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(yè)數(shù)： 26/53頁(yè)
文件大小： 2519K
代理商： PM6652TR
Device description
PM6652
32/53
Doc ID 16867 Rev 3
The previous equation also shows the frequency dependence of the DCR current sensing
technique. During load variation the sensed DCR can also increase, if the time constant
matching is not adequate; in order to avoid this situation the following equation must be
verified:
Equation 10
shows the VCORE load transient response when Equation 10 is not verified
whereas in Figure 32 the load transient response shows a better time constant matching.
If a thermal compensation is required in order to compensate for the inductor's DCR
variation, due to temperature increase, RB is replaced by a complete network, based on a
NTC (negative temperature coefficient) thermistor (Rn). Figure 33 shows an example of
NTC-based thermal compensation network (Rs, Rp and Rn). The resultant RB1 equivalent
resistance and NTC network attenuation are:
Equation 11
and the time constant due to CA capacitor can be computed as follows:
Equation 12
In PM6652 the CSNS and VOUT inputs are high-impedance pins so a very small leakage
current can be measured, in the range of 50 nA to 100 nA. This leakage current, sourced by
CSNS, is multiplied by the equivalent resistance measured across CA capacitor, i.e.
L
DCR
A
R
L
τ
=
≥
τ
Figure 31.
τ
L > τC
Figure 32.
τ
L < τC
( )
A
1
B
1
B
NTC
N
P
S
1
B
R
G
T
R
//
R
)
T
(
R
+
=
+
=
(
)
1
B
A
R
//
R
C
=
τ
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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
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