR037
TN2106K1
GND
1µF
VUNREG
IOUT typical 40mA
(IUNREG + IREG)
VREG
Figure 2: Example Circuit with Enable Control
Figure 2 is an example circuit using the SR036 or SR037 along
with a Supertex VN2460N8 MOSFET to generate an unregu-
lated voltage of approximately 18V and a regulated voltage of
3.3V for the SR036 or 5.0V for the SR037. The combined total
output current is typically 40mA. The TN2106K1 in series with a
1KΩ resistor can be added for applications requiring an enable
control.
120VAC
or
240VAC
Fuse
VN2460N8
2N3904
220µF 10KΩ
Gate
Source
HVIN SR036 VOUT
GND
1µF
Vz
5.6V
1MΩ
Vout1=5.0V
1µF
Vout2=3.3V
Figure 3: Generating Two Regulated Voltages
For applications requiring two regulated voltages, an inexpen-
sive discrete linear regulator can be added to regulate the
unregulated output as show in Figure 3. The discrete linear
regulator consists of a Zener diode, a resistor and a bipolar
transistor. The regulated voltage, Vout1, is determined by the
Zener diode voltage minus the base-to-emitter voltage drop of
0.6V. Figure 3 uses a 5.6V Zener diode to obtain a 5.0V output.
Different Zener diode voltages can be used to obtain different
regulated output voltages.
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SR036SG.PDF ] | |
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