PTH08T255WAD datasheet(15/35 Pages) TI1

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PTH08T255W Type C Capacitors

C – Capacitance – mF

With TurboTrans

Without TurboTrans

(

)

(

)

4700

)

4700

(3)

PTH08T255W

www.ti.com ........................................................................................................................................................................................... SLTS290 – NOVEMBER 2008

12-V INPUT

Figure 8. Capacitor Type C,

5000 < C(

µF)×ESR(mΩ) ≤ 10,000(e.g. OS-CON)

Table 5. Type C TurboTrans CO Values and Required RTT Selection Table

Transient Voltage Deviation (mV)

12 Volt Input

25% load step

50% load step

75% load step

RTT

(10 A)

(20 A)

(30 A)

Minimum Required Output

Required TurboTrans

Capacitance (

µF)

Resistor (k

Ω)

130

195

1000

open

120

180

1050

280

100

150

1300

75.0

120

1700

31.6

2400

12.4

3000

6.49

3950

2.00

8000

short

RTT Resistor Selection

The TurboTrans resistor value, RTT can be determined from the TurboTrans programming Equation 3.

Where CO is the total output capacitance in µF. CO values greater than or equal to 4700 µF require RTT to be a

short,

Ω.

(Equation

results

negative

value

for

RTT

when

4700

µF).

To ensure stability, a minimum amount of output capacitance is required for a given RTT resistor value. The value

of RTT must be calculated using the minimum required output capacitance determined from Figure 8.

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