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PDF MC34023 Data sheet ( Hoja de datos )
| Número de pieza | MC34023 | |
| Descripción | (MC33023 / MC34023) High Speed Single-Ended PWM Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC34023, MC33023
High Speed Single−Ended
PWM Controller
The MC34023 series are high speed, fixed frequency, single−ended
pulse width modulator controllers optimized for high frequency
operation. They are specifically designed for Off−Line and
DC−to−DC converter applications offering the designer a
cost−effective solution with minimal external components. These
integrated circuits feature an oscillator, a temperature compensated
reference, a wide bandwidth error amplifier, a high speed current
sensing comparator, and a high current totem pole output ideally
suited for driving a power MOSFET.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle−by−cycle
current limiting, and a latch for single pulse metering.
The flexibility of this series allows it to be easily configured for
either current mode or voltage mode control.
Features
• 50 ns Propagation Delay to Output
• High Current Totem Pole Output
• Wide Bandwidth Error Amplifier
• Fully−Latched Logic with Double Pulse Suppression
• Latching PWM for Cycle−By−Cycle Current Limiting
• Soft−Start Control with Latched Overcurrent Reset
• Input Undervoltage Lockout with Hysteresis
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• Low Startup Current (500 mA Typ)
• Internally Trimmed Reference with Undervoltage Lockout
• 90% Maximum Duty Cycle (Externally Adjustable)
• Precision Trimmed Oscillator
• Voltage or Current Mode Operation to 1.0 MHz
• Functionally Similar to the UC3823
• Pb−Free Packages are Available*
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16
1
16
1
PDIP−16
P SUFFIX
CASE 648
SOIC−16W
DW SUFFIX
CASE 751G
MARKING DIAGRAMS
16
16
MC34023P
AWLYYWWG
1
MC33023DW
AWLYYWWG
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
16
Vref
4
Clock
5
RT
6
CT
7
Ramp
Error Amp 3
Output
Noninverting
Input
2
Inverting
Input
1
8
Soft−Start
Oscillator
5.1V
Reference
UVLO
Latching
Error PWM
Amp
Soft−Start
10 Ground
This device contains 176 active transistors.
Figure 1. Simplified Application
15
VCC
13
VC
14
Output
12
Power
Ground
11
Current
9
Limit Ref
Current
Limit/
Shutdown
Error Amp
Inverting Input
Error Amp
Noninverting Input
Error Amp Output
1
2
3
16 Vref
15 VCC
14 Output
Clock 4
RT 5
CT 6
Ramp 7
Soft−Start 8
13 VC
12 Power Ground
11 Current Limit
Reference
10 Ground
9 Current Limit/
Shutdown
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
October, 2005 − Rev. 6
1
Publication Order Number:
MC34023/D
1 page  
MC34023, MC33023
100 k
1
35 7 9
VCC = 15 V
TA = + 25°C
24
68
CT =
10 k 1. 100 nF
2. 47 nF
3. 22 nF
4. 10 nF
5. 4.7 nF
6. 2.2 nF
1.0 k
7. 1.0 nF
8. 470 pF
9. 220 pF
470100
1000
104
105
106
fosc, OSCILLATOR FREQUENCY (Hz)
107
Figure 2. Timing Resistor versus
Oscillator Frequency
1200 RT = 1.2 k
1.0 MHz CT = 1.0 nF
1000
800
VCC = 15 V
600
400
400 kHz
RT = 3.6 k
CT = 1.0 nF
200
−0 55
50 kHz
RT = 36 k
CT = 1.0 nF
− 25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 3. Oscillator Frequency
versus Temperature
125
120 0
100
80
60
Phase
40
Gain
45
90
20
0 135
− 20 10
100 1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
1.30
1.28
VCC = 15 V
Pin 7(9) = 0 V
1.26
1.24
1.22
1.20
− 55 − 25
0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 5. PWM Comparator Zero Duty Cycle
Threshold Voltage versus Temperature
2.55 V
2.5 V
2.45 V
0.1 ms/DIV
Figure 6. Error Amp Small Signal
Transient Response
3.0 V
2.5 V
2.0 V
0.1 ms/DIV
Figure 7. Error Amp Large Signal
Transient Response
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5
5 Page 
MC34023, MC33023
Pin
DIP/SOIC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Function
Error Amp
Inverting Input
Error Amp
Noninverting
Input
Error Amp
Output
Clock
RT
CT
Ramp Input
Soft−Start
Current Limit/
Shutdown
Ground
Current Limit
Reference Input
Power Ground
VC
Output
VCC
Vref
PIN FUNCTION DESCRIPTION
Description
This pin is usually used for feedback from the output of the power supply.
This pin is used to provide a reference in which an error signal can be produced on the output of the
error amp. Usually this is connected to Vref, however an external reference can also be used.
This pin is provided for compensating the error amp for poles and zeros encountered in the power
supply system, mostly the output LC filter.
This is a bidirectional pin used for synchronization.
The value of RT sets the charge current through timing Capacitor, CT.
In conjunction with RT, the timing Capacitor sets the switching frequency.
For voltage mode operation this pin is connected to CT. For current mode operation this pin is
connected through a filter to the current sensing element.
A capacitor at this pin sets the Soft−Start time.
This pin has two functions. First, it provides cycle−by−cycle current limiting. Second, if the current is
excessive, this pin will reinitiate a Soft−Start cycle.
This pin is the ground for the control circuitry.
This pin voltage sets the threshold for cycle−by−cycle current limiting.
This 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.
This is a separate power source connection for the outputs that is connected back to the power source
input. With a separate power source connection, it can reduce the effects of switching transient noise
on the control circuitry.
This is a high current totem pole output.
This pin is the positive supply of the control IC.
This is a 5.1 V reference. It is usually connected to the noninverting input of the error amplifier.
4
5
CT 6
Oscillator
7 1.25 V
3
1
Output Voltage
Feedback Input Vref
2
In voltage mode operation, the control range on the output of the Error
Amplifier from 0% to 90% duty cycle is from 2.25 V to 4.05 V.
Figure 22. Voltage Mode Operation
4
5
CT 6
Oscillator
From Current
Sense Element
7 1.25 V
3
1
Output Voltage
Feedback Input Vref 2
In current mode control, an RC filter should be placed at the ramp input
to filter the leading edge spike caused by turn−on of a power MOSFET.
Figure 23. Current Mode Operation
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11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MC34023.PDF ] | |
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