CURRENT SENSING RESISTORS
Principle of Current Sensing Resistance
Current Sensing Resistors (hereinafter referred to as CSR) is a current sensing resistor element, a detection element in the circuit that uses the feedback voltage difference to the control IC to assist it in determining the current state of the current. When the control IC obtains the signal from the CSR terminal, Then tell the action or measure to be taken by the components on the power circuit where it is located.
- CSR is a current sensing element
- Its function is to send the measured information to the IC comparator to determine subsequent actions.
- The accuracy of CSR is very important.
- Our company can provide high-precision (△R＜1%) high-power (P＞2W) products.
Features
| Test parameters | condition | In-factory acceptance criteria |
| Instantaneous overload current |
Test current=2.5*Pr; Ambient temperature=25±2℃; Power on=5 seconds |
± (1.0%+0.5mΩ) IEC60115-1 4.13 |
| High temperature exposure test | Test temperature=+155±2℃; time=1,000 hours |
± (1.0%+0.5mΩ) IEC60115-1 4.25 |
| Low temperature storage test |
Test temperature=-55±2℃; Time=1,000 hours |
± (1.0%+0.5mΩ) IEC60115-1 4.25 |
| High humidity load test |
Test voltage=maximum voltage; test temperature=60±2℃; Relative humidity=90%; Power on for 90 minutes, power off for 30 minutes; 1,000 hours |
± (2.0%+0.5mΩ) IEC60115-1 4.25 |
| Thermal shock test | [-55℃ 30 minutes→room temperature 3 minutes→+150℃ 30 minutes→room temperature 3 minutes] continuous cycle 100 times |
± (1.0%+0.5mΩ) IEC60115-1 4.19 |
| 70℃ load test |
Test voltage=Vmax; Test temperature=70±2℃; Power on for 90 minutes; Power off for 30 minutes; Last 1,000 hours |
± (2.0%+0.5mΩ) IEC60115-1 4.25 |
| Solderability |
Dip into the tin furnace at 245±5℃; Duration=3±1s; Observe the tin coverage of the electrode terminal |
Tin coverage area is greater than 95% |
| Engage in welding heat test | Put it into the reflow furnace at 275±5℃; Duration=20±1s |
± (1.0%+0.5mΩ) IEC60115-1 4.18 |
| Bending test |
Pivot point spacing=90mm; Bending amount=2mm; Test substrate: glass fiber epoxy resin, thickness: 1.6mm, 10 cycles |
± (1.0%+0.5mΩ) IEC60115-1 4.33 |
| Mechanical shock test | Impact acceleration=100G; time=11ms; last 5 times |
± (1.0%+0.5mΩ) IEC60115-1 4.21 |