參數(shù)資料
型號(hào)： TPS53314RGFR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1070 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 5 X 7 MM, GREEN, PLASTIC, VQFN-40
文件頁(yè)數(shù)： 15/29頁(yè)
文件大?。?/td> 800K
代理商： TPS53314RGFR
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(
)
(
)
-
=
+
=
+
IND(ripple)
IN
OUT
TRIP
OCP
SW
IN
DS(on)
I
V
1
I
2
L
f
V
8
R
8
R
SLUSAK3
– MAY 2011
The inductor current is monitored by the voltage between the GND pin and the SW pin so that the SW pin should
be connected to the drain terminal of the low-side MOSFET properly. ITRIP has 4700 ppm/°C temperature slope
to compensate the temperature dependency of the RDS(on). The GND pin is used as the positive current sensing
node. The GND pin should be connected to the proper current sensing device, (for example, the source terminal
of the low-side MOSFET.)
As the comparison is done during the OFF state, VTRIP sets the valley level of the inductor current. Thus, the load
current at the overcurrent threshold, IOCP, can be calculated as shown in Equation 5.
(5)
In an overcurrent condition, the current to the load exceeds the current to the output capacitor, therefore the
output voltage tends to decrease. Eventually, it crosses the undervoltage protection threshold and shuts down.
After a hiccup delay (16 ms with 0.7-ms sort-start), the controller restarts. If the overcurrent condition remains,
the procedure is repeated and the device enters hiccup mode.
During CCM, the negative current limit (NCL) protects the internal FET from carrying too much current. The NCL
detect threshold is set as the same absolute value as positive OCL but negative polarity. Note that the threshold
continues to represent the valley value of the inductor current.
Overvoltage and Undervoltage Protection
The TPS53314 monitors a resistor divided feedback voltage to detect overvoltage and undervoltage. When the
feedback voltage becomes lower than 70% of the target voltage, the UVP comparator output goes high and an
internal UVP delay counter begins counting. After 1 ms, TPS53314 latches OFF both high-side and low-side
MOSFETs drivers. The controller restarts after a hiccup delay (16 ms with 0.7-ms soft-start). This function is
enabled 1.5 ms after the soft-start is completed.
When the feedback voltage becomes higher than 120% of the target voltage, the OVP comparator output goes
high and the circuit latches OFF the high-side MOSFET driver and latches ON the low-side MOSFET driver. The
output voltage decreases. If the output voltage reaches the UV threshold, then both high-side MOSFET and
low-side MOSFET driver is OFF and the device restarts after a hiccup delay. If the OV condition remains, both
high-side MOSFET and low-side MOSFET driver remains OFF until the OV condition is removed.
UVLO Protection
The TPS53314 uses VREG undervoltage lockout protection (UVLO). When the VREG voltage is lower than the
UVLO threshold voltage, the switch mode power supply shuts off. This is a non-latch protection.
Thermal Shutdown
TPS53314 includes a temperature monitoring feature. If the temperature exceeds the threshold value (typically
145
°C), TPS53314 shuts off. When the temperature falls approximately 10°C below the threshold value, the
device turns on again. This is a non-latch protection.
22
Copyright
2011, Texas Instruments Incorporated
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