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UP9512 Datasheet(PDF) 13 Page - uPI Group Inc.

Part # UP9512
Description  8/7/6/5/4/3/2/1-Phase Synchronous-Rectified Buck Controller with SMBus Digital Interface
PDF  31 Pages
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Manufacturer  UPI [uPI Group Inc.]
Direct Link  http://www.ubiq-semi.com/
Logo UPI - uPI Group Inc.

UP9512 Datasheet(HTML) 13 Page - uPI Group Inc.

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uP9512
13
uP9512-DS-F0001, Dec. 2018
www.upi-semi.com
Functional Description
Channel Current Limit (CH_OC)
The uP9512 adopts channel peak current limit function to
avoid catastrophic damage to power stage components.
The uP9512 monitors the sensed current (in the form of
voltage) from DrMOS. If the sensed voltage of any phase
exceeds the channel current limit threshold, the channel
current limit function activates. The resistor R
CH_OC
connected between CH_OC pin and GND determines the
channel current limit threshold. The channel current limit
threshold can be calculated as:
CS
OC
CH
PEAK
OUT
G
uA
R
I
×
×
=
6
20
_
)
(
Where I
OUT(PEAK) is the per-phase inductor peak current,
R
CH_OC is the resistor connected between CH_OC pin and
GND. The R
CH_OC must be at least 10kΩ. GCS (mV/A) is the
current sense gain of DrMOS. Once the per-phase current
exceeds the setting threshold, the per-phase output
inductor current is limited to an average current. A
continuous over load event will cause the output voltage
drop and eventually trigger under voltage protection and
shuts down the uP9512.
Total Output Current Protection
ISUM
IMON
RIMON
2.1V
CMP
Total
OCP
CIMON
Figure 12. Total Output Current Protection
The uP9512 provides total OCP as shown in Figure 12. A
resistor R
IMON is connected from IMON pin to GND. Adding
a capacitor to the IMON pin can adjust the IMON response
time. The sensed current I
SUM is mirrored internally and fed
to IMON pin. This current flows through the resistor R
IMON
creating voltage across it. As the total load current
increases, the voltage on IMON pin (V
IMON) increases
proportionally. When the IMON pin voltage is greater than
2.1V, the total OCP will be triggered. The total OCP level
(2.1V) is usually designed for the voltage regulator that is
operated in full phase condition by hardware setting. The
actual operating phase number is controlled by the PSI
signal or the SMBus Auto Phase setting. When the
operating phase number is decreased, the total OCP level
is decreased as well. The total OCP level is changed per
actual operating phase number. Table 7 shows the
relationship between total OCP ratio per actual operating
phase number and the hardware configuration.
Once the total OCP is triggered. The uP9512 will turn off
both high-side and low-side MOSFETs of all channels. The
total OCP function is a latch-off function and only EN restart
or 5VCC re-POR can release the latch.
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-1
Table 7. Total OCP and Operating Phase Number



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