Switching Regulators. SR086 Datasheet

SR086 Regulators. Datasheet pdf. Equivalent

SR086 Datasheet
Recommendation SR086 Datasheet
Part SR086
Description Adjustable Offline Inductorless Switching Regulators
Feature SR086; SR086/SR087 Adjustable Offline Inductorless Switching Regulators Features • Efficient Operation wit.
Manufacture Microchip
Datasheet
Download SR086 Datasheet





Microchip SR086
SR086/SR087
Adjustable Offline Inductorless Switching Regulators
Features
• Efficient Operation without Magnetics
• No High-voltage Capacitors
• Adjustable Main Output Voltage (9V to 50V)
• Additional Internal Linear Regulator:
- 3.3V for SR086
- 5V for SR087
• Up to 100 mA Combined Output Current
• Single BOM for 120 VAC/230 VAC
• Built-in Soft Start
• Less than 200 mW Standby Power
Applications
• White Goods
• Household Appliances
• Lighting Controls
• Circuit Breakers
• Keep-alive Supplies
General Description
The SR086/SR087 are inductorless switching
regulators designed to operate directly from a rectified
AC line. The operating principle is to turn on a pass
transistor when the rectified AC is below the output
voltage and to turn it off when the output voltage
reaches a specific level. The ICs feature an adjustable
main output voltage of 9V to 50V and an additional
fixed output of 3.3V for SR086 and 5V for SR087.
Efficiencies of around 55% may be realized for loads
up to 1W in 120 VAC applications and about 50%
efficiencies for loads up to 800 mW in 230 VAC
applications.
A logic-level enable input allows the SR086/SR087 to
be disabled—useful when they are employed as
keep-alive power supplies.
Package Type
8-lead SOIC
(with Heat Slug)
(Top view)
VIN 1
EN 2
GND 3
VREG 4
Heat Slug
8 GATE
7 VGD
6 VOUT
5 VFB
Backside on the SOIC package is at ground potential and may be connected to
ground or left unconnected. See Table 2-1 for pin information.
WARNING
Galvanic isolation is not provided. Dangerous voltages are present when connected to the AC line. It is
the responsibility of the designer using the SR086/SR087 to ensure that adequate security measures are
in place to protect the end user from electrical shock.
The circuits shown in this data sheet are not guaranteed to meet surge and conducted EMI
requirements. The effectiveness of these circuits may vary with a particular application. The designer
must conduct tests to ascertain compliance with applicable standards and regulations.
2017 Microchip Technology Inc.
DS20005544A-page 1



Microchip SR086
SR086/SR087
Functional Block Diagrams
1.25A
90 to
270VAC
50/60Hz
275V
50A
1.0kV
1.0A
R
PD
390kΩ
RGD
1.1MΩ
VIN
STGD5NB120SZ
GATE
CGD
100nF
VGD
COUT1
1.0μF
VOUT
9.0 - 50VDC
COUT
470μF
13V
R
S
Q
R = RFB(HI)
FB(LO)
VOUT - 1
1.25V
Upper circuitry
powered by VGD - VOUT
Lower circuitry
powered by VOUT - GND
EN
SR086
Level
Translator
1.25V
REG
GND
FB
VREG
3.3V
C
REG
100nF
RFB(LO)
12.4kΩ
90 to
270VAC
50/60Hz
1.25A
275V
50A
1.0kV
1.0A
RPD
390kΩ
RGD
1.1MΩ
VIN
STGD5NB120SZ
GATE
CGD
100nF
VGD
COUT1
1.0μF
VOUT
9.0 - 50VDC
COUT
470μF
13V
R
S
Q
R = RFB(HI)
FB(LO)
VOUT - 1
1.25V
Upper circuitry
powered by VGD - VOUT
Lower circuitry
powered by VOUT - GND
Level
Translator
EN
SR087
1.25V
REG
GND
FB
VREG
5.0V
C
REG
100nF
RFB(LO)
12.4kΩ
DS20005544A-page 2
2017 Microchip Technology Inc.



Microchip SR086
SR086/SR087
Typical Application Circuits
90 to
270VAC
50/60Hz
1.25A
275V
50A
1.0kV
1.0A STGD5NB120SZ
390kΩ
1.1MΩ
100nF
1.0μF
470μF
Enable
GATE VGD VOUT
VIN FB
SR086
EN VREG
GND
3.3V
@60mA
100nF
VOUT
9.0 - 50VDC
@100mA - IREG
R1 = R2
VOUT - 1
1.25V
R2
12.4kΩ
1.25A
90 -
270VAC
50/60Hz
275V
50A
1.0kV
1.0A
390kΩ
STGD5NB120SZ
1.1MΩ
100nF
1.0μF
GATE VGD VOUT
470μF
VOUT
9.0 - 50VDC
@ 100mA - IREG
R1 = R2
VOUT - 1
1.25V
Enable
VIN SR087 FB 5.0V
@60mA
EN VREG
GND
100nF
R2
12.4kΩ
2017 Microchip Technology Inc.
DS20005544A-page 3





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