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參數(shù)資料
| 型號： | PM6680ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 18/48頁 |
| 文件大?。?/td> | 1932K |
| 代理商： | PM6680ATR |
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PM6680A
Device description
25/48
Being fixed the valley threshold, the greater the current ripple is, greater the DC output
current is The valley current limit can be set with resistor RCSENSE:
Equation 7
Where ICSENSE = 100 A, RDSon is the drain-source on resistance of the low side switch.
Consider the temperature effect and the worst case value in RDSon calculation.
The accuracy of the valley current threshold detection depends on the offset of the internal
comparator (
V
OFF) and on the accuracy of the current generator (ICSENSE)
Equation 8
Where RSNS is the sensing element(RDSon)
PM6680A provides also a fixed negative peak current limit to prevent an excessive reverse
inductor current when the switching section sinks current from the load in PWM mode. This
negative current limit threshold is measured between PHASE and SGND pins, comparing
the magnitude drop on the PHASE node during the conduction time of the low side
MOSFET with an internal fixed voltage of 120 mV.
The negative valley-current limit INEG (if the device works in PWM mode) is given by:
Equation 9
7.7
Soft start and soft end
Each switching section is enabled separately by asserting high EN1/EN2 pins respectively.
In order to realize the soft start, at the startup the overcurrent threshold is set 25 % of the
nominal value and the undervoltage protection (see related sections) is disabled. The
controller starts charging the output capacitor working in current limit. The overcurrent
threshold is increased from 25 % to 100 % of the nominal value with steps of 25 % every
700 s (typ.). After 2.8 ms (typ.) the undervoltage protection is enabled. The soft start time is
not programmable. A minimum capacitor CINT is required to ensure a soft start without any
overshoot on the output:
Equation 10
R
CSENSE
R
DS on
()
I
Lvalley
×
Icsense
---------------------------------------------
=
SNS
CSENSE
OFF
CSENSE
Lvalley
R
R
V
I
+
+
×
+
=
100
DSon
NEG
R
mV
I
120
=
out
L
Lvalley
INT
C
2
I
4
I
A
6
C
×
+
≥
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| PM6681A | 功能描述:DC/DC 開關(guān)控制器 Dual Synch CTRLR Adj Voltage LDO RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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| PM6681ATR | 功能描述:DC/DC 開關(guān)控制器 DUAL STEP-DOWN CONTROLLER W/ADJ LDO RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| PM6685 | 功能描述:DC/DC 開關(guān)控制器 Dual Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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