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TPS61300YFFR Datasheet(PDF) 53 Page - Texas Instruments

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No. de Pieza. TPS61300YFFR
Descripción  TPS6130xx 1.5-A and 4.1-A Multiple LED Camera Flash Driver With I2C Compatible Interface
Descarga  70 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61300YFFR Datasheet(HTML) 53 Page - Texas Instruments

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t - Time = 1 s/div
I
(500mA/div)
L
V
(1V/div)
OUT
V = 3.6V,
IN
V
= 4.95V
I
= 0mA
OUT
OUT
ENPSM bit = 1, ILIM bit = 0
Tx-MASK = 0
TPS61305
(NRESET = 1)
PG (2V/div)
HC_SEL, ENVM (2V/div)
PG (2V/div)
TPS61305
(NRESET=1)
V
(1V/div)
OUT
I
(200mA/div)
L
ENVMbit=1
V
=3.6V,V
=4.95V,
I
=0mA
IN
OUT
OUT
ENPSMbit=1,ILIMbit=0,
Tx-MASK=1,HC_SEL =1
t-Time=1s/div
t - Time = 1 s/div
I
(100mA/div)
L
V
(1V/div)
OUT
V = 3.6V,
IN
V
= 4.95V
I
= 0mA
OUT
OUT
ENPSM bit = 1
TPS61305 (NRESET = 1)
PG (2V/div)
HC_SEL (2V/div)
t - Time = 2 s/div
I
(200mA/div)
L
V
(2V/div)
OUT
V = 3.6V,
IN
V
= 4.95V
I
= 0mA
OUT
OUT
ENPSM bit = 1, ILIM bit = 0
Tx-MASK = 1
TPS61305
(NRESET = 1)
PG (2V/div)
HC_SEL, ENVM (2V/div)
53
TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
www.ti.com
SLVS957E – JUNE 2009 – REVISED APRIL 2016
Product Folder Links: TPS61300 TPS61301 TPS61305
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
9.2.1.2.5
Checking Loop Stability
The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signals:
Switching node, SW
Inductor current, IL
Output ripple voltage, VOUT(AC)
These are the basic signals that need to be measured when evaluating a switching converter. When the
switching waveform shows large duty cycle jitter or the output voltage or inductor current shows oscillations the
regulation loop may be unstable. This is often a result of improper board layout or L-C combination.
As a next step in the evaluation of the regulation loop the load transient response needs to be tested. VOUT can
be monitored for settling time, overshoot or ringing that helps judge the converter's stability. Without any ringing,
the loop has usually more than 45° of phase margin.
Because the damping factor of the circuitry is directly related to several resistive parameters, such as MOSFET
rDS(on), that are temperature dependant, the loop stability analysis has to be done over the input voltage range,
output current range, and temperature range.
9.2.1.3 Application Curves
Figure 75. Storage Capacitor Precharge (HC_SEL = 1)
Figure 76. Storage Capacitor Charge-Up (HC_SEL = 1)
Figure 77. Storage Capacitor Charge-Up (HC_SEL = 1)
Figure 78. Storage Capacitor Charge-Up (HC_SEL = 1)


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