Datasheet

+
1
RC
TPS40210/11
150 mV
S Q
QR
+
+
8
5
VDD
GND
R
RC
C
RC
CLK
Frequency > Controller
Frequency
V
IN
Amplitude >
20
V
IN
Duty Cycle < 50%
UDG-08064
10
1
6
TPS40210/11
VDD
RC
GND
C
T
R
T
UDG-07119
10
8
7
VDD
ISNS
GDRV
GND
TPS40210/11
L
V
OUT
V
IN
6
R
ISNS
UDG-07120
C
IFLT
R
IFLT
TPS40210-Q1, TPS40211-Q1
SLVS861D –AUGUST 2008–REVISED APRIL 2010 www.ti.com
Figure 21. Diode Connected Synchronization
Current Sense and Overcurrent
The TPS40210 and TPS40211 are current-mode controllers and use a resistor in series with the source terminal
power FET to sense current for both the current-mode control and overcurrent protection. The device enters a
current-limit state if the voltage on the ISNS pin exceeds the current-limit threshold voltage V
ISNS(oc)
from the
electrical specifications table. When this happens, the controller discharges the SS capacitor through a relatively
high impedance and then attempts to restart. The amount of output current that causes this to happen is
dependent on several variables in the converter.
Figure 22. Oscillator Components Figure 23. Current Sense Components
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Product Folder Link(s): TPS40210-Q1 TPS40211-Q1