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參數(shù)資料
| 型號(hào)： | PT6656Q |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PSMA14 |
| 封裝： | PLASTIC, SIP-14 |
| 文件頁(yè)數(shù)： | 14/19頁(yè) |
| 文件大?。?/td> | 548K |
| 代理商： | PT6656Q |
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Application Notes
For technical support and further information, visit http://power.ti.com
PT6650 Series
Table 1-1: Input/Output Capacitors
Notes:
[1]
N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
[2]
A fused input bus is recommended when tantalum capacitors are used on the output bus.
Capacitor Recommendations for the
PT6650 Regulator Series
Input Capacitor:
The required input capacitor is determined by 560 F
capacitance value, and a minimum ripple current rating of
1.2 Arms. The ripple current rating and less than 120 m
equivalent series resistance (ESR) are the major consid-
erations, along with operating temperature, when selecting
input capacitors.
Tantalum/Os-Con capacitors are not recommended due
to a minimum voltage rating of 2
× (the max. DC voltage
+ AC ripple). This is standard practice to ensure reliability.
Output Capacitors:
The ESR specification of the output capacitor should be
a minimum of 50 m
*. Electrolytic capacitors have
marginal ripple performance at frequencies greater than
400 kHz but excellent low frequency transient response.
Above the ripple frequency ceramic capacitors are
necessary to improve the transient response and reduce
any high-frequency noise components apparent during
higher current excursions. Electrolytic capacitors with
appropriate ESR values are identified in Table 1-1. In low-
temperature applications (<0 °C), a higher capacitance
with lower ESR will improve performance.
* Os-Con and ultra low ESR type capacitors are not recom-
mended on the output bus as they degrade regulator stability.
Tantalum Capacitors (For Vo <5.1 V)
Tantalum type capacitors can be used on the output bus for
output voltages less than 5.1 V. Voltages higher than this
will exceed the capacitor’s published surge voltage limits.
If tantalum capacitors are located on the output bus, an
appropriate fuse with I2t current derating is recommended
along with an external clamp component. An Output
Over-voltage Clamp (OOVC) will fault the output fuse
to protect the capacitors in event of an over-voltage con-
dition. The OOVC can be a simple zener high power
diode, 3 W to 5 W, located on the load side of the output
bus. The zener diode should be rated to 1.3 times the
normal output voltage.
Capacitor Table
Table 1-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple
current (rms) ratings. The number of capacitors required
at both the input and output buses is identified for each
capacitor type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(Equivalent Series Resistance at 100 kHz) are critical param-
eters necessary to insure both optimum regulator performance
and long capacitor life.
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<
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