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参数资料
| 型号： | TC2576VAT |
| 元件分类： | 稳压器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封装： | TO-220, 5 PIN |
| 文件页数： | 2/25页 |
| 文件大小： | 213K |
| 代理商： | TC2576VAT |
TC2576
10
TC2576-2 12/04/00
3.0A Step-Down Switching Regulator
2001 Microchip Technology Inc.
DS21399A
Procedure (Adjustable Output Version: TC2576-ADJ) (Continued)
Procedure
Example
5. Output Capacitor Selection (COUT )
A. Since the TC2576 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)
[
F]
VOUT x L [F]
B. Capacitor values between 10
F and 2000F 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 ≥ 13,000
25
= 332.5
F
8 x 150
To achieve an acceptable ripple voltage, select COUT
680
F electrolytic capacitor.
Table 1. Diode Selection Guide
Schottky
Fast Recovery
3.0A
4.0-6.0A
3.0A
4.0-6.0A
VR
Through
Surface
Through
Surface
Through
Surface
Through
Surface
Hole
Mount
Hole
Mount
Hole
Mount
Hole
Mount
20V
1N5820
SK32
1N5823
MBR320P
SR502
SR302
SB520
30V
1N5821
SK33
1N5824
50WQ03
MBR330
30WQ03
SR503
SR303
SB530
MUR320
MURS320T3
MUR420
MURD620CT
31DQ03
31DF1
MURD320
HER602
50WF10
HER302
30WF10
40V
1N5822
SK34
1N5825
MBRD640CT
MBR340
30WQ04
SR504
50WQ04
(all diodes
SR304
MBRS340T3
SB540
rated to at
31DQ04
MBRD340
least 100V)
50V
MBR350
SK35
SB550
50WQ05
31DQ05
30WQ05
SR305
60V
MBR360
MBRS360T3
50SQ080
MBRD660CT
DQ06
MBRD360
SR306
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