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LMZ20502SILR bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  2A SIMPLE SWITCHER Nano Module
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background image
500µs/div
Output Voltage
2V/div
PG
EN
Input Current
1A/div
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current (A)
C001
LMZ20502
www.ti.com
SNVS852C – JUNE 2012 – REVISED APRIL 2015
Feature Description (continued)
Figure 9. Typical Current Limit Profile
VIN = 5 V, VOUT = 1.8 V
8.3.4 Start-Up
Start-up and shutdown of the LMZ20502 is controlled by the EN input. The characteristics of this input are found
in the Electrical Characteristics table. A valid input voltage must be present on VIN before the enable control is
asserted. The maximum voltage on the EN pin is 5.5 V or VIN, whichever is smaller. Do not allow this input to
float.
The LMZ20502 features a current limit based soft-start, that prevents large inrush currents and output overshoots
as the regulator is starting up. The peak inductor current is stepped-up in a staircase fashion during the soft start
period. A typical start-up event is shown in Figure 10:
Figure 10. Typical Start-Up Waveforms, VIN = 5 V,
VOUT = 3.3 V, IOUT = 1 A
8.3.5 Drop-Out Behavior
When the input voltage is close to the output voltage the regulator will operate at very large duty cycles. Normal
time delays of the internal circuits prevents the attainment of controlled duty cycles near 100%. In this condition
the LMZ20502 will skip switching cycles in order to maintain regulation with the highest possible input-to-output
ratio. Some increase in output voltage ripple may appear as the regulator skips cycles. As the input voltage gets
closer to the output voltage, the regulator will eventually reach 100% duty cycle, with the high side switch turned
on. The output will then follow the input voltage minus the drop across the high side switch and inductor
resistance. Figure 11 and Figure 12 show typical drop-out behavior for output voltages of 2.5 V and 3.3 V.
Copyright © 2012–2015, Texas Instruments Incorporated
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