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TPS62133A-Q1 Datasheet(PDF) 10 Page - Texas Instruments

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Part # TPS62133A-Q1
Description  TPS6213xA-Q1 3-V to 17-V 3-A Step-Down Converter with DCS-Control
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62133A-Q1 Datasheet(HTML) 10 Page - Texas Instruments

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background image
ns
V
V
t
IN
OUT
ON
400
×
=
control logic
Soft
start
Thermal
Shtdwn
UVLO
PG control
power
control
error
amplifier
gate
drive
HS lim
LS lim
PVIN
PVIN
AVIN
PG
PGND
PGND
AGND
comp
comp
+
_
timer tON
DCS - Control
TM
direct control
&
compensation
comparator
ramp
SW
SW
SW
EN
*
SS/TR
DEF
*
LOG
VOS
FB
*
* This pin is connected to a pull down resistor internally
(see Detailed Description section).
TPS62130A-Q1, TPS62133A-Q1
SLVSCC2 – MAY 2014
www.ti.com
Functional Block Diagram (continued)
Figure 17. TPS62133A-Q1 (5V Fixed Output Voltage)
10.3 Feature Description
10.3.1 Pulse Width Modulation (PWM) Operation
The TPS6213xA-Q1 operates with pulse width modulation in continuous conduction mode (CCM) with a nominal
switching frequency of 2.5 MHz. The frequency variation in PWM is controlled and depends on VIN, VOUT and the
inductance. The device operates in PWM mode as long the output current is higher than half the inductor's ripple
current. To maintain high efficiency at light loads, the device enters Power Save Mode at the boundary to
discontinuous conduction mode (DCM). PSM operation occurs if the output current becomes smaller than half
the inductor's ripple current.
10.3.2 Power Save Mode Operation
The built in Power Save Mode of the TPS6213xA-Q1 is entered seamlessly, if the load current decreases. This
secures a high efficiency in light load operation. The device remains in Power Save Mode as long as the inductor
current is discontinuous.
In Power Save Mode, the switching frequency decreases linearly with the load current maintaining high
efficiency. The transition into and out of Power Save Mode happens within the entire regulation scheme and is
seamless in both directions.
TPS6213xA-Q1 includes a fixed on-time circuitry. This on-time, in steady-state operation, can be estimated as:
(1)
10
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Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: TPS62130A-Q1 TPS62133A-Q1


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