MC34064, MC33064, NCV33064
1.0k
+
Power
Supply
−
−
+
1.2V
ref
3 (4)
2 (2)
1 (1)
+
−
2 (2)
1 (1)
−
+
1.2V
ref
3 (4)
Solar
Cells
Figure 11. Voltage Monitor
25mH
V
in
= 11.5
to 14.5V
470
22
4.7k
330
2 (2)
1N756
Test
+
680
1.2k
MPSW51A
+
470
1N5819
+
Figure 12. Solar Powered Battery Charger
V
O
= 5.0 V
I
O
= 50 mA
Conditions
V
in
= 11.5 V to 14.5 V, I
O
= 50 mA
V
in
= 12.6 V, I
O
= 0 mA to 50 mA
V
in
= 12.6 V, I
O
= 50 mA
V
in
= 12.6 V, I
O
= 50 mA
Results
35 mV
12 mV
60 mVpp
77%
Line Regulation
1 (1)
−
+
1.2V
ref
3 (4)
Load Regulation
Output Ripple
Efficiency
Figure 13. Low Power Switching Regulator
V
CC
R
L
MTP3055EL
270
4.6V
2 (2)
1 (1)
−
+
1.2V
ref
3 (4)
Overheating of the logic level power MOSFET due to insufficient gate voltage can be prevented with the above
circuit. When the input signal is below the 4.6 V threshold of the MC34064, its output grounds the gate of the L
2
MOSFET.
Figure 14. MOSFET Low Voltage Gate Drive Protection
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