TPS40210-Q1 Datasheet, PDF (14/41 Pages) Texas Instruments – 4.5-V TO 52-V INPUT, CURRENT-MODE BOOST CONTROLLERS

TPS40210-Q1, TPS40211-Q1
SLVS861D – AUGUST 2008 – REVISED APRIL 2010
www.ti.com
Amplitude > ^VIN
V_IN
20
Duty Cycle < 50%
Frequency > Controller
Frequency
VDD
8
R_RC
RC
1
C_RC
GND
5
+
+
+ _{150 mV}
Figure 21. Diode Connected Synchronization
CLK
SQ
RQ
TPS40210/11
UDG-08064
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.
TPS40210/11
10 VDD
R_T
1 RC
V
IN
TPS40210/11
VDD 10
L
V_OUT
C_T
6 GND
UDG-07119
GDRV 8
ISNS 7
GND ⁶
R_IFLT
C
IFLT
R_ISNS
Figure 22. Oscillator Components
UDG-07120
Figure 23. Current Sense Components
14
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