Author: AtsushiT_61 Version: **
How can the rated output current of S6BP202A be increased under low input voltage condition?
Lower the switching frequency to increase S6BP202A’s rated output current at low input voltage.
Figure 1 shows the IVOUT vs VVIN graph for the default switching frequency of 2.1 MHz. For example, the rated output current is approximately 0.7 A when VVIN = 3.5V (Ta=+25°C).
Figure 1. IVOUT vs VVIN Graph
By setting the switching frequency to 200 kHz, the rated output current is increased to 1.2 A when VVIN = 3.5V (Ta=+25°C), as shown in Figure 2.
Figure 2. IVOUT vs VVIN Graph
To set the switching frequency to 200 kHz, use the following component values:
- Setting Resistor (RT) = 270 kΩ
- Inductor (L) = 22 μH (CLF12577NIT-220M-D)
- Input Capacitor (CIN) = 10 μF
- Select either of the option for Output Capacitor (COUT):
Polymer electrolytic HHXD160ARA151MF80G
See section 2.1.3 in AN99497 Designing a Power Management System with S6BP201A, S6BP202A, and S6BP203A for details on how to set the switching frequency.