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LM2743 数据表(PDF) 11 Page - Texas Instruments

部件名 LM2743
功能描述  LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
Download  41 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM2743 数据表(HTML) 11 Page - Texas Instruments

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0.65 = VOUT1
RT1
RT1 + RT2
Master Power
Supply
VOUT1 = 5V
SS/TRACK
LM2743
RT2
1 k:
RT1
150:
RFB2
10 k:
RFB1
5 k:
FB
VOUT2 = 1.8V
VSS = 0.65V
VFB
RFADJ = -5.93 + 3.06
10
7
fSW
+ 0.24
10
12
(fSW)
2
RFB1
VOUT =
RFB1
RFB2
+
VFB
(VFB = 0.6V)
LM2743
www.ti.com
SNVS276H – APRIL 2004 – REVISED OCTOBER 2015
Feature Description (continued)
CSS is in µF and tSS is in ms
(1)
During soft start the Power Good flag is forced low and it is released when the FB pin voltage reaches 70% of
0.6V. At this point the chip enters normal operation mode, and the output overvoltage and undervoltage
monitoring starts.
7.3.2 Normal Operation
While in normal operation mode, the LM2743 regulates the output voltage by controlling the duty cycle of the
high side and low side MOSFETs (see Typical Application Diagram). The equation governing output voltage is:
(2)
The PWM frequency is adjustable between 50 kHz and 1 MHz and is set by an external resistor, RFADJ, between
the FREQ pin and ground. The resistance needed for a desired frequency is approximately:
(3)
Where fSW is in Hz and RFADJ is in kΩ.
7.3.3 Tracking a Voltage Level
The LM2743 can track the output of a master power supply during soft-start by connecting a resistor divider to
the SS/TRACK pin. In this way, the output voltage slew rate of the LM2743 will be controlled by the master
supply for loads that require precise sequencing. When the tracking function is used no soft-start capacitor
should be connected to the SS/TRACK pin. Otherwise, a CSS value of at least 1 nF between the soft-start pin
and ground should be used.
Figure 19. Tracking Circuit
One way to use the tracking feature is to design the tracking resistor divider so that the master supply’s output
voltage (VOUT1) and the LM2743’s output voltage (represented symbolically in Figure 19 as VOUT2, that is, without
explicitly showing the power components) both rise together and reach their target values at the same time. For
this case, the equation governing the values of the tracking divider resistors RT1 and RT2 is:
(4)
Copyright © 2004–2015, Texas Instruments Incorporated
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