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XR76203ELTR-F Datasheet(PDF) 14 Page - Exar Corporation

Part No. XR76203ELTR-F
Description  3A/5A/8A Synchronous Step Down COT Regulator
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR76203ELTR-F Datasheet(HTML) 14 Page - Exar Corporation

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Rev 1A
Programming the On-Time
The On-Time TON is programmed via resistor RON accord-
ing to following equation:
where TON is calculated from:
where:
f is the desired switching frequency at nominal IOUT
Eff is the Regulator efficiency corresponding to nominal
IOUT shown in figures 19-24
Substituting for TON in the first equation we get:
Over-Current Protection (OCP)
If load current exceeds the programmed over-current, IOCP,
for four consecutive switching cycles, the Module enters
hiccup mode of operation. In hiccup, the MOSFET gates
are turned off for 110ms (hiccup timeout). Following the hic-
cup timeout, a soft-start is attempted. If OCP persists, hic-
cup timeout will repeat. The Module will remain in hiccup
mode until load current is reduced below the programmed
IOCP . In order to program the over-current protection, use
the following equation:
Where:
RLIM is resistor value for programming IOCP
IOCP is the over-current threshold to be programmed
RDS
is
the
MOSFET
rated
On
Resistance;
XR76208=21.5mΩ, XR76205=59mΩ, XR76203=59mΩ
8mV is the OCP comparator maximum offset
ILIM is the internal current that generates the necessary
OCP comparator threshold (use 45μA).
Note that ILIM has a positive temperature coefficient of
0.4%/°C (figure 10). This is meant to roughly match and
compensate for positive temperature coefficient of the syn-
chronous FET. Graph of typical IOCP versus RLIM is shown
in figure 7-9. Maximum allowable RLIM for XR76205 is
8.06kΩ.
Short-Circuit Protection (SCP)
If the output voltage drops below 60% of its programmed
value, the Module will enter hiccup mode. Hiccup will per-
sist until short-circuit is removed. SCP circuit becomes
active after PGOOD asserts high.
Over-Temperature (OTP)
OTP triggers at a nominal die temperature of 150°C. The
gate of switching FET and synchronous FET are turned off.
When die temperature cools down to 135°C, soft-start is ini-
tiated and operation resumes.
Programming the Output Voltage
Use an external voltage divider as shown in the Application
Circuit to program the output voltage VOUT.
where R2 has a nominal value of 2kΩ.
Programming the Soft-start
Place a capacitor CSS between the SS and AGND pins to
program the soft-start. In order to program a soft-start time
of TSS, calculate the required capacitance CSS from the
following equation:
R
ON
VIN
TON 25
9
10


3.05
10
10
------------------------------------------------------------
=
T
ON
VOUT
VIN fEff
------------------------------
=
R
ON
VOUT
fEff
---------------


25
9
10
 V
IN

3.05
10
10
-------------------------------------------------------------------------
=
RLIM
IOCP
RDS
 8mV
+
ILIM
------------------------------------------------------
=
R1
R2
VOUT
0.6
-------------
1


=
CSS
TSS
10A
0.6V
--------------


=


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