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LM3402MR Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte LM3402MR
Spiegazioni elettronici  0.5A Constant Current Buck Regulator
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DMAX =
tON
tON + tOFF-MIN
VO(max) = DMAX x VIN
IL-MIN =
0.2
RSNS
L
-
VO x tSNS
fSW =
VO
1.34 x 10
-10 x RON
VO = n x VF + 200 mV
LM3402/02HV
CS
VSNS
IF
RSNS
IF
+
-
VREF
+
-
One-shot
CS
Comparator
VO
VF
VF
LED 1
LED n
LM3402, LM3402HV
www.ti.com
SNVS450F – SEPTEMBER 2006 – REVISED OCTOBER 2015
Feature Description (continued)
At the conclusion of tON the power MOSFET turns off for a minimum OFF-time, tOFF-MIN, of 300 ns. Once tOFF-MIN
is complete the CS comparator compares VSNS and VREF again, waiting to begin the next cycle.
Figure 17. Comparator and One-Shot
The LM3402/HV regulators should be operated in continuous conduction mode (CCM), where inductor current
stays positive throughout the switching cycle. During steady-state operation in the CCM, the converter maintains
a constant switching frequency, which can be selected using Equation 2.
(2)
VF = forward voltage of each LED, n = number of LEDs in series
(3)
7.3.2 Average LED Current Accuracy
The COT architecture regulates the valley of
ΔVSNS, the AC portion of VSNS. To determine the average LED
current (which is also the average inductor current) the valley inductor current is calculated using Equation 4.
(4)
In Equation 4 tSNS represents the propagation delay of the CS comparator, and is approximately 220 ns. The
average inductor/LED current is equal to IL-MIN plus one-half of the inductor current ripple, ΔiL:
IF = IL = IL-MIN + ΔiL / 2
(5)
Detailed information for the calculation of
ΔiL is given in the Application and Implementation section.
7.3.3 Maximum Output Voltage
The 300 ns minimum off-time limits on the maximum duty cycle of the converter, DMAX, and in turn ,the maximum
output voltage VO(MAX) is determined by Equation 6:
(6)
Copyright © 2006–2015, Texas Instruments Incorporated
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