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MC34025DW View Datasheet(PDF) - ON Semiconductor

Part Name
Description
Manufacturer
MC34025DW
ON-Semiconductor
ON Semiconductor ON-Semiconductor
MC34025DW Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
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*
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
http://onsemi.com
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 1
Error Amp 2
Noninverting Input
Error Amp Output 3
16 Vref
15 VCC
14 Output B
Clock
RT
CT
Ramp
Soft−Start
4
13
5
12
6
11
7
10
8
9
(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
1
October, 2005 − Rev. 7
Publication Order Number:
MC34025/D
 

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