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PDF SR036DB1 Data sheet ( Hoja de datos )
| Número de pieza | SR036DB1 | |
| Descripción | Inductorless Switching Power Supply | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
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Introduction
The Supertex SR036 is an inductorless, dual output off-line
regulator intended for 120/240VAC line operation. The
operating principle is to activate a pass element between
line and load only when the input voltage is lower than a
certain value. Thus conduction only occurs with a low
voltage drop across the pass element, resulting in more
efficient operation compared to a standard linear regulator.
The SR036DB1 demo board contains all the circuitry
needed to supply a low-current (<40mA) load. Included are
input protection circuitry, a full wave bridge rectifier, a pass
element, and output capacitors.
SR036DB1
Inductorless Switching Power Supply
Specifications
AC Input
Output Voltages
VUNREG
VREG
Output Current
IUNREG + IREG
Efficiency
ACIN=120VAC 60Hz, IU=40mA, IR=0mA
24VAC to 264VAC
40Hz to 100Hz
18V±20%
3.3V ±10%
40mA @ 120VAC
30mA @ 240VAC
40% typ
Board Layout and Connections
ACIN
Z1
F1
Q1
D1
IC1 C1
C2
WARNING!!!
Do not connect to scope ground or to the ground of other
earth-grounded instruments. Doing so will short the AC line,
resulting in damage to the circuit and/or instrument. Either
use an isolation transformer on the AC line, use a differential
probe, or use a floating, battery-powered instrument to make
measurements.
GND
VREG
VUNREG
WARNING!!!
No galvanic isolation. Dangerous voltages are
present when connected to the AC mains.
ACIN
Connect to the AC line. Neutral to top, hot to bottom.
GND
Circuit common.
Note that since galvanic isolation is not provided, connecting
this point to an earth-grounded instrument (such as an
oscilloscope) will short the AC line, resulting in circuit and/or
instrument damage.
Also note that GND may be at a higher potential with respect
to earth ground, even if the AC is switched off. Use caution!
Do not connect to earth-ground.
VUNREG
The unregulated output. Nominal output voltage is 18 volts.
This output will have a certain amount of 120Hz ripple,
depending on load.
Do not connect to earth-grounded loads.
VREG
The regulated output. 5V nominal output voltage.
Do not connect to earth-grounded loads.
Fuse
The AC input is fused to protect against overloads. It should
be replaced with a 125mA, 250V standard 3AG fuse.
16APR02
1
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| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet SR036DB1.PDF ] | |
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