LCDP1521RL STMicroelectronics, LCDP1521RL Datasheet - Page 6

• Manufacturer Part Number: LCDP1521RL
• Description: IC TVS DUAL PROGR SLIC 8SOIC
• Manufacturer: STMicroelectronics

Specifications of LCDP1521RL

• Technology: Programmable TVS
• Number Of Circuits: 2
• Applications: SLIC
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Voltage - Working: -
• Voltage - Clamping: -
• Other names: 497-6444-2; LCDP1521RL

Technical information
4
6/12
Table 7.
Technical information
Figure 6.
Figure 6
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.
When a negative surge occurs on one wire (L1 for example), a current I
base of the transistor T1 and then injects a current in the gate of the thyristor Th1. Th1 fires
and all the surge current flows through the ground. After the surge when the current flowing
through Th1 becomes less negative than the holding current I
When a positive surge occurs on one wire (L1 for example), the diode D1 conducts and the
surge current flows through the ground.
The capacitor C is used to speed up the crowbar structure firing during the fast surge edges.
This minimizes the dynamic breakover voltage at the SLIC Tip and Ring inputs during fast
strikes. Note that this capacitor is generally present around the SLIC - V
So, to be efficient, it has to be as close as possible to the LCDP1521 Gate pin and to the
reference ground track (or plan). The optimized value for C is 220 nF.
The series resistors Rs1 and Rs2 in
are mandatory to withstand the power contact or the power induction tests imposed by the
1.2
Pulse (µs)
10
GND
t
2
r
L 1
L 2
shows the classic protection circuit using the LCDP1521 crowbar concept. This
700
50
10
t
p
Test circuit component values
LCDP1521 concept behavior
1500
1500
2500
(V)
V
p
(μF)
-Vbat
C
20
10
1
Rs2
1
Rs1
C
Doc ID 8627 Rev 4
(nF)
200
C
33
IG
0
2
Gate
Figure 6
(μH)
1.1
L
0
0
represent the fuse resistors or the PTC which
T1
(Ω)
1.3
R
50
76
1
Th1
(Ω)
R
15
13
0
2
TIP
RING
H
, then Th1 switches off.
(Ω)
R
25
25
3
3
D1
(Ω)
ID1
R
G
25
25
3
BAT
4
flows through the
pin.
GND
I
(A)
10
15
10
PP
LCDP1521
VRing
V Tip
110
245
(Ω)
R
60
s