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RTKA211405DE0000BU Evaluation Board Manual
1.5
Enable
EN is connected to VIN through R
pin floating.
1.6
Soft-Start
RAA211405 is naturally current limited and automatically provides a smoothly rising V
Because the total output of the device is limited, a startup with a heavy load generates a longer V
startup with no load generates a faster ramp.
The approximate soft-start time
360µs at full load.
1.7
Switching Frequency
The regulator is a variable frequency converter, and the switching frequency varies proportionally to the load. The
maximum switching frequency is dependent on inductance and input voltage.
Figure 2
and
Figure 3
show the bench data for the evaluation board. Use
frequency.
SwitchingFrequency
(EQ. 1)
400
350
300
250
200
150
100
50
0
0
5
10
Figure 2. Switching Frequency (Full Load, 300mA)
vs Input Voltage
1. Test conditions: V
= 24V, C
IN
(PN:63SXV56M), L = 10µH (PN:
at nominal V
. Measured from 0 and 100% of nominal V
OUT
R16UZ0071EU0101 Rev.1.01
Dec 1, 2023
. EN can be driven by an external source or by removing R
2
[1]
based on the RTKA211405DE00BU with 24V input at no load is 190µs and
=
----------------------------------------------------------------------------------------------------------------------------------------------
LxIpeakxIpeakx
L = 10µH
15
20
25
30
35
Input Voltage (V)
= 22µF (PN:GRM187R61A226ME15D), C
OUT
74438335100
), Power supply: Chroma-632012P-100-50, Load: Resistive Load equivalent to full load
2xIload
1
1
------------------------------- -
+
--------------- -
Efficiency
V
–
V
V
IN
OUT
OUT
400
350
300
250
200
150
100
50
0
0
50
40
Figure 3. Switching Frequency (V
= 4.7µF (PN:CL21A475KBQNNNE), C
IN1
.
OUT
. Do not leave this
2
voltage at power up.
OUT
Equation 1
to approximate the switching
100
150
200
Load Current (mA)
vs Load Current
ramp; a
OUT
L = 10µH
250
300
24V)
IN
= 56µF
IN2
Page 4
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