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參數(shù)資料
| 型號(hào)： | 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)： | 25/53頁 |
| 文件大?。?/td> | 2519K |
| 代理商： | PM6652TR |
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PM6652
Device description
Doc ID 16867 Rev 3
31/53
very high efficiency at light load. Figure 8 on page 20 and Figure 11 on page 21 show the
inductor current waveform when the DPRSLPVR pin is asserted high or low.
When the DPRSLPVR control pin is still asserted high and the VDAC ramp-up transition is
requested, the render suspend fast exit is performed, by increasing VDAC output with a
minimum voltage slew-rate of 10 mV//s (Figure 26 on page 30).
If the DPRSLPVR signal is de-asserted before any VIDs change, the VDAC ramp-up
transition is performed with a minimum voltage slew-rate of 5 mV/s (render suspend slow
exit).
In CPU IMVP6.5 and VR11 mode the minimum voltage slew-rate is fixed, as reported in
, and the DPRSLPVR control signal, when asserted high, directly
activate the pulse-skipping algorithm for higher light load efficiency.
8.7
Current sensing
As reported in Equation 9 the voltage sensed between CSNS and VOUT pins must be
proportional to the output current. Two main techniques can be used: the precision RSNS
resistor and the inductor's DCR current sensing (Figure 29 on page 31 and Figure 30 on
). The first method is more precise and more expensive, since a dedicated precision
component must be selected; on the other side, the inductor's current sensing technique is
cheaper but it's based on the parasitic inductor resistance whose accuracy is hardly lower
than 10%. An RS-CS filter matched with the inductor's time constant is also required. If the
inductor's DCR value is greater than the required DROOP an additional RB resistor is
necessary. In this case, the sensed current as suggested by Equation 9 becomes:
Equation 9
Figure 29.
Precision resistor current sensing
Figure 30.
Inductor's DCR current sensing
A
B
A
DCR
LOAD
DCR
A
B
OUT
SNS
C
R
//
R
s
1
R
sL
1
I
R
V
C
=
τ
+
+
=
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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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