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3. Major features
3.1. Slew rate control
Figure 3.1.1 shows the switch-on waveforms of a load switch with discrete solution having only
back-to-back MOSFETs. For this evaluation, a 4.7μF output capacitor was used. The peak output
current reached 7 to 8A when the load current was set to 5A. The load might be broken or damaged
by the peak current, depending on a type of load. In addition, the ringing caused by the peak current
might generate electromagnetic interference (EMI) that affects bad impact to electronic circuits. So
it is necessary to suppress inrush current during switch-on transitions. Figure 3.1.2 shows an
enlarged view of the ringing waveforms.
Gate voltage
(5V/div)
Output current
(5A/div)
Output voltage
(5V/div)
Figure 3.1.1 Example of waveforms of a load switch with discrete solution
Gate voltage
(5V/div)
Output current
(5A/div)
Output voltage
(5V/div)
Figure 3.1.2 Example of waveforms of a load switch with discrete solution
© 2018
Toshiba Electronic Devices & Storage Corporation
100μs/div
100μs/div
(enlarged view)
5 / 15
RD002-RGUIDE-01
Test conditions:
Input voltage = 5V
Gate voltage = 0 ⇔ 5V
Output current= 5A
C
＝ 4.7μF
OUT
Test conditions:
Input voltage = 5V
Gate voltage = 0 ⇔ 5V
Output current: 5A
C
＝ 4.7μF
OUT
2018-03-07
Rev. 1
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