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零件编号 | SJ1117-18Q | ||
描述 | Adjustable and Fixed Voltage Regulator | ||
制造商 | AUK | ||
LOGO | |||
1 Page
SJ1117xxx
Adjustable and Fixed Voltage Regulator
◈ Descriptions
The SJ1117 series of positive adjustable and fixed regulators are designed to provide 1A with high efficiency.
All internal circuitry is designed to operate down to 1.1V input to output differential.
The SJ1117 offers current limiting and thermal shutdown and over voltage protection.
◈ Features
• Adjustable or fixed output(1.2V, 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5V)
• Output current of 1A
• Safe Operating Area(SOA) Protection
• Over Voltage Protection (OVP)
• Over Current Protection (OCP)
• Thermal shutdown protection
• Low dropout, 1.1V Typical at 1A output current
• Operating temperature range : -40℃ ~ +125℃
• Halogen-Free Package is Available
• High Level ESD Protection : 400V(MM), 4KV(HBM)
◈ Typical Applications
VIN
IN SJ1117-XX OUT
+ CIN
10uF
GND
VOUT
+ CO
10uF
VIN
+ CIN
10uF
IN
SJ1117A
ADJ
OUT
VOUT
R1
125Ω
+ CO
10uF
R2
225Ω
Fig.1 Fixed Voltage Regulator
Fig.2 Adjustable Voltage Regulator
※ Notes
Vout
=
VADJ
× (1+
R2
R1
)
+
I ADJ
×
R2
1) CIN needed if device is far from filter capacitors
2) CO minimum value required for stability
KSD-I0T005-008
1
SJ1117xxx
◈ Application Note
Input Bypass Capacitor (CIN)
An Input capacitor is recommended. A 10μF tantalum capacitor on the input is a suitable bypassing for all
applications.
Adjust Terminal Bypass Capacitor(CADJ)
The adjust terminal can be bypassed to ground with a bypass capacitor to improve ripple rejection
This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At
any ripple frequency, the impedance of the CADJ should less than R1 to prevent the ripple from being
amplified
1
(2π × f RIPPLE × C ADJ )
〈
R1
The R1 is the resistor between the output and the adjust pin.
Output Capacitor(COUT)
The output capacitor(COUT) is critical in maintaining regulator stability, and must meet required
conditions for both minimum amount of capacitance and ESR. The minimum COUT required is
10μF(tantalum capacitor). Any increase of the COUT will merely improve the stability and transient
response. The ESR of the COUT should range between 0.3Ω - 22Ω. In the case of the adjustable regulator,
when the CADJ is used, a larger COUT (22μF) is required.
Output Voltage
The SJ1117 develops a 1.25V reference voltage between the output and the adjust terminal (See Fig.9).
By placing a resistor between these two terminals, a constant current is caused to flow through R1 and
down through R2 to set the overall output voltage. Normally this current is chosen to be the specified
minimum load current. Because IADJ is very small and constant when compared to the current through R1,
it represents a small error and can usually be ignored. For fixed voltage devices R1 and R2 are included in
the device.
VIN
+ CIN
IN
SJ1117
ADJ
OUT
VREF
VOUT
+ CO
R1
IADJ
( )VOUT
= VREF
1
+
R2
R1
+ I ADJ × R2
R2
Fig.13 Basic Adjustable Regulator
KSD-I0T005-008
8
◈ TO-220F-3L Outline Dimension (unit : mm)
SJ1117xxx
KSD-I0T005-008
16
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页数 | 18 页 | ||
下载 | [ SJ1117-18Q.PDF 数据手册 ] |
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