[ AP2200]
2. Output voltage setting
The output voltage (V
TGT
) is selectable based on the SEL pin. (Table 5)
Table 5 Output voltage setting
SEL pin level
0
1
Output voltage (V
TGT
)
setting
4V
5V
3. MPPT control
The voltage step-up operation is paused per the cycle t
SH
and the open circuit voltage (V
OC
) of the
solar cell(s) is sampled. This PWM function first calculates the voltage (V
PM
) from VOC where the
maximum output can be obtained based on the solar cell properties and then controls the step-up
converter to obtain the voltage.
4. Output voltage control
The step-up converter always monitors V
OUT
. As soon as VOUT reaches the setting voltage (V
TGT
),
the converter stops the voltage step-up. When the voltage step-up operation is stopped, V
OUT
decreases due to load consumption. When V
OUT
drops by V
TGTHYS
or more form V
TGT
, the step-up
operation is restarted.
MS1462-E-00
7
AKM [ ASAHI KASEI MICROSYSTEMS ]
