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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)： | 33/53頁 |
| 文件大小： | 2519K |
| 代理商： | PM6652TR |
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PM6652
Device description
Doc ID 16867 Rev 3
39/53
8.10.6
Overcurrent protection
The PM6652 controller can limit the maximum load current by skipping one or more
switching cycles if the valley current limit is detected. The current limit sensing is
independent from the current sensing for droop and IMON functions. Basically, the voltage
drop sensed between PGND and PHASE pins, when the low side MOSFET is on, is
compared with the voltage across the external RILIM resistor. The following equation helps to
program the valley current limit value (see Figure 41):
Equation 20
Figure 41.
Valley current limit circuitry
The maximum programmable voltage on pin ILIM is 3.5 V (typ.); as a consequence the
maximum effective RILIM resistor is about 700 k
Ω.
If, starting from the previous equation, an higher resistance is required the resultant low side
MOSFET on-resistance is not adequate for the designed application.
The maximum available load current, with the valley current limit technique, is equal to:
Equation 21
i.e. the maximum available current is the sum of the valley current limit value plus the half of
the inductor current ripple. The valley current limit is sensed each switching cycle, during
TOFF time (when the low-side MOSFET is turned-on). This fault protection is not latched but
the typical behavior is the one shown in Figure 42 on page 40:
(
)
PHASE
PGND
ILIM
V
20
A
5
R
=
μ
L
2
1
VCL
MAX
,
LOAD
I
Δ
+
=
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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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