CMF20120D Datasheet, PDF (6/13 Pages) Cree, Inc – Silicon Carbide Power MOSFET

Stray inductance on source lead causes load
di/dt to be fed back into gate drive which
causes the following:
• Switch di/dt is limited
• Could cause oscillation
DRIVE
20V
R GATE
LOAD CURRENT
SiC DMOS
L STRAY
LOAD CURRENT
Kelvin gate connection with separate
source return is highly recommended
DRIVE
20V
R GATE
SiC DMOS
L STRAY




A^ schematic of the gate driver circuit used for characterization of the SiC MOSFET
i^s ^s^h^ow^n ^b^e^ï€lo^w^:^{}


+VCC
+VCC
C3
10u
THESE COMPONENTS ARE
LOCATED ON THE -VEE
PLANE
-VEE
-VEE
C1
10u
C2
100n
C4
THESE COMPONENTS ARE
LOCATED ON THE GND
PLANE
GND
-VEE
C6
10u
-VEE
+VCC
U1
LM2931T-5.0
1
IN
3
OUT
C10
100n
PULSE GEN INPUT
J1
BNC
1
R5
120
R4
330
R6
120
ISO1
2
3
-VEE
C11
100u
6.3V
8
7
6
6N137
-VEE
+VCC
R1
1
R2
390
C7
10u
C9
100n
C13
10n
-VEE
-VEE
-VEE
-VEE
C14
100n
U2
1
VCC
8
VCC
2
IN
7
OUT
3
NC
6
OUT
4
GND
5
GND
I XDI 414
-VEE
-VEE
-VEE
-VEE
100n
C5
100n
C8
100n
C12
100n
C15
100n
C16
100n
C17
D1
R3
TBD 1206
RB160M-60
R7
TBD 1206
D2
R8
TBD 1206
RB160M-60
J2
BNC
VGS MONITOR
1
PIN 1 SOURCE
PIN 2 GATE
-VEE
100n
C18
-VEE
100n
C19
-VEE
100n
C20
10u
-VEE


T_h_e_g_a_t_e_d_r_iv_e_r_is_a_n_I_X_Y_ï€S_{}I_X_D_I4_1_4_._T_h_is_d_e_v_ic_e_ï€h_a_s_a_3_5_V_{}o_u_p_u_t_s_w_i_n_g_,_o_u_t_p_u_t_{}
r_e_s_i_s_t_a_n_c_ï€e_o_f_0_._6_{}Ω_t_ï€y_p_ic_a_ï€l,_a_n_d_a_{}p_e_a_k_{}c_u_rr_en_t_ca_p_ab_i_li_ty_o_f_1_4_A_._T_h_e_e_x_t_e_r_n_a_l_{}
g_at_e_r_es_i_s_t_a_n_c_e_u_s_ed_f_o_r_ch_a_r_a_ct_e_r_i_z_a_t_io_n_o_f_th_e_S_i_C_M_O_S_F_E_T_{}w_a_s_6_.8_{ï€}Ω_._C_a_r_e_f_u_l_{}
c_o_n_s_id_e_r_a_t_io_n_n_e_e_d_s_t_o_b_e_g_i_v_e_ï€n_{}t_o_th_e_s_e_l_e_c_t_io_n_o_f_t_h_e_g_a_t_e_d_r_i_ï€v_e_r_._T_h_e_{ï€}t_y_p_ic_a_l_{}
application error is selection of a gate driver that has adequate swing, but output
6
CMF20120D Rev. -