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TPS53219ARGTT Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPS53219ARGTT
Descripción Electrónicos  Single Synchronous Step-Down Controller
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS53219ARGTT Datasheet(HTML) 11 Page - Texas Instruments

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background image
8
12
PGND
SW
TPS53219A
OCP
ZC
XCON
4
RF
FCCM
14 VBST
10 VDRV
PWM
3
VFB
TRIP
Auto-skip/FCCM
+
+
Delay
0.6 V +10/15%
0.6 V –5/10%
16 PGOOD
Control Logic
UDG-11274
10 mA
+
+
0.6 V –30%
0.6 V +20%
+
+
2
EN
Ramp Comp
Enable/SS Control
+
+
+
0.6 V
1
x(-1/8)
x(1/8)
Frequency
Setting
Detector
13 DRVH
11 DRVL
tON
One-
Shot
Auto-skip
UV
OV
7
GND
5
MODE
6
VDD
9
VREG
LDO Linear
Regulator
EN
TPS53219A
www.ti.com
SLUSAU4A – DECEMBER 2011 – REVISED DECEMBER 2015
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Enable and Soft-Start
When the EN pin voltage rises above the enable threshold voltage (typically 1.4 V), the controller enters its start-
up sequence. The internal LDO regulator starts immediately and regulates to 6.2 V at the VREG pin. The
controller then uses the first 250 µs to calibrate the switching frequency setting resistance attached to the RF pin
and stores the switching frequency code in internal registers. However, switching is inhibited during this phase. In
the second phase, an internal DAC starts ramping up the reference voltage from 0 V to 0.6 V. Depending on the
MODE pin setting, the ramping up time varies from 0.7 ms to 5.6 ms. Smooth and constant ramp-up of the
output voltage is maintained during start-up regardless of load current.
Copyright © 2011–2015, Texas Instruments Incorporated
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