Question

Q1. For the circuit shown in Fig. 1, one can have different combinations for the MOSFET T and diode D, as given in Table 1. Assuming that the load current is iL = 30 A constant, the components should be selected in such a way that the reverse recovery current peak (IRRM) of the diode (Di) does not cause the transistor (T) current to surpass its rated value (70 A). For this purpose: (a) Draw the MOSFET current (iT) waveforms for its OFF to ON transition (in one cycle of operation) and for different selections of D1, D2, and D3. (b) Referring to the obtained diagrams in (a), justify the feasibility or non-feasibility of T – Di combination for all cases in Table 2. Fig. 1. Table 1. Code of component | Reverse Recovery Current (A) | Rated Current (A) D1 | STTH2006TV | 18 | 180 D2 | STTH9012TV | 32 | 150 D3 | IDW100E60 | 49.5 | 100 T | IRFP4868PbF | 16 | 70 Graphs: Table 2. Combination | Feasible (?) or not feasible (?) | Reason T - D1 | T - D2 | T - D3 |

          Q1. For the circuit shown in Fig. 1, one can have different combinations for the MOSFET T and
diode D, as given in Table 1. Assuming that the load current is iL = 30 A constant, the components
should be selected in such a way that the reverse recovery current peak (IRRM) of the diode (Di)
does not cause the transistor (T) current to surpass its rated value (70 A). For this purpose:
(a) Draw the MOSFET current (iT) waveforms for its OFF to ON transition (in one cycle of
operation) and for different selections of D1, D2, and D3.
(b) Referring to the obtained diagrams in (a), justify the feasibility or non-feasibility of T –
Di combination for all cases in Table 2.

Fig. 1.

Table 1.
Code of component | Reverse Recovery Current (A) | Rated Current (A)
D1 | STTH2006TV | 18 | 180
D2 | STTH9012TV | 32 | 150
D3 | IDW100E60 | 49.5 | 100
T | IRFP4868PbF | 16 | 70

Graphs:

Table 2.
Combination | Feasible (?) or not feasible (?) | Reason
T - D1 |
T - D2 |
T - D3 |

Q1. For the circuit shown in Fig. 1, one can have different combinations for the MOSFET T and
diode D, as given in Table 1. Assuming that the load current is iL = 30 A constant, the components
should be selected in such a way that the reverse recovery current peak (IRRM) of the diode (Di)
does not cause the transistor (T) current to surpass its rated value (70 A). For this purpose:
(a) Draw the MOSFET current (iT) waveforms for its OFF to ON transition (in one cycle of
operation) and for different selections of D1, D2, and D3.
(b) Referring to the obtained diagrams in (a), justify the feasibility or non-feasibility of T –
Di combination for all cases in Table 2.

Fig. 1.

Table 1.
Code of component | Reverse Recovery Current (A) | Rated Current (A)
D1 | STTH2006TV | 18 | 180
D2 | STTH9012TV | 32 | 150
D3 | IDW100E60 | 49.5 | 100
T | IRFP4868PbF | 16 | 70

Graphs:

Table 2.
Combination | Feasible (?) or not feasible (?) | Reason
T - D1 |
T - D2 |
T - D3 |

Added by Michael G.

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