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參數(shù)資料
| 型號： | TPS51427RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 7/41頁 |
| 文件大?。?/td> | 2040K |
| 代理商： | TPS51427RHBR |
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LDO
( )
LDO min
LDO
5 V
C
4.7 F
V
=
m
(2)
CURRENT SENSING AND OVERCURRENT PROTECTION
(
)
f
VIN
VOUT
RIPPLE
OCP
TRIP
VIN
V
I
1
I
2
L
V
-
=
+
=
+
÷
÷
÷
÷
è
è
è
(3)
www.ti.com................................................................................................................................................ SLUS819B – APRIL 2008 – REVISED SEPTEMBER 2008
When the LDOREFIN pin is connected to GND, the TPS51427 internal linear regulator produces a fixed 5-V LDO
output; when LDOREFIN is connected to V5FILT, the linear regulator produces a fixed 3.3-V LDO output. The
LDO regulator can supply up to 100 mA for external loads. Bypass the LDO with a minimum 4.7-
F ceramic
capacitor. When the LDO is fixed at 5 V, and VSW voltage is equal to or greater than 4.7 V, the 5 V LDO
switches off after a 3.8-ms delay, and the 5V rail is bootstrapped to the VSW output, thereby improving the
efficiency of the converter. A glitch-free switchover is also accomplished. The switchover impedance from the
VSW pin to the LDO pin is typically 0.7
. In the same way, when the LDO is fixed at 3.3-V and the VSW voltage
is equal to or greater than 3.15 V, the 3.3-V LDO switches off after a delay of 4 ms, and the 3.3-V rail is
bootstrapped to the VSW output.
In adjustable mode, the LDO output can be set from 0.7 V to 4.5 V. The LDO output voltage is equal to two times
the LDOREFIN voltage. There is no switchover action in adjustable mode.
For the 5-V LDO output, a 4.7-
F ceramic capacitor (minimum) is required from the LDO to GND. For the 3.3-V
LDO output, a 10-
F ceramic capacitor (minimum) is required from the LDO to GND. If a lower voltage LDO
output is desired, scale the output capacitance of the LDO according to Equation 2.
For example, if VLDO = 1 V, CLDO(min) = 23.5 F. Use the standard capacitance value to choose 27 F for the 1-V
LDO output.
In order to provide the most cost-effective solution, the TPS51427 supports low-side MOSFET RDS(on) sensing for
overcurrent protection. In any setting, the output signal of the current amplifier becomes 100 mV at the
overcurrent limit (OCL) set point. This configuration means that the current sensing amplifier normalizes the
current information signal based on the OCL setting.
The TPS51427 supports cycle-by-cycle OCL control. The controller does not allow the next ON cycle while the
current level is above the trip threshold. The overcurrent trip threshold voltage is determined by the TRIPx pin as
Table 3 shows. The TRIPx terminal sources 5-
A current with a 2900ppm/°C temperature slope, with respect to
its +25°C value, to compensate the temperature dependency of the MOS RDS(on). The trip level is set to the
voltage across RTRIPx when TRIPx is between 200 mV and 2 V at room temperature. When the TRIPx pin is tied
to 5 V directly, the controller defaults to 100 mV fixed OCL setting. With this option, temperature compensation is
not obtained.
Table 3. Overcurrent Trip Threshold Voltage
TRIPx
0.2 V to 2 V
5 V
OCL threshold in RDS(on) sensing
20 mV to 200 mV
100 mV
Temperature Coefficient (ppm/°C)
2900
None
The overcurrent condition is detected during the OFF state; therefore, ITRIP sets the valley level of the inductor
Copyright 2008, Texas Instruments Incorporated
15
Product Folder Link(s): TPS51427
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