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MC33341D

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
MC33341
http://onsemi.com
13
R3
Load
R1
Battery or
Resistive
Load
Source
Return
Source
R2
R
S
Comp
The above figure shows the MC33341 configured for load low−side current sensing allowing common paths for both power and ground
,
between the source and load. The Noninverting input paths, Pins 1 and 4, are used to sense the load induced voltage drop that appear
s
across resistor R
S
. The internal voltage and current regulation thresholds are selected by the respective external connections of Pins 2 an
d
6. Resistor R3 is required in applications where high peak levels of load current are possible from the battery or load bypass capacitor. Th
e
resistor value should be chosen to limit the negative substratecurrent to less than 20 mA. Excessively large values for R3 will degrade th
e
current sensing accuracy.
V
reg
+ V
th(V)
ǒ
R2
R1
) 1
Ǔ
+ 1.2
ǒ
R2
R1
) 1
Ǔ
I
reg
+
V
th(ILS))
R
S
+
0.2
R
S
R3 +
ǒ
I
pk
R
S
Ǔ
–0.6
0.02
V
I
Load
8765
1234
R
R
R
R
R
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
0.4 V
1.2 V
R
0.2 V
V
CC
0.2 V 0.4 V 1.2 V
V
CC
1.2 V
V
CC
Inverting Amp
Transconductance
Amp
Differential Amp
Disable Logic
Differential Amp
Opto
Isolator
V
sen
V
th
I
sen
I
th
Reference
Figure 20. Load Low−Side Current Sensing with
Internally Fixed Current and Voltage Thresholds
MC33341
http://onsemi.com
14
R3
Load
R1
Battery or
Resistive
Load
Source
Return
Source
R2
R
S
Comp
The above figure shows the MC33341 configured for load low−side current sensing with an externally adjustable voltage and curren
t
threshold. Operation of this circuit is similar to that of Figure 20. The respective voltage and current regulation threshold can be adjusted
over a range of 0 to 1.2 V and 0 V to 200 mV, with respect to Pin 4.
V
I
Load
8765
1234
R
R
R
R
R
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
0.4 V
1.2 V
R
0.2 V
V
CC
0.2 V 0.4 V 1.2 V
V
CC
1.2 V
V
CC
Inverting Amp
Transconductance
Amp
Differential Amp
Disable Logic
Differential Amp
Opto
Isolator
V
sen
V
th
I
sen
I
th
Reference
Figure 21. Load Low−Side Current Sensing with
Externally Adjustable Current and Voltage Thresholds
V
reg
+ V
th(Pin6)
ǒ
R2
R1
) 1
Ǔ
I
reg
+
V
th(Pin2)
R
S
R3 +
ǒ
I
pk
R
S
Ǔ
–0.6
0.02
Current
Control
Voltage
Current
MC33341
http://onsemi.com
15
LoadSource
Source
Load
1
8765
234
MC33341
Figure 22. Current Sense Resistor Bounding
Figure 23. Multiple Output Current and Voltage Regulation
Source
Source
Return
Load
Load
Output
Short
1
8765
234
Input
Short
R
S
MC33341
NOTE: An excessive load induced voltage across R
S
can occur if either the source input or load output is shorted. This voltage can
easily be bounded with the addition of the diodes shown without degrading the current sensing accuracy. This bounding technique
can be used in any of the MC33341 applications where high peak currents are anticipated.
NOTE: Multiple outputs can be controlled by summing the error signal into a common optoisolator. The converter output with the largest
voltage or current error will dominate control of the feedback loop.
Source
Return
Load
1
8765
234
MC33341
Output 2
Output 1
Output Common
Opto
Isolator
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MC33341D

Mfr. #:
Buy MC33341D
Manufacturer:
ON Semiconductor
Description:
Battery Management 2.3-15V Power Supply
Lifecycle:
New from this manufacturer.
Delivery:
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