Datasheet
PTV08T250W
SLTS260E – OCTOBER 2005 – REVISED NOVEMBER 2008 ..........................................................................................................................................
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ELECTRICAL CHARACTERISTICS (continued)
T
A
= 25 ° C, V
I
= 12 V, V
O
= 3.3 V, C
I
= 560 µ F, C
O
= 660 F, and I
O
= I
O
max (unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Capacitance Value Nonceramic 660
(7)
14,000
(8)
µ F
w/out TurboTrans Ceramic 3000
Equivalent series resistance (non-ceramic) 3
(9)
m Ω
C
O
External output capacitance
see TT 14,000
(11)
µ F
Capacitance Value
chart
(10)
w/ TurboTrans
Capacitance X ESR product (C
O
*ESR) 10,000
(12)
m Ω * µ F
2.7
MTBF Reliability Per Bellcore TR-332 50% stress, T
A
= 40 ° C, ground benigh
10
6
Hrs
(7) A minimum value of output capacitance is required for proper operation. Adding additional capacitance at the load further improves
transient response. See the Capacitor Application Information section for further guidance.
(8) This is the calculated maximum. This value includes both ceramic and non-ceramic capacitors. The minimum ESR requirement often
results in a lower value. For further information, see the related application section.
(9) This is the typical ESR for all the electrolytic (nonceramic) output capacitance. Use 5 m Ω as the minimum when using manufacturer ' s
max-ESR values to calculate.
(10) Minimum capacitance is determined by the transient deviation requirement. A corresponding resistor, R
TT
is required for proper
operation. See the TurboTrans Selection section for guidance in selecting the capacitance and R
TT
value
(11) This is the calculated maximum output capacitance. This value includes both ceramic and non-ceramic capacitors.
(12) When calculating the Capacitance X ESR product use the capacitance and ESR values of a single capacitor. For an output capacitor
bank of several capacitor types and values, calculate the C*ESR product using the values of the capacitor that makes up the majority of
the capacitance.
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