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© Semiconductor Components Industries, LLC, 2005
October, 2005 − Rev. 7
1
Publication Order Number:
MC34025/D
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)
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*
Figure 1. Simplified Application
Error
Amp
Oscillator
4
16
Vref
Clock
5
6
RT
CT
3
7
Ramp
Error Amp
Output
2
Inverting
Input 1
8
Soft−Start
Soft−Start
Latching
PWM and
Steering
Flip Flop
Ground
10
9
Current
Limit/
Shutdown
Output B
14
VC
13
VCC
15
UVLO
5.1V
Reference
11
Noninverting
Input
Power
Ground
12
Output A
This device contains 227 active transistors.
PDIP−16
P SUFFIX
CASE 648
1
16
SO−16WB
DW SUFFIX
CASE 751G
1
16
MARKING
DIAGRAMS
PIN CONNECTIONS
1
16
MC3x025P
AWLYYWWG
11
5
2
1
Error Amp
Noninverting Input
Current Limit/
Shutdown
Ground
Output A
Power Ground
VC
Output B
VCC
Vref
9
10
12
13
14
15
16
8
7
6
4
3
(Top View)
Soft−Start
Ramp
CT
RT
Clock
Error Amp Output
Error Amp
Inverting Input
http://onsemi.com
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
16
1
MC3x025DW
AWLYYWWG
x
= 3 or 4
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb−Free Package
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION


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