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TPS92640PWPR Datasheet(PDF) 11 Page - Texas Instruments

No. de Pieza. TPS92640PWPR
Descripción  Synchronous Buck Controllers for Precision Dimming LED Drivers
Descarga  37 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS92640PWPR Datasheet(HTML) 11 Page - Texas Instruments

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IN
OUT
OFF
ON
ON
V
V
T
T
T
D
u
K
CS
LED
OUT
V
V
V
VIN
RON
UDIM
VOUT
VREF
IADJ
COMP
SDIM
HG
SW
BOOT
VCC
LG
CS
GND
SDRV
DAP
TPS92640/641
PWM
*SDIM
VIN
CIN1
CIN2
RUDIM1
RUDIM2
RUDIM3
CON
RON
RVOUT2
CVREF
RIADJ1
RIADJ2
CCOMP
RHG
RLG
CBOOT
DBOOT
RF
CVCC
RCS
L
QHS
QLS
*QSDIM
COUT
RVOUT1
*TPS92641 ONLY
TPS92640, TPS92641
www.ti.com
SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015
7.3 Feature Description
Figure 13. Synchronous Buck LED Driver
7.3.1 Controlled On-Time Architecture
The control architecture is a combination of valley current control and a one-shot on-timer that varies with input
and output voltage. The TPS92640 and TPS92641 devices use a series resistor in the LED path to sense both
average LED current and valley inductor current. During the time that the high side NFET is turned on (tON), the
input voltage charges up the inductor. When it is turned off (tOFF) and the low side NFET is turned on, the
inductor discharges. During both intervals, the current is supplied to the load keeping the LEDs forward biased.
Figure 14 shows the inductor current (iL) waveform for a buck converter operating in continuous conduction mode
(CCM). As the system changes input voltage or output voltage, duty cycle D is varied indirectly by changing both
tON and tOFF to regulate IL and ultimately ILED. For any buck regulator, duty cycle, D, is calculated using
Equation 1.
where
VCS is the voltage measured at the CS pin of the IC and η is the estimated or actual converter efficiency.
(1)
Copyright © 2012–2015, Texas Instruments Incorporated
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Product Folder Links: TPS92640 TPS92641


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