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MC33129 데이터시트 PDF




Motorola Semiconductors에서 제조한 전자 부품 MC33129은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 MC33129 자료 제공

부품번호 MC33129 기능
기능 (MC33129 / MC34129) High Performance Current Mode Controller
제조업체 Motorola Semiconductors
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MC33129 데이터시트, 핀배열, 회로
Order this document by MC34129/D
High Performance
Current Mode Controllers
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
MC34129www.DataSheet4U.com
MC33129
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
14
1
P SUFFIX
PLASTIC PACKAGE
CASE 646
14
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
PIN CONNECTIONS
CSoft–Start 12
7
Gnd
6
Vref 2.5V
5
RT/CT
Sync/Inhibit 4
Input
Simplified Block Diagram
Soft–Start
and
Fault Timer
Start/Run
13 Start/Run
Output
Undervoltage 14
Lockout
VCC
1.25V
Reference
8
Vref 1.25V
X2
Oscillator
Latching
PWM
Error Amp
9
+
10
Noninverting
Input
Inverting
11
Input
Feedback/
1 PWM Input
Drive Out
2
Drive Gnd
3
Ramp Input
Drive Output 1
Drive Ground 2
Ramp Input 3
Sync/Inhibit
Input
4
RT/CT 5
Vref 2.5 V 6
Gnd 7
14 VCC
13 Start/Run Output
12 CSoft–Start
Feedback/
11 PWM Input
10
Error Amp
Inverting Input
9 Error Amp
Noninverting Input
8 Vref 1.25 V
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34129D
MC34129P
TA = 0° to +70°C
SO–14
Plastic DIP
MC33129D
TA = – 40° to +85°C
MC33129P
SO–14
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1




MC33129 pdf, 반도체, 판매, 대치품
MC34129 MC33129
Figure 1. Timing Resistor versus
Oscillator Frequency
1.0 M
500 k
VCC = 10 V
TA = 25°C
200 k
100 k
50 k
Figure 2. Output Dewadwtwim.DeavtaeSrshueest4U.com
Oscillator Frequency
100
50 CT = 5.0 nF
2.0 nF 1.0 nF 500 pF 200 pF
100 pF
20
5.0
20 k
10 k CT = 5.0 nF
5.0 10
2.0 nF
20
1.0 nF 500 pF 200 pF 100pF
50 100 200
fOSC, OSCILLATOR FREQUENCY (kHz)
500
2.0
1.0
5.0
VCC = 10 V
TA = 25°C
10 20
50 100 200
fOSC, OSCILLATOR FREQUENCY (kHz)
500
Figure 3. Oscillator Frequency Change
versus Temperature
8.0 VCC = 10 V
RT = 25.5 k
CT = 390 pF
4.0
0
–4.0
–8.0
–55
–25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
125
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
60 0
VCC = 10 V
VO = 1.25 V
40
Gain
RL =
TA = 25°C
45
20 Phase
90
0 135
–20
1.0 k
10 k
100 k
1.0 M
f, FREQUENCY (Hz)
180
10 M
1.05 V
Figure 5. Error Amp Small–Signal
Transient Response
TA = 25°C
1.0 V
0.95 V
0.5 µs/DIV
4
Figure 6. Error Amp Large–Signal
Transient Response
TA = 25°C
1.5 V
1.0 V
0.5 V
1.0 µs/DIV
MOTOROLA ANALOG IC DEVICE DATA

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MC33129 전자부품, 판매, 대치품
MC34129 MC33129
PIN FUNCTION DESCRIPTION
Pin Function
Description
www.DataSheet4U.com
1 Drive Output
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are
sourced and sinked by this pin.
2 Drive Ground
This pin is a separate power ground return that is connected back to the power source. It is
used to reduce the effects of switching transient noise on the control circuitry.
3 Ramp Input
A voltage proportional to the inductor current is connected to this input. The PWM uses this
information to terminate output switch conduction.
4 Sync/Inhibit Input
A rectangular waveform applied to this input will synchronize the Oscillator and limit the
maximum Drive Output duty cycle. A dc voltage within the range of 2.0 V to VCC will inhibit
the controller.
5 RT/CT
The free–running Oscillator frequency and maximum Drive Output duty cycle are
programmed by connecting resistor RT to Vref 2.5 V and capacitor CT to Ground. Operation
to 300 kHz is possible.
6 Vref 2.50 V
7 Ground
This output is derived from Vref 1.25 V. It provides charging current for capacitor CT through
resistor RT.
This pin is the control circuitry ground return and is connected back to the source ground.
8 Vref 1.25 V
This output furnishes a voltage reference for the Error Amplifier noninverting input.
9 Error Amp Noninverting Input This is the noninverting input of the Error Amplifier. It is normally connected to the 1.25 V
reference.
10 Error Amp Inverting Input
This is the inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
11 Feedback/PWM Input
This pin is available for loop compensation. It is connected to the Error Amplifier and
Soft–Start Buffer outputs, and the Pulse Width Modulator input.
12 CSoft–Start
A capacitor CSoft–Start is connected from this pin to Ground for a controlled ramp–up of peak
inductor current during startup.
13 Start/Run Output
This output controls the state of an external bootstrap transistor. During the start mode,
operating bias is supplied by the transistor from Vin. In the run mode, the transistor is
switched off and bias is supplied by an auxiliary power transformer winding.
14 VCC
This pin is the positive supply of the control IC. The controller is functional over a minimum
VCC range of 4.2 V to 12 V.
MOTOROLA ANALOG IC DEVICE DATA
7

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