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參數資料
| 型號： | TPS65820RSHTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數： | 58/98頁 |
| 文件大小： | 2290K |
| 代理商： | TPS65820RSHTG4 |
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Soft Start
Dropout Operation at 100% Duty Cycle
V(VIN_SM1) v V(SM1) ) I(L1) RDSON(PSM1) ) RL
(7)
Output Voltage Monitoring
Standby Mode
PWM Operation
www.ti.com .............................................................................................................................................................. SLVS663B – MAY 2006 – REVISED APRIL 2008
SM1 and SM2 have an internal soft start circuit that limits the inrush current during start-up. An initial delay (170
s typ) from the converter enabled command to the converter effectively being operational is required, to assure
that the internal circuits of the converter are properly biased. At the end of that initial delay the soft start is
initiated, and the internal compensation capacitor is charged with a low value current source. The soft start time
is typically 750
s, with the output voltage ramping from 5% to 95% of the final target value.
The TPS65820 buck converters offer a low input to output voltage difference while still maintaining operation
when the duty cycle is set to 100%. In this mode of operation the P-channel switch is constantly turned on,
enabling operation with a low input voltage. The dropout operation starts if:
Where:
I(L1) = Output current plus inductor ripple current.
RL = DC resistance of the inductor
Equation 7 can be also used for the SM2 converter, replacing SM1 by SM2 and L1 by L2.
The output voltage of converters SM1 and SM2 is monitored by internal comparators, and an output low voltage
condition is detected when the output voltage is below 90% of the programmed value. The power good status for
SM1 and SM2 is accessible via I2C, see interrupt controller section for more details.
The power good comparators for SM1 and SM2 are disabled during the transition to standby mode operation.
They are enabled when the transition to standby mode is complete.
Using the I2C SM1 and SM2 can be set in stand-by mode. In STANDBY mode the PFM operation mode is set
and the output voltage is defined by I2C registers SM1_STANDBYand SM2_STANDBY, and it can be set to a
value different than the normal mode output regulation voltage. The standby mode can also be set by the GPIO
pins, if those are configured as control pins that define the SM1/SM2 operating mode.
During PWM operation the converters use a fast response voltage mode controller scheme with input voltage
feed-forward, enabling the use of small ceramic input and output capacitors. At the beginning of each clock cycle
the P-channel MOSFET switch is turned on, and the oscillator starts the voltage ramp. The inductor current
ramps up until the ramp voltage reaches the error amplifier output voltage, when the comparator trips and the
p-channel MOSFET switch is turned off. Internal adaptative break-before-make circuits turn on the integrated
n-channel MOSFET switch after an internal, fixed dead-time delay, and the inductor current ramps down, until
the next cycle is started. When the next cycle starts the ramp voltage is reset to its low value and the p-channel
MOSFET switch is turned on again.
Copyright 2006–2008, Texas Instruments Incorporated
61
Product Folder Link(s): TPS65820
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| TPS65835RKPT | 功能描述:PMIC 解決方案 ADVANCED PMU RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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