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LM5010SD 数据表(PDF) 10 Page - Texas Instruments

部件名 LM5010SD
功能描述  High-Voltage 1-A Step-Down Switching Regulator
Download  26 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM5010SD 数据表(HTML) 10 Page - Texas Instruments

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'I =
(VIN - VOUT) x tON
L1
V
IN
STOP
R
ON /SD
R
ON
Input
Voltage
LM5010
RUN
LM5010
SNVS307E – SEPTEMBER 2004 – REVISED FEBRUARY 2005
www.ti.com
The inverse relationship of tON vs. VIN results in a nearly constant frequency as VIN is varied. If the application
requires a high frequency the minimum value for tON, and consequently RON, is limited by the off-time (265 ns,
±15%) which limits the maximum duty cycle at minimum VIN. The tolerance for Equation 5 is ±25%. Frequencies
in excess of 1 MHz are possible with the LM5010.
Shutdown
The LM5010 can be remotely shut down by taking the RON/SD pin below 0.65V. See Figure 11. In this mode the
soft start pin is internally grounded, the on-timer is disabled, and the input current at VIN is reduced (Figure 7).
Releasing the RON/SD pin allows normal operation to resume. When the switch is open, the nominal voltage at
RON/SD is shown in Figure 6.
Figure 11. Shutdown Implementation
Current Limit
Current limit detection occurs during the off-time by monitoring the recirculating current through the free-wheeling
diode (D1). The detection threshold is 1.25A, ±0.25A. Referring to Typical Application Circuit and Block Diagram,
when the buck switch is off the inductor current flows through the load, into SGND, through the sense resistor, out
of ISEN and through D1. If that current exceeds the threshold the current limit comparator output switches to delay
the start of the next on-time period. The next on-time starts when the current out of ISEN is below the threshold
and the voltage at FB is below 2.5V. If the overload condition persists causing the inductor current to exceed the
threshold during each on-time, that is detected at the beginning of each off-time. The operating frequency is
lower due to longer-than-normal off-times.
Figure 12 illustrates the inductor current waveform. During normal operation the load current is IO, the average of
the ripple waveform. When the load resistance decreases the current ratchets up until the lower peak attempts to
exceed the threshold. During the Current Limited portion of Figure 12, the current ramps down to the threshold
during each off-time, initiating the next on-time (assuming the voltage at FB is < 2.5V). During each on-time the
current ramps up an amount equal to:
(6)
During this time the LM5010 is in a constant current mode, with an average load current (IOCL) equal to the
threshold +
ΔI/2.
The “valley current limit” technique allows the load current to exceed the current limit threshold as long as the
lower peak of the inductor current is less than the threshold.
10
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Copyright © 2004–2005, Texas Instruments Incorporated
Product Folder Links: LM5010


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