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which diode i need to use between pinsof vcc and vb
arifv215

arifv215

@copilot which diode i need to use between pinsof vcc and vb
2y

copilot

For a setup involving the IR2101SPBF MOSFET driver from Infineon Technologies, when you're considering a diode between the VCC and VB pins (pins 1 and 8, respectively), the purpose is typically to ensure smooth charge flow to the high side gate driver circuit. This is usually aimed at situations where the high side MOSFET is being driven in a half-bridge configuration, ensuring that the bootstrap capacitor can recharge properly.
Given this context, the key characteristics for the diode would include:
  • Reverse Recovery Time: As low as possible to ensure quick switching and to reduce losses.
  • Reverse Voltage: Higher than the maximum voltage expected on VB to withstand potential voltage spikes.
  • Forward Current: Capable of handling the charging current of the bootstrap capacitor without significant voltage drop.
A common choice is a fast or ultrafast recovery diode. Assuming a general-purpose application with a supply voltage (VCC) up to 15V, which is typical for such drivers, and anticipating the need for a safety margin, I'm recommending a diode with the following assumed parameters:
  • Reverse Voltage (V_R): At least 20V, to provide headroom above the supply voltage.
  • Forward Current (I_F): Depending on the size of the bootstrap capacitor and the switching frequency, but typically a diode capable of 1A continuous forward current would suffice for most applications.
  • Reverse Recovery Time: Less than 100ns to minimize switching losses.
Based on these assumptions, a diode like the 1N5819 could be a suitable choice. It's a Schottky diode, which inherently has a low forward voltage drop and a quick reverse recovery time, making it efficient for this purpose.
Here's how you would connect it in your schematic in Flux:
  • Anode to U1:VCC (Pin 1)
  • Cathode to U1:VB (Pin 8)
This connection will allow the bootstrap capacitor (which should be connected between U1:VB (Pin 8) and U1:VS (Pin 6)) to recharge via VCC during the off cycles of the high side switch.
Keep in mind, the specific requirements of your project could necessitate adjustments to these recommendations. If your application operates at a significantly higher voltage or current, or if other specific conditions apply, you should consider diodes that more closely match your needs.
2y
arifv215

arifv215

what about 1N4148 ?
2y

copilot

The 1N4148 is a widely used, general-purpose switching diode known for its fast switching speeds (reverse recovery time is typically around 4 ns). However, it has specific characteristics that may or may not make it suitable for use between the VCC and VB pins of the IR2101SPBF driver, depending on the specific requirements of your application. Here's a brief evaluation considering its standard specifications:
  • Reverse Voltage ($V_R$): The 1N4148 typically has a maximum reverse voltage rating of 100V, which is comfortably higher than what's needed for most applications using the IR2101SPBF, assuming a VCC of up to 15V.
  • Forward Current ($I_F$): The maximum continuous forward current rating for the 1N4148 is about 300mA, which may or may not be sufficient depending on the charging current requirements of your bootstrap capacitor and the switching frequency of your circuit. High-side MOSFETs in half-bridge configurations, especially at higher switching frequencies or with large bootstrap capacitors, may require a diode capable of supporting higher currents.
  • Reverse Recovery Time: The 1N4148 excels with a very fast reverse recovery time ($<$4 ns), which is beneficial for reducing switching losses in fast-switching applications.
Given these points, the critical consideration when thinking about using the 1N4148 in a bootstrap circuit for the IR2101SPBF would be the forward current requirement. If your circuit operates at relatively low currents and the charging current requirement for the bootstrap capacitor is well within the 300mA limit, the 1N4148 could be technically used due to its fast switching characteristics. However, its relatively low forward current rating compared to power diodes designed for handling higher currents makes it less ideal for higher power applications.
Here are the assumptions under which the 1N4148 could be appropriate:
  • Your application involves low current requirements where the bootstrap capacitor's charging current does not exceed 300mA.
  • The switching frequency is such that the extremely fast reverse recovery time of the 1N4148 provides a notable advantage in minimizing switching losses.
If you decide to use the 1N4148, here's how you would connect it:
  • Anode to U1:VCC (Pin 1)
  • Cathode to U1:VB (Pin 8)
Please review the specifics of your application, particularly the expected high-side gate driving current and the switching frequency, to ensure the 1N4148 will meet your needs without being pushed beyond its ratings. For higher current applications, a Schottky diode like the 1N5819, or another diode with a higher forward current rating, might be more appropriate.
2y
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1
R14
Resistance
33kΩ
R15
Resistance
33kΩ
R8
Resistance
33kΩ
R10
Resistance
10kΩ
R11
Resistance
10kΩ
R7
Resistance
33kΩ
R13
Resistance
33kΩ
R9
Resistance
33kΩ
C5
Capacitance
10uF
R12
Resistance
10kΩ
U3
12V
D3
  • Generic Inductor
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    16.6k
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    jharwinbarrozo
    1.5M
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    43.0M
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