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What is MC34025?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "(MC33025 / MC34025) High Speed Single-Ended PWM Controller".


MC34025 Datasheet PDF - ON Semiconductor

Part Number MC34025
Description (MC33025 / MC34025) High Speed Single-Ended PWM Controller
Manufacturers ON Semiconductor　
Logo ON Semiconductor Logo　


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MC34025, MC33025
High Speed Double−Ended
PWM Controller
The MC34025 series are high speed, fixed frequency, double−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, steering flip−flop, and dual high current totem
pole outputs ideally suited for driving power MOSFETs.
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 Outputs
• Dual High Current Totem Pole Outputs
• 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
• Low Startup Current (500 mA Typ)
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• Internally Trimmed Reference with Undervoltage Lockout
• 45% Maximum Duty Cycle (Externally Adjustable)
• Precision Trimmed Oscillator
• Voltage or Current Mode Operation to 1.0 MHz
• Functionally Similar to the UC3825
• Pb−Free Packages are Available*
16
Vref
4
Clock
5
RT
CT
6
7
Ramp
Error Amp 3
Output
Noninverting 2
Input
Inverting
Input 1
8
Soft−Start
Oscillator
Error
Amp
5.1V
Reference
UVLO
Latching
PWM and
Steering
Flip Flop
Soft−Start
10 Ground
This device contains 227 active transistors.
Figure 1. Simplified Application
15
VCC
13
VC
14
Output B
11
Output A
Power
12 Ground
9
Current
Limit/
Shutdown
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16
1
16
1
MARKING
DIAGRAMS
16
PDIP−16
P SUFFIX
CASE 648
MC3x025P
AWLYYWWG
1
16
SO−16WB
DW SUFFIX
CASE 751G
MC3x025DW
AWLYYWWG
1
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
Error Amp
Inverting Input
Error Amp
Noninverting Input
Error Amp Output
1
2
3
16 Vref
15 VCC
14 Output B
Clock
RT
CT
Ramp
Soft−Start
4 13
5 12
6 11
7 10
89
(Top View)
VC
Power Ground
Output A
Ground
Current Limit/
Shutdown
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 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. 7
1
Publication Order Number:
MC34025/D

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MC34025 equivalent
MC34025, MC33025
0
−5.0
VCC = 15 V
−10
−15
TA = − 55°C
TA = +125°C
TA = + 25°C
−20
−25
−30
0
10 20 30 40
ISource, SOURCE CURRENT (mA)
Figure 8. Reference Voltage Change
versus Source Current
50
66
65.6 VCC = 15 V
65.2
64.8
64.4
64
−55 − 25
0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 9. Reference Short Circuit Current
versus Temperature
Vref LINE REGULATION 10 V − 24 V
2.0 ms/DIV
Figure 10. Reference Line Regulation
Vref LINE REGULATION 1.0 mA − 10 mA
2.0 ms/DIV
Figure 11. Reference Load Regulation
4.0
2.0
0
− 2.0
− 4.0
− 6.0
− 8.0
−10
−12
− 50 − 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 12. Current Limit Comparator Threshold
Change versus Temperature
1.50
1.46 VCC = 15 V
1.42
1.38
1.34
1.30
−55
−25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 13. Shutdown Comparator Threshold
Voltage versus Temperature
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5


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Part Details

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Featured Datasheets

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MC34023The function is (MC33023 / MC34023) High Speed Single-Ended PWM Controller. ON SemiconductorON Semiconductor
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