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參數(shù)資料
| 型號： | TPS54362QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 7/34頁 |
| 文件大小： | 826K |
| 代理商： | TPS54362QPWPRQ1 |
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-6
O
-6
LOAD
C
1.55 × Css
30 × 10
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×
D × I
L
50 × 10
www.ti.com
SLVS845C – MARCH 2009 – REVISED MAY 2010
SOFT START (SS)
On powerup or after a short circuit event , the following conditions are recommended:
1. VIN – VReg > 2.5V
2. Load current < 1A, until RST goes high.
3. In discontinuous mode or LPM (i.e., light loads), in addition to 1), Vreg < 5.5V also applies.
4. Equation 4 should be satisfied. This condition also applies when there is a short circuit on the output.
(4)
Where:
D = VO/VIN duty cycle.
(5)
Css = 1 nF to 100 nF, providing the above equations are satisfied.
L is inductance of inductor.
LOW POWER MODE (LPM)
The TPS54362 enters automatically low power mode once the regulation goes into discontinuous mode. The
internal control circuitry for any transition from Low Power Mode to High Power Mode occurs within 5ms (typ). In
low power mode, the converter operates as a hysteretic controller with the threshold limits set by VReg_UV =
0.82 x (R1 + R2 +R3 / (R2 + R3), for the lower limit and ~VReg for the upper limit. To ensure tight regulation in
the low power mode, R2 and R3 values are set accordingly.
The device operates with both automatic and digital controlled low power mode. The digital low power mode can
over-ride the automatic low power mode function by applying the appropriate signal on the LPM terminal. The
part goes into active or normal mode for at least 100ms, whenever RST_TH or VREG_UV is tripped. In active
mode or normal mode, ALL blocks including OV function are enabled.
In LPM mode, OV function is disabled.
Active or Normal Mode: When part is in DCM with LPM=High or in CCM with LPM=High or Low
LPM: When part is in DCM with LPM = Low
Automatic and Digital
LPM high:
device forced normal mode, fixed frequency, even at light load current (part will do
pulse skipping to keep output voltage in regulation at light loads)
LPM low or open:
device will automatically change between normal and low power mode dependent on
load current
BUCK MODE LOW POWER MODE OPERATION
When operating in low power mode (Buck reg), and if the output is shorted to ground, a reset is asserted. The
thermal shutdown and current limiting circuitry is activated to protect the device.
The low power mode operation is initiated once the converter enters discontinuous mode of operation.
EXTERNAL LPM OPERATION
The low power mode (LPM) is active low, if there is an open on this terminal the IC enters the low power mode
(internal pull down).
To allow low power mode operation, the load current has to be low and the LPM terminal is set to ground.
To inhibit low power mode, the microcontroller has to drive the terminal high, and the converter is not in
discontinuous mode of operation.
Part can ONLY power-up in LPM/DCM if, VReg < 5.5V AND VIN-VReg > 2.5V.
In active mode. the part powers-up when VIN > 3.6V (min).
Copyright 2009–2010, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS54362-Q1
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