MC33341 Motorola, MC33341 Datasheet - Page 17

• Manufacturer Part Number: MC33341
• Description: POWER SUPPLY BATTERY CHARGER REGULATION CONTROL CIRCUIT
• Manufacturer: Motorola

Figure 25 shows that the MC33341 can be configured as a high–side constant–current constant–voltage switch mode charger.
This circuit operates as a step down converter. With a nominal input voltage and output load current as stated above, the
switching frequency is approximately 28 kHz with and an associated conversion efficiency of 86 percent. The switching fre-
quency will vary with changes in input voltage and load current.
MOTOROLA ANALOG IC DEVICE DATA
Ground
Input
Input
12 V
100
Figure 25. Constant–Current Constant–Voltage Switch Mode Charger
3.0 k
1.2 V
MTP2955
8
1
R
R
R
Differential Amp
Disable Logic
Differential Amp
Inverting Amp
R
1N5821
R
200 H
R
V CC
V CC
MC33341
0.4 V
7
2
100
V CC
V CC
1.2 V
V sen
I sen
V th
0.25
I th
0.2 V
V CC
V
I
6
3
V CC
Transconductance
V CC
0.2 V 0.4 V 1.2 V
Amp
Reference
V CC
V CC
5
4
68 k
12 k
Output
5.87 V/800 mA
Output
Ground
17