參數(shù)資料
型號(hào)： TPS54362QPWPRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 8 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20
封裝： GREEN, PLASTIC, HTSSOP-20
文件頁(yè)數(shù)： 9/34頁(yè)
文件大?。?/td> 826K
代理商： TPS54362QPWPRQ1
VReg
RST _TH
OV _TH
R1
R2
R3
C9
C10
C4
www.ti.com
SLVS845C – MARCH 2009 – REVISED MAY 2010
RESET THRESHOLD (RST_TH)
This pin is programmable for setting the output accuracy for the low power mode (LPM) to set the undervoltage
monitoring of the regulated output voltage (VReg_UV), and the voltage to initiate a rest output signal
(VReg_RST). The resistor combination of R1 to R3 is used to program the threshold for detection of
undervoltage. Voltage bias on R2 + R3 sets the Reset threshold.
Undervoltage for transient and Low Power Mode Operation:
VReg_UV = 0.82V × (R1 + R2 +R3 / (R2 + R3)
(6)
Reset Threshold = VReg_RST = 0.8V × (R1 + R2 + R3 / (R2 + R3)
(7)
Recommended range: 70% to 92% of the regulation voltage.
OVERVOLTAGE SUPERVISOR for VReg (OV_TH)
This pin is programmable to set the overvoltage monitoring of the regulated output voltage. The resistor
combination of R1 to R3 is used to program the threshold for detection of overvoltage. The bias voltage of R3
sets the OV threshold and the output voltage accuracy in hysteretic mode during transient events.
Overvoltage ref = VReg _OV = 0.8V x (R1 +R2 + R3) / (R3),
(8)
Recommended range: 106% to 110% of the regulation voltage
NOISE FILTER ON RST_TH AND OV_TH TERMINALS
There is some noise sensitivity on the RST_TH and OV_TH pins and capacitance is added to filter this noise.
The noise is more pronounced with fast falling edges on the PH pin. So the smaller the Rslew resistor (minimum
recommended value is 10k
) the more capacitance may be required on RST_TH and OV_TH. Users should use
the smallest capacitance necessary, because larger values will increase the loop response time and degrade
short circuit protection and transient response. The upper limit is determined by the 2ms maximum time constant
seen on the OVTH/RSTTH when VReg = 0 V (i.e. [R2 + R3]×[C9 + C10] < 2ms). The noise in the RST_TH /
OV_TH resistor chain may change with PCB layout or application set-up, so the RST_TH and/or the OVTH
capacitor may not be needed in all applications. Users can place the footprint and only populate it, if necessary.
Example
R1 = 36K
R2 = 600
R3 = 6.6k
VReg_RST = 0.8 × (43.2k) /7.2k) = 4.8V
VReg_OV = 0.8 × (43.2k) /6.6k) = 5.24V
Typical cap values for RST_TH/OV_TH caps are between 10 pf to 100 pf range for total resistance on
RSTH/OVTH divider of < 200 k
.
Copyright 2009–2010, Texas Instruments Incorporated
17
Product Folder Link(s) :TPS54362-Q1
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