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TPS92641PWPR Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce TPS92641PWPR
Description  Synchronous Buck Controllers for Precision Dimming LED Drivers
Download  37 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS92641PWPR Fiches technique(HTML) 10 Page - Texas Instruments

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H.S.
Driver
VCC
SW
BOOT
End tON
SDIM
VOUT
RON
UDIM
CS
VIN
GND
OVP
SD
HG
SDRV
VREF
VOLTAGE
REFERENCES
370mV
1.276V
2.54V 3.03V
VCC BIAS
REGULATOR
VIN
VCC
VDD
VCC UVLO
THERMAL
SHUTDOWN
LOGIC
GATE DRIVE UVLO
VSW
Q
Q
R
S
DEAD TIME /
LEVEL SHIFT
VSW
tON
tOFF
LGATE Enable
DEAD
TIME
VCC
LG
TPS92640, TPS92641
VCC
+
-
3.05V
+
-
LEB TIMER
tON_Reset
tON_ Reset
TPS92641 ONLY
IADJ
COMP
L.S.
Driver
+
-
1.276V
PWM_DIM / UVLO
21µA
+
-
+
-
PWM_DIM
9R
R
2.54V
EA
FSW
+
-
VDD
1.276V
PWM
LOGIC
+
-
370mV
13ms FILTER
Shutdown
TPS92640, TPS92641
SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The TPS92640 and TPS92641 devices are synchronous N-channel MOSFET (NFET) controllers for step-down
(buck) current regulators, which are ideal for driving LED loads. They can accept wide input voltage range
allowing for greater flexibility in powering different series connected LED string combinations. The single current
sense pin with low adjustable threshold voltage provides an excellent method for regulating LED current while
maintaining high system efficiency. The TPS92640 and TPS92641 devices use valley current control with a
controlled on-time architecture that allows the converter to be operated at nearly constant switching frequency
without the need for slope compensation. The extremely accurate adjustable current sense threshold together
with the synchronous operation provides the capability to amplitude (analog) dim the LED current with high
contrast ratios. Excellent PWM dimming is attainable using the main NFETs or the external shunt FET driver
(TPS92641 only). The TPS92640 and TPS92641 devices incorporate 2-
Ω, 1-A internal gate drivers and supports
constant current operation up to 5 A. This simple controller contains all the features necessary to implement a
high-efficiency, versatile LED driver with precise dimming response.
7.2 Functional Block Diagram
10
Submit Documentation Feedback
Copyright © 2012–2015, Texas Instruments Incorporated
Product Folder Links: TPS92640 TPS92641


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