r2j20701np Renesas Electronics Corporation., r2j20701np Datasheet - Page 18
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r2j20701np
Manufacturer Part Number
r2j20701np
Description
Peak Current Mode Synchronous Buck Controller With Power Mosfets
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R2J20701NP.pdf
(28 pages)
R2J20701NP
The accuracy of Vout can be estimated by using equation (10).
For example, if Vout (typical) = 1.8 V, resistance variation is 1% (i.e. K1, K2 = 1.01 and 0.99),
and VFB = 594 mV to 606 mV:
Therefore, the output accuracy will be r2.3% under the above conditions.
Figure 5 shows the relationship between the accuracy of the resistance and the accuracy of the output voltage. The
resistor value must have an accuracy of 0.5% if the variation in output voltage from the system is to be kept within two
percent across the voltage range from 0.6 to 3.3 V.
REJ03G1459-0300 Rev.3.00 Jun 20, 2007
Page 18 of 27
Vout (typical)
Vout
=
=
= 2.36%
=
=
or
2.31%
Vout (typical)
3
2
1
0
1
2
3
0.5
606 mV
594 mV
Figure 5 Vout Accuracy vs. Vout Set Voltage
1.8 V
1.8 V
VFB
1.0
Vout (typical)
VFB (typical)
1.5
600 mV
600 mV
1.8 V
1.8 V
R = 0.5%
Vout (typical)
2.0
1
1
1
2.5
1.01
0.99
0.99
1.01
K1
K2
R = 1%
3.0
+ 1
+ 1
+ 1
3.5
1
1
1
100 (%)
100 (%)
100 (%)
(10)