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UC2578DP Datasheet

  • UC2578DP

  • Buck Pulse Width Modulator Stepdown Voltage Regulator

  • 135.81KB

  • 7頁(yè)

  • TI

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UC2578
UC3578
Buck Pulse Width Modulator Stepdown Voltage Regulator
FEATURES
鈥?/div>
Provides Simple Single Inductor Buck
PWM Step-Down Voltage Regulation
鈥?/div>
Drives External High Side NMOS
Switch
鈥?/div>
14V to 72V Input Voltage Operating
Range
鈥?/div>
Contains 100kHz Internal Oscillator,
2V Reference and UVLO
鈥?/div>
Soft Start on Power Up
鈥?/div>
Overcurrent Shutdown Followed by
Soft Start
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.
ORDERING INFORMATION
UC2578DP
UC2578N
UC3578DP
UC3578N
TEMPERATURE RANGE
鈥?0擄C to +85擄C
0擄C to +70擄C
PACKAGE
Power SOIC
Power PDIP
Power SOIC
Power PDIP
TYPICAL APPLICATION DIAGRAM
R
SENSE
0.12
C
S
1000pF
47碌F
1N4148
11
DIODE
14 VCC
C
CC
1碌F
16
SS
UC3578
15
CS
10
VGG
R
S
1k
15-40 V
IN
IRFZ34
L
OUT
40碌H
1碌F
C
OUT
220碌F
V
OUT
C
GG
1碌F
15
RECTIFIER
MBR 3100
5k
10
7
OUT
6
SRC
EAINV
2
220pF
100k
GND GND GND GND
4
C
SS
5
12
13
EAOUT
3
1k
2200pF
50k
R1
UDG-99064
05/99

UC2578DP 產(chǎn)品屬性

  • 40

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電壓模式

  • 1

  • 120kHz

  • 90%

  • 14 V ~ 72 V

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • -40°C ~ 85°C

  • 16-SOIC（0.154"，3.90mm 寬）

  • 管件

  • 296-19029-5

UC2578DP相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
  • 英文版
    Advanced Regulating Pulse Width Modulators
    TI [Texas ...
  • 英文版
    Regulating Pulse Width Modulator
    TI
  • 英文版
    Regulating Pulse Width Modulator
    TI [Texas ...
  • 英文版
    Power Supply Supervisory Circuit
    TI
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    Power Supply Supervisory Circuit
    TI [Texas ...
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    Power Supply Supervisory Circuit
    TI
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    Power Supply Supervisory Circuit
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    Primary Side PWM Controller
    TI
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    Primary Side PWM Controller
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    Negative Output Flyback Pulse Width Modulator
    TI
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    Negative Output Flyback Pulse Width Modulator
    TI [Texas ...
  • 英文版
    Buck Pulse Width Modulator Stepdown Voltage Regulator
    TI [Texas ...
  • 英文版
    Simple Step-Up Voltage Regulator
    TI
  • 英文版
    Simple Step-Up Voltage Regulator
    TI [Texas ...
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    Buck Pulse Width Modulator Stepdown Voltage Regulator
    TI
  • 英文版
    Buck Pulse Width Modulator Stepdown Voltage Regulator
    TI [Texas ...
  • 英文版
    Secondary Side Synchronous Post Regulator
    TI
  • 英文版
    Secondary Side Synchronous Post Regulator
    TI [Texas ...
  • 英文版
    Advanced Regulating Pulse Width Modulators
    TI
  • 英文版
    Advanced Regulating Pulse Width Modulators
    TI [Texas ...

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