SI9110DY-T1 Vishay, SI9110DY-T1 Datasheet - Page 6

• Manufacturer Part Number: SI9110DY-T1
• Description: Current Mode PWM Controllers 1% High-Voltage Switchmode
• Manufacturer: Vishay

Specifications of SI9110DY-T1

• Number Of Pwm Outputs: 1
• On/off Pin: Yes
• Adjustable Output: No
• Switching Freq: 1MHz
• Operating Supply Voltage (max): 13.5V
• Synchronous Pin: No
• Rise Time: 40ns
• Fall Time: 40ns
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: SOIC N
• Number Of Outputs: 1
• Mounting Style: SMD/SMT
• Package / Case: SOIC-14 Narrow
• Switching Frequency: 1000 KHz
• Operating Supply Voltage: 9.5 V to 13.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Topology: Flyback, Forward, Push-Pull
• Pwm Type: Current Mode PWM Controller
• Lead Free Status / RoHS Status: Not Compliant

Si9110, Si9111
Vishay Siliconix
DETAILED DESCRIPTION (CONT’D)
Oscillator Section
The oscillator consists of a ring of CMOS inverters,
capacitors, and a capacitor discharge switch. Frequency is
set by an external resistor between the OSC IN and OSC
OUT pins. (See Figure 5 for details of resistor value vs.
frequency.) The DISCHARGE pin should be tied to - V
normal internal oscillator operation. A frequency divider in
the logic section limits switch duty cycle to  50 % by locking
the switching frequency to one half of the oscillator
frequency.
Remote synchronization is accomplished by capacitive
coupling of a positive SYNC pulse into the OSC IN (pin 8)
terminal. For a 5 V pulse amplitude and 0.5 µs pulse width,
typical values would be 100 pF in series with 3 k to pin 8.
SHUTDOWN and RESET
SHUTDOWN (pin 11) and RESET (pin 12) 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
simultaneously having SHUTDOWN 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.
APPLICATIONS
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon
Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and
reliability data, see www.vishay.com/ppg?70004.
www.vishay.com
6
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
- 48 V
GND
0.1 µ F
is
off
whenever
FEEDBACK
20 µ F
V
0.1 µ F
CC
SHUTDOWN
0.022 µ F
390 k
240 k
Figure 6. 5 Watt Power Supply for Telecom Applications
This document is subject to change without notice.
13
14
10
6
1
is
low.
Si9110
5
IN
2
for
By
OSC SYNC PULSE
9
(If Needed)
8
7
4
3
100 pF
150 k
Table 1. Truth Table for the SHUTDOWN and RESET Pins
Both pins have internal current source pull-ups and should
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 or RESET pins to
provide variable shutdown time.
Output Driver
The push-pull driver output has a typical on-resistance of
20  . Maximum switching times are specified at 75 ns for a
500 pF load. This is sufficient to directly drive MOSFETs
such as the 2N7004, 2N7005, IRFD120 and IRFD220.
Larger devices can be driven, but switching times will be
longer, resulting in higher switching losses. In order to drive
large MOSPOWER devices, it is necessary to use an
external driver IC, such as the Vishay Siliconix D469A. The
D469A can switch very large devices such as the
SMM20N50 (500 V, 0.3 ) in approximately 100 ns.
SHUTDOWN
H
H
L
L
3 k
2N7004
1
1 Ω
/
2
W
1N4148
RESET
1N5822
1N5819
H
H
L
L
1 µ F
Normal Operation (No Change)
Off (Latched, No Change)
S11-0975-Rev. I, 16-May-11
18 k
12 k
Document Number: 70004
Normal Operation
Off (Not Latched)
www.vishay.com/doc?91000
Off (Latched)
47 µ F
220 µ F
Output
To Pin 6 V
Feedback
To Pin 14
+ 5 V
at 0.75 A
- 5 V
at 0.25 A
CC