參數(shù)資料
型號(hào)： S-8521F50MC-BQJ-T2
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 15/37頁(yè)
文件大?。?/td> 599K
代理商： S-8521F50MC-BQJ-T2
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.7.2
S-8520/8521 Series
Seiko Instruments Inc.
15
Precautions:
Install the external capacitors, diode, coil, and other peripheral components as close to the IC as possible,
and secure grounding at a single location.
Any switching regulator intrinsically produces a ripple voltage and spike noise, which are largely dictated
by the coil and capacitors in use. When designing a circuit, first test them on actual equipment.
The overload protection circuit of this IC performs the protective function by detecting the maximum duty
time (100%). In choosing the components, make sure that overcurrents generated by short-circuits in the
load, etc., will not surpass the allowable dissipation of the switching transistor and inductor.
Make sure that dissipation of the switching transistor will not surpass the allowable dissipation of the
package. (especially at the time of high temperature)
200
100
0
50
100
150
P
P
D
(mW)
d
Temperature Ta (
0
C)
0
Figure 10 Power dissipation of an SOT-23-5 Package (When Not Mounted)
Seiko Instruments Inc. shall not be responsible for any patent infringement by products including the S-
8520/8521 Series in connection with the method of using the S-8520/8521 Series in such products, the
product specifications or the country of destination thereof.
Application Circuits:
1.
External adjustment of output voltage
The S-8520/21 Series allows you to adjust the output voltage or to set the output voltage to a value
over the preset output voltage range (6V) of the products of this series, when external resistances RA,
RB, and capacitor CC are added, as illustrated in Figure 11. Moreover, a temperature gradient can be
obtained by inserting a thermistor or other element in series with RA and RB.
S-8520/21 Series
ON/OFF
CC
RA
RB
D1
V
OUT
V
SS
+
V
IN
OUT
EXT
+
Reference Voltage
Source with
Soft-Start
+
--
R 2
R 1
PWM or
Switched Control
Circuit
Oscillation
Cirucuit
Figure 11
The S-8520 and 21 Series have an internal impedance of R1 and R2 between the V
OUT
and the V
SS
pin,
as shown in Figure 11.
相關(guān)PDF資料
PDF描述
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S0370W MB 32C 32#20 SKT PLUG
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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