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參數(shù)資料
| 型號(hào)： | PM6686 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 26/50頁 |
| 文件大小： | 1066K |
| 代理商： | PM6686 |
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Device description
PM6686
32/50
Doc ID 15281 Rev 4
Figure 52.
Current limit circuit block diagram
A negative current control is also implemented: the low-side MOSFET is forced off when the
current exceeds the negative limit. This function prevents the excessive negative inductor
current during the PWM operating mode. The threshold is set approximately at the 120% of
the positive current limit.
8.1.8
Soft-start and soft-end
The two sections have independent enable pins, EN1 and EN2. A not programmable soft-
start procedure takes place when EN pin rises above 2.4 V typ.
To prevent high input inrush currents, the current limit is increased from 25% to 100% with
steps of 25%.
The procedure is not programmable and ends typically in 2.8 ms. The overvoltage protection
is always active while the undervoltage protection is enabled typically 20 ms after the
beginning of the soft-start procedure.
Driving one EN pin below 0.8 V makes the section perform a soft-end: gate driving signals
are pulled low and the output is discharged through an internal MOSFET with RDS(on) of
28
Ω typ.
A power up sequence for the switching sections can be selected connecting one EN pin to
VREF2.
Table 10.
Current limit configuration
Control pin
Control pin voltage
Threshold SET
ILIM1
ILIM2
VILIM = VCC-1 V
100 mV
0.2 V = VILIM = 2 V
VILIM = 5A * RILIM
VILIM/10
PHASE
ILIM
+
-
+-
Ton
Generator
9R
R
LGATE
HGATE
5uA
RILIM
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