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TC2574-VPA Datenblatt(PDF) 10 Page - TelCom Semiconductor, Inc

Teilenummer TC2574-VPA
Bauteilbeschribung  0.5A Step-Down Switching Regulator
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Hersteller  TELCOM [TelCom Semiconductor, Inc]
Direct Link  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC2574-VPA Datenblatt(HTML) 10 Page - TelCom Semiconductor, Inc

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TC2574
10
TC2574-1 1/6/00
0.5A Step-Down Switching Regulator
Procedure (Adjustable Output Version: TC2574-ADJ) (Continued)
Procedure
Example
5. Output Capacitor Selection (COUT )
A. Since the TC2574 is a forward–mode switching regulator
with voltage mode control, its open loop 2–pole–1–zero
frequency characteristic has the dominant pole–pair
determined by the output capacitor and inductor values.
For stable operation, the capacitor must satisfy the
following requirement:
COUT ≥ 13,000
VIN(max)
[
µF]
VOUT x L[µF]
B. Capacitor values between 10
µF and 2000µF will satisfy
the loop requirements for stable operation. To achieve an
acceptable output ripple voltage and transient
response, the output capacitor may need to be several
times larger than the above formula yields.
C. Due to the fact that the higher voltage electrolytic capaci-
tors generally have lower ESR (Equivalent Series
Resistance) numbers, the output capacitor’s voltage
rating should be at least 1.5 times greater than the output
voltage. For a 5.0V regulator, a rating of at least 8.0V is
appropriate, and a 10V or 16V rating is recommended.
5. Output Capacitor Selection (COUT )
A.
COUT ≥ 13,300 x
40
22.2
µF
24 x 1000
To achieve an acceptable ripple voltage, select COUT
100
µF electrolytic capacitor.
Table 1. Diode Selection Guide gives an overview about through-hole diodes for an effective design.
1.0 Amp Diodes
VR
Schottky
Fast Recovery
20V
1N5817
MBR120P
30V
1N5818
MUR110
MBR130P
(rated to 100V)
40V
1N5819
MBR140P
50V
MBR150
60V
MBR160


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