Application
DATA
Typically used with control IC for power supply protection circuits, charging/discharging
control circuits of battery-packages, and motor control circuits.
For power supply protection and motor control application
protection circuits
: Current sensor
Let Re be 0.2 ohm:
control circuit
Resistance Distribution
A basic voltage-to-current converter
2
Tr2
Tr1
B
E
Re
Re
1
input voltage
Load
Vi
15V
Rf
R
1
R2
R3
Rs
Ιo
2R2
R10
Assurance range
Assurance range
Referance range
2.0
1.5
0.5
1.0
0
1.0
1.5
0.5
2.0
Resistance tolerance (%)
R022
R10
3.0
2.0
1.0
0
1.0
2.0
3.0
Resistance tolerance (%)
RL0510 RL1220
1R0
Load
<Electric characteristics>
n50 n50
Ι
4R7
(1) A protection circuit
(2) To control the current and function
Power supply: To control the charge or discharge current and stabilize load.
Motor: To control the rotation speed, either steady or variable.
When loading current is low, current flows in direction 1. When
loading current is increased to a certain level and turns Tr2 on,
current flows in direction 2 and turns off Tr1.
When I is 1 ampere, voltage between B and E is 0.2 volt.
When I is 2 amperes, voltage between B and E is 0.4 volts.
When I is 3 amperes, voltage between B and E is 0.6 volts and
turns Tr2 on.
Compare to conventional type low ohmic chip resistors, the structure of this RL-series has higher thermal dissipation (patent No 2963671)
rate, able to assure lower surface temperature rising and lower thermal effect on surrounding parts. Strongly recommended component.
Assume Vi is the input voltage on the current sensor, then output
current Io could be formulated as follows:
The output current is controllable and independent of load R.
R
1Rs
ViRf
Ιo
Excellent initial characteristics, large heat dissipation, low temperature rise and excellent temperature characteristics assure high
accuracy, contributing to longevity of battery packages.
