參數(shù)資料
型號(hào): PM6675S
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 3 A SWITCHING CONTROLLER, QCC24
封裝: 4 X 4 MM, LEAD FREE, VFQFPN-24
文件頁(yè)數(shù): 29/53頁(yè)
文件大?。?/td> 2632K
代理商: PM6675S
PM6675S
Device description
35/53
7.1.12
Device thermal protection
The internal control circuitry of the PM6675S self-monitors the junction temperature and
turns all outputs off when the 150 °C limit has been overrun. This event causes the switching
section to be immediately disabled and both switches to be opened. The controller performs
a soft-end and both the outputs are eventually kept to ground, then the low side MOSFET is
turned on when the voltage of the switching section is lower than 400 mV.
The thermal fault is a latched protection and, in normal operating conditions it is restored by
a Power-On Reset or toggling SWEN and LEN pins at the same time.
7.2
LDO linear regulator section
The independent Low-Drop-Out (LDO) linear regulator has been designed to sink and
source up to 2 A peak current and 1 A continuously. The LDO output voltage can be
adjusted in the range 0.6 V to 3.3 V simply connecting a resistor divider as shown in
.
Equation 23
Figure 44.
LDO output voltage selection
Table 9.
Switching section OV, UV and OT Faults management
Fault
Conditions
Action
Over voltage
VOUT > 115 % of the
nominal value
LGATE pin is forced high and the device latches off.
Exit by a Power-On Reset or toggling SWEN
Under voltage
VOUT < 70 % of the
nominal value
LGATE pin is forced high after the soft-end, then the
device latches off. Exit by a Power-On Reset or
toggling SWEN.
Junction over
temperature
TJ > +150 °C
LGATE pin is forced high after the soft-end, then the
device latches off. Exit by a Power-On Reset or
toggling SWEN and LEN after 15°C temperature
drop.
20
R
20
R
19
R
6
.
0
VLDOADJ
+
=
PM6675
LFB
LOUT
R19
R20
VLOUT
LGND
Cc
COUT
PM6675S
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