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參數(shù)資料
型號(hào): MC34129D
廠商: MOTOROLA INC
元件分類: 穩(wěn)壓器
英文描述: HIGH PERFORMANCE CURRENT MODE CONTROLLERS
中文描述: 1 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO14
封裝: PLASTIC, SO-14
文件頁(yè)數(shù): 1/16頁(yè)
文件大小: 347K
代理商: MC34129D
SEMICONDUCTOR
TECHNICAL DATA
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
PIN CONNECTIONS
Order this document by MC34129/D
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
P SUFFIX
PLASTIC PACKAGE
CASE 646
14
1
14
1
(Top View)
Drive Output
Drive Ground
Ramp Input
Sync/Inhibit
Input
RT/CT
Vref 2.5 V
Gnd
1
2
3
4
5
6
7
8
9
10
11
12
13
14 VCC
Start/Run Output
CSoft–Start
Feedback/
PWM Input
Error Amp
Inverting Input
Error Amp
Noninverting Input
Vref 1.25 V
Device
Operating
Temperature Range
Package
ORDERING INFORMATION
MC34129D
MC34129P
TA = 0
°
to +70
°
C
SO–14
Plastic DIP
MC33129D
MC33129P
SO–14
Plastic DIP
TA = –40
°
to +85
°
C
1
MOTOROLA ANALOG IC DEVICE DATA
The MC34129/MC33129 are high performance current mode switching
regulators specifically designed for use in low power digital telephone
applications. These integrated circuits feature a unique internal fault timer
that provides automatic restart for overload recovery. For enhanced system
efficiency, a start/run comparator is included to implement bootstrapped
operation of VCC. Other functions contained are a temperature compensated
reference, reference amplifier, fully accessible error amplifier, sawtooth
oscillator with sync input, pulse width modulator comparator, and a high
current totem pole driver ideally suited for driving a power MOSFET.
Also included are protective features consisting of soft–start,
undervoltage lockout, cycle–by–cycle current limiting, adjustable deadtime,
and a latch for single pulse metering.
Although these devices are primarily intended for use in digital telephone
systems, they can be used cost effectively in many other applications.
Current Mode Operation to 300 kHz
Automatic Feed Forward Compensation
Latching PWM for Cycle–by–Cycle Current Limiting
Continuous Retry after Fault Timeout
Soft–Start with Maximum Peak Switch Current Clamp
Internally Trimmed 2% Bandgap Reference
High Current Totem Pole Driver
Input Undervoltage Lockout
Low Startup and Operating Current
Direct Interface with Motorola SENSEFET Products
Simplified Block Diagram
+
Soft–Start
and
Fault Timer
Start/Run
Undervoltage
Lockout
1.25V
Reference
Error Amp
Latching
PWM
X2
Oscillator
12
7
6
5
4
CSoft–Start
Gnd
Vref 2.5V
RT/CT
Sync/Inhibit
Input
13
14
8
9
10
11
1
2
3
Start/Run
Output
VCC
Vref 1.25V
Noninverting
Input
Inverting
Input
Feedback/
PWM Input
Drive Out
Drive Gnd
Ramp Input
Motorola, Inc. 1996
Rev 1
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