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参数资料
型号： SI9112DY-T1-E3
厂商： Vishay Intertechnology,Inc.
英文描述： High-Voltage Switchmode Controller
中文描述： 高电压开关模式控制器
文件页数： 6/6页
文件大小： 71K
代理商： SI9112DY-T1-E3
Si9112
Vishay Siliconix
www.vishay.com
6
sDocument Number: 70005
S-42036—Rev. H, 15-Nov-04
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 Typical Characteristics for details of resistor value vs.
frequency.) The DISCHARGE pin should be tied to
V
IN
for
normal internal oscillator operation. A frequency divider in the
logic section limits switch duty cycle to
switching frequency to one half of the oscillator frequency.
50% by locking the
Remote synchronization can be accomplished by capacitive
coupling of a SYNC pulse into the OSC IN (pin 8) terminal. For
a 5-V pulse amplitude and 0.5- s 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 is off whenever SHUTDOWN is low. By simultaneously
having SHUTDOWN and RESET low, the latch is set and
SHUTDOWN has no effect until RESET goes high. The truth
Table 1:
Truth Table for the SHUTDOWN and RESET Pins
SHUTDOWN
RESET
Output
H
H
Normal Operation
H
Normal Operation (No Change)
L
H
Off (Not Latched)
L
L
Off (Latched)
L
Off (Latched, No Change)
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 60-V, 25-A MOSFETs.
Larger devices can be driven, but switching times will be
longer, resulting in higher switching losses.
For applications information refer to AN703.
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
http://www.vishay.com/ppg70005
.
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