LCDP1521_06 Datasheet, PDF (6/11 Pages) STMicroelectronics – Dual line programmable transient voltage suppressor for SLIC protection

4 Test circuit for v_fp and v_dgl parameters
4 Test circuit for v_fp and v_dgl parameters
LCDP1521
(VP is defined in unload condition)
L
R2
VP
C1
R1
R4
R3
C2
TIP
RING
GND
Table 1. Test circuit component values
Pulse (µs)
V_p
C₁
C₂
L
R₁
R₂
R₃
R₄
I_PP
R_s
tr
tp
(V) (µF) (nF) (µH) (Ω) (Ω) (Ω) (Ω) (A) (Ω)
10 700 1500 20 200
0
50
15
25
25
10 110
1.2
50 1500 1
33
0
76
13
25
25
15
60
2
10 2500 10
0
1.1 1.3
0
3
3
10 245
5 Technical information
Figure 2. LCDP1521 concept behavior.
L1
GND
Rs1
TIP
V Tip
ID1
IG
T1
Th1
D1
-Vbat ^Gate
GND
C
Rs2
L2
RING
VRing
Figure 2 shows the classical protection circuit using the LCDP1521 crowbar concept. This
topology has been developed to protect the new high voltage SLICs. This supports the
programming of the negative firing threshold while the positive clamping value is fixed at GND.
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