MC33341 Motorola, MC33341 Datasheet - Page 12

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

The above figure shows the MC33341 configured for load high–side current sensing with an externally adjustable current
threshold. Operation of this circuit is similar to that of Figure 17. The current regulation threshold can be adjusted over a range
of 0 V to 200 mV with respect to Pin 4.
12
Source
Current
Control
Source
Return
Isolator
Opto
V reg
+
+
V
1.2 R2
th(V)
Externally Adjustable Current and Internally Fixed Voltage Thresholds
R1
R2
R1
)
)
1
1
1.2 V
Figure 18. Load High–Side Current Sensing with
8
1
R
R
R
Differential Amp
Disable Logic
Differential Amp
Inverting Amp
R
R
R
V CC
V CC
0.4 V
7
2
MC33341
I reg
V CC
V CC
+
1.2 V
V sen
I sen
V
V th
I th
th(Pin 2)
0.2 V
R
V CC
S
V
6
I
3
V CC
Transconductance
V CC
Comp
0.2 V 0.4 V 1.2 V
Amp
Reference
R3
V CC
V CC
MOTOROLA ANALOG IC DEVICE DATA
5
4
R2
R3
+
I
pk
R1
R
0.02
S
– 0.6
Load
Load
R S
Battery or
Resistive
Load