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PM6675 数据表(PDF) 29 Page - STMicroelectronics

部件名 PM6675
功能描述  Very fast load transient response using constant on-time control loop
PDF  47 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6675 数据表(HTML) 29 Page - STMicroelectronics

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6.1.12
Device thermal protection
The internal control circuitry of the PM6675 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 400mV.
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.
6.2
LDO Linear Regulator section
The independent Low-Drop-Out (LDO) linear regulator has been designed to sink and
source up to 2A peak current and 1A continuously. The LDO output voltage can be adjusted
in the range 0.6V to 3.3V simply connecting a resistor divider as shown in Figure 16.
Equation 23
Figure 16. LDO output voltage selection
Table 7. 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



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