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參數(shù)資料
| 型號： | PM6652TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 35/53頁 |
| 文件大?。?/td> | 2519K |
| 代理商： | PM6652TR |
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Device description
PM6652
40/53
Doc ID 16867 Rev 3
Figure 42.
Valley current limit detection
if the overload is not removed, the output capacitor keeps discharging until the UV fault is
detected.
In order to set the right valley current limit threshold, the PM6652 internal parameters and
also external components accuracy must be considered.
A complete computation of the valley current limit threshold worst case variation can be
found in Equation 22.
Equation 22
The “key parameter” is the low-side MOSFET on resistance,
δR
DS,ON, which takes account
of the maximum on-resistance value and its thermal drift. The other parameters, with the
exception of RILIM (typical accuracy 1%), are all internal parameters: δIILIM<0.5 A is the
current reference variation and VOFFSET<4 mV is the current limit comparator offset.
8.10.7
SVCC undervoltage protection
The PM6652 can detect an SVCC under voltage (threshold 3.9 V typ.). When this fault
occurs, the high-side MOSFET is turned-off and the low-side MOSFET is turned-on. The
device is turned-on again if the SVCC voltage is higher than 4.4 V (typ.). This fault protection
is always active.
8.10.8
Thermal protection
If the device internal temperature is greater than 150 °C the thermal shutdown is performed.
The internal discharge MOSFET is turned-on until VOUT is lower than about 100 mV, then
the low-side MOSFET is turned-on.
A COREON or SVCC toggle is required to turn-on again the device. This fault detection is
masked during VID transitions and, during soft-start, until the power good signal is released.
δ
+
+
δ
+
δ
>
δ
ON
,
DS
ON
,
DS
ILIM
OFFSET
ILIIM
ILIM
VALL
,
L
WC
,
VALL
,
L
R
I
V
20
I
R
I
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| PM6670 | 制造商:STMicroelectronics 功能描述: |
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| PM6670ASTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6670ATR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6670S | 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl 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(fēng)格: 封裝 / 箱體:CPAK |
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