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UC3578DP датащи(PDF) 1 Page - Texas Instruments

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номер детали UC3578DP
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3578DP датащи(HTML) 1 Page - Texas Instruments

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UC2578
UC3578
05/99
FEATURES
• Provides Simple Single Inductor Buck
PWM Step-Down Voltage Regulation
• Drives External High Side NMOS
Switch
• 14V to 72V Input Voltage Operating
Range
• Contains 100kHz Internal Oscillator,
2V Reference and UVLO
• Soft Start on Power Up
• Overcurrent Shutdown Followed by
Soft Start
Buck Pulse Width Modulator Stepdown Voltage Regulator
14
16
11
15
10
7
6
2
3
13
12
5
4
EAINV
EAOUT
GND
GND
SRC
OUT
SS
CS
VCC
GND GND
DIODE
VGG
UC3578
C
SS
2200pF
100k
220pF
50k
R1
1k
5k
C
GG
1
µF
15
C
CC
1
µF
47
µF
10
1N4148
C
S
1000pF
R
S
1k
R
SENSE
0.12
IRFZ34
15-40 V
IN
1
µF
C
OUT
220
µF
L
OUT
40
µH
RECTIFIER
MBR 3100
V
OUT
TYPICAL APPLICATION DIAGRAM
UDG-99064
DESCRIPTION
The UC3578 is a PWM controller with an integrated high side floating gate
driver. It is used in buck step down converters and regulates a positive
output voltage. Intended to be used in a distributed power system, the IC
allows operation from 14V to 72V input voltage which range includes the
prevalent telecomm bus voltages. The output duty cycle of the UC3578
can vary between 0% and 90% for operation over the wide input voltage
and load conditions.
The UC3578 simplifies the design of the single switch PWM buck converter
by incorporating a floating high side driver for an external N-channel
MOSFET switch. It also features a 100kHz fixed frequency oscillator, an
internal 2V precision reference, an error amplifier configured for voltage
mode operation, and a PWM comparator with latching logic.
Comple-
menting the traditional voltage mode control block, the UC3578 incorpo-
rates an overcurrent shutdown circuit with full cycle soft re-start to limit the
input current to a user defined maximum value during overload operation.
Additional functions include an under voltage lockout circuit to insure that
sufficient input supply voltage is present before any switching activity can
occur.
The UC2578 and the UC3578 are both available in surface mount and
thru-hole power packages.
TEMPERATURE RANGE
PACKAGE
UC2578DP
–40°C to +85°C
Power SOIC
UC2578N
Power PDIP
UC3578DP
0°C to +70°C
Power SOIC
UC3578N
Power PDIP
ORDERING INFORMATION
application
INFO
available
Not Recommended for New Designs


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