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TPS62000DGSR Datasheet(PDF) 9 Page - Texas Instruments

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No. de Pieza. TPS62000DGSR
Descripción  TPS6200x High-Efficiency Step-Down Low Power DC-DC Converter
Descarga  31 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62000DGSR Datasheet(HTML) 9 Page - Texas Instruments

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PFM/PWM
Control Logic
Current Limit
Logic
_
+
Compensation
Soft
Start
Slope Compensation
PFM/PWM
Mode Select
PFM/PWM
Comparator
Error Amplifier
_
+
Current
Sense
Driver
Shoot-Through
Logic
_
+
Undervoltage
Lockout
Bias Supply
10
_
+
Vref = 0.45 V
R2
R1
R1 + R2
≈ 1 MΩ
Power Good
Sync
+
Oscillator
_
+
Load Comparator
Current Sense
+
Offset
Antiringing
FB
N-Channel
Power MOSFET
P-Channel
Power MOSFET
L
PGND
EN
FB
PG
FC (See Note B)
VIN
GND
SYNC
ILIM
EN
(See
Note A)
TPS62000, TPS62001, TPS62002, TPS62003
TPS62004, TPS62005, TPS62006, TPS62007, TPS62008
www.ti.com
SLVS294F – SEPTEMBER 2000 – REVISED AUGUST 2015
8.2 Functional Block Diagram
A.
The adjustable output voltage version does not use the internal feedback resistor divider. The FB pin is directly
connected to the error amplifier.
B.
Do not connect the FC pin to an external power source
8.3 Feature Description
8.3.1 Low Noise Antiringing Switch
An antiringing switch is implemented in order to reduce the EMI radiated from the converter during discontinuous
conduction mode (DCM). In DCM, the inductor current ramps to zero before the end of each switching period.
The internal load comparator turns off the low side switch at that instant thus preventing the current flowing
backward through the inductance which increases the efficiency. An antiringing switch across the inductor
prevents parasitic oscillation caused by the residual energy stored in the inductance (see Figure 11).
NOTE
The antiringing switch is only activated in the fixed output voltage versions. It is not
enabled for the adjustable output voltage version TPS62000.
8.3.2 Enable
Logic low on EN forces the TPS6200x into shutdown. In shutdown, the power switch, drivers, voltage reference,
oscillator, and all other functions are turned off. The supply current is reduced to less than 1
μA in the shutdown
mode.
Copyright © 2000–2015, Texas Instruments Incorporated
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Product Folder Links: TPS62000 TPS62001 TPS62002 TPS62003 TPS62004 TPS62005 TPS62006 TPS62007
TPS62008


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