參數(shù)資料
型號(hào): TPS65257RHAT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40
封裝: 6 X 6 MM, GREEN, PLASTIC, VQFN-40
文件頁數(shù): 16/34頁
文件大?。?/td> 2100K
代理商: TPS65257RHAT
1
267
( )
1.77
1(
)
LIM
I
A
RLIM
k
=
+
W
100
175
250
325
400
475
550
625
700
775
850
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RLIM1 - kW
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1.3
1.5
1.8
2
2.3
2.5
2.8
3
3.3
3.5
3.8
4
4.3
4.5
I_PEAK
2
256
( )
1.72
1(
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LIM
I
A
RLIM
k
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W
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1.3
1.5
1.8
2
2.3
2.5
2.8
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3.3
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4.3
4.5
I_PEAK
100
175
250
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475
550
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775
850
925
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RLIM2 - kW
3
253
( )
0.97
2(
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LIM
I
A
RLIM
k
=
+
W
100
175
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400
475
550
625
700
775
850
925
1000
RLIM3 - kW
I_PEAK
0.5
0.8
1
1.3
1.5
1.8
2
2.3
2.5
2.8
3
3.3
3.5
SLVSB32
– SEPTEMBER 2011
TYPE II CIRCUIT
(9)
(10)
(11)
All converters operate in hiccup mode: Once an over-current lasting more than 10 ms is sensed in any of the
converters, they will shut down for 10 ms and then the start-up sequencing will be tried again. If the overload has
been removed, the converter will ramp up and operate normally. If this is not the case the converter will see
another over-current event and shuts-down again repeating the cycle (hiccup) until the failure is cleared.
If an overload condition lasts for less than 10 ms, only the relevant converter affected will shut-down and re-start
and no global hiccup mode will occur.
Overvoltage Transient Protection
The device incorporates an overvoltage transient protection (OVP) circuit to minimize voltage overshoot. The
OVP feature minimizes the output overshoot by implementing a circuit to compare the FB pin voltage to OVTP
threshold which is 109% of the internal voltage reference. If the FB pin voltage is greater than the OVTP
threshold, the high side MOSFET is disabled preventing current from flowing to the output and minimizing output
overshoot. When the FB voltage drops lower than the OVTP threshold which is 107%, the high side MOSFET is
allowed to turn on the next clock cycle.
Copyright
2011, Texas Instruments Incorporated
23
Product Folder Link(s): TPS65257
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