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© Semiconductor Components Industries, LLC, 2009
July, 2009 − Rev. 7
1 Publication Order Number:
MC34023/D
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
• 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
• These are Pb−Free Devices
Error
Amp
Oscillator
16
V
ref
Clock
R
T
C
T
Ramp
Error Amp
Output
Inverting
Input
Soft-Start
Soft-Start
Latching
PWM
Ground
10
9
Current
Limit/
Shutdown
Power
Ground
V
C
V
CC
UVLO
5.1V
Reference
Current
Limit Ref
This device contains 176 active transistors.
Output
Noninverting
Input
4
5
6
7
3
2
1
8
15
13
14
11
12
Figure 1. Simplified Application
MARKING DIAGRAMS
1
16
PDIP−16
P SUFFIX
CASE 648
1
16
SOIC−16W
DW SUFFIX
CASE 751G
1
16
MC34023P
AWLYYWWG
MC33023DW
AWLYYWWG
PIN CONNECTIONS
(Top View)
Error Amp
Noninverting Input
Soft-Start
Ramp
C
T
R
T
Clock
Error Amp Output
Error Amp
Inverting Input
Current Limit/
Shutdown
Current Limit
Reference
Power Ground
Output
V
CC
V
ref
11
5
2
1
9
10
12
13
14
15
16
8
7
6
4
3
Ground
V
C
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
ORDERING INFORMATION
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
http://onsemi.com
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G=Pb−Free Package
16
1
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