SI9105DN02-T1 VISHAY [Vishay Siliconix], SI9105DN02-T1 Datasheet - Page 7

• Manufacturer Part Number: SI9105DN02-T1
• Description: 1-W High-Voltage Switchmode Regulator
• Manufacturer: VISHAY [Vishay Siliconix]

DETAILED DESCRIPTION (CONT’D)
SHUTDOWN and RESET
SHUTDOWN and RESET are intended for overriding the
output MOSFET switch via external control logic. The two
inputs are fed through a latch preceding the output switch.
Depending on the logic state of RESET, SHUTDOWN can
be either a latched or unlatched input. The output is off when-
ever SHUTDOWN is low. By simultaneously having SHUT-
DOWN and RESET low, the latch is set and SHUTDOWN
has no effect until RESET goes high. The truth table for these
inputs is given in Table 1.
Both pins have internal current source pull-ups and can be
left disconnected when not in use. An added feature of the
current sources is the ability to connect a capacitor and an
open-collector driver to the SHUTDOWN pin to provide vari-
able shutdown time.
APPLICATIONS
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech-
nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability
data, see http://www.vishay.com/ppg?70003.
Document Number: 70003
S-70497-Rev. I, 19-Mar-07
20 µF
+V
INPUT GND (GND Plane)
IN
+
-
0.1 µF
0.1
µF
910 k
0.1
µF
NC
820 k
8
7
12
10
1
2
Si9105DJ
5
Figure 5. CCITT Compatible ISDN Terminal Power Supply
NC
11
9
14
13
3
6
4
15 k
3.9 Ω
0.22 µF
Output Switch
The output switch is a 7 Ω , 200 V lateral DMOS transistor.
Like discrete MOSFETs, the switch contains an intrinsic
body-drain diode. However, the body contact in the Si9105 is
connected internally to - V
SOURCE.
Table 1. Truth Table for the SHUTDOWN and RESET Pins
47.5 k
71.5 k
1 %
1 %
SHUTDOWN
L
p
12 V
H
H
L
L
= 3.8 mH
1N4148
1 µF
10
7
8
9
RESET
H
H
L
L
IN
2
3
4
1N5819
1N5819
0.1 µF
0.1 µF
Normal Operation (No Change)
and is independent of the
Off (Latched, No Change)
Vishay Siliconix
Normal Operation
Off (Not Latched)
Off (Latched)
Output
150 k
5.6 V
www.vishay.com
Si9105
OUTPUT
-
+ 5 V
220 µF
47 µF
5 V
7