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參數資料
| 型號： | PM6675ASTR |
| 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 |
| 文件頁數： | 25/48頁 |
| 文件大小： | 2481K |
| 代理商： | PM6675ASTR |
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PM6675AS
Device description
31/48
The Under-Voltage Protection circuit is enabled only at the end of the soft-start. Once an
UVP has taken part, a toggle on SWEN pin or a Power-On-Reset is necessary to clear the
fault state and restart the section.
7.1.12
Device thermal protection
The internal control circuitry of the PM6675AS self-monitors the junction temperature and
turns all outputs off when the 150 °C limit has been overran. 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 normal operating condition 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
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 temperature drop.
20
R
20
R
19
R
6
.
0
VLDOADJ
+
=
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