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| 型号： | TPS62306DRC |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3350 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, QFN-10 |
| 文件页数： | 9/25页 |
| 文件大小： | 831K |
| 代理商： | TPS62306DRC |
www.ti.com
PRODUCT
PREVIEW
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
c +
1
2p
L
C
O
+
1
2p 1 mH
10 mF
+ 50.3 kHz
(2)
high-load transients
d i
dt
(e.g.,
≥ 1600 mA/s).
TPS62300, TPS62301, TPS62302
TPS62303, TPS62304, TPS62305
TPS62306, TPS62320, TPS62321
SLVS528 – JULY 2004
APPLICATION INFORMATION (continued)
The TPS6230x and TPS6232x series of step-down converters have internal loop compensation. Therefore, the
external L-C filter must be selected to work with the internal compensation.
The device has been designed to operate with inductance values between a minimum of 0.7 H and maximum of
6.2 H. The internal compensation is optimized to operate with an output filter of L = 1 H and CO = 10 F. Such
an output filter has its corner frequency at:
Operation with a higher corner frequency (e.g., L = 1 H, CO = 4.7 F) is possible. However, it is recommended
the loop stability be checked in detail. Selecting a larger output capacitor value (e.g., 22 F) is less critical
because the corner frequency moves to lower frequencies with fewer stability problems. The possible output filter
combinations are listed in Table 1.
Regardless of the inductance value, operation is recommended with 10-F output capacitor in applications with
Table 1. Output Filter Combinations
INDUCTANCE (L)
OUTPUT CAPACITANCE (CO)
1.0 H
≥ 4.7 F (ceramic capacitor)
2.2 H
≥ 2.2 F (ceramic capacitor)
The inductor value also has an impact on the pulse skipping operation. The transition into power-save mode
begins when the valley inductor current goes below a level set internally. Lower inductor values result in higher
ripple current which occurs at lower load currents. This results in a dip in efficiency at light load operations.
17
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