Order this document by MC34023/D
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.
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50 ns Propagation Delay to Output
MC34023
MC33023
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
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16
1
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 Start–Up Current (500
µA
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
Error Amp
Inverting Input 1
Error Amp 2
Noninverting Input
Error Amp Output 3
Clock 4
Vref
Clock
RT
CT
16
4
5
6
Oscillator
13
VC
Output
12
Power
Ground
5.1V
Reference
15
VCC
RT 5
CT 6
Ramp 7
Soft–Start 8
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
PIN CONNECTIONS
16 Vref
15 VCC
14 Output
13 VC
12 Power Ground
11 Current Limit
Reference
10 Ground
9 Current Limit/
Shutdown
(Top View)
Simplified Application
UVLO
7
Ramp
Error Amp 3
Output
Noninverting
Input 2
Inverting
Input 1
8
Soft–Start
14
Error
Amp
Latching
PWM
ORDERING INFORMATION
11
Current
9 Limit Ref
Current
Limit/
Shutdown
10
Ground
Soft–Start
Device
MC33023P
MC33023DW
MC34023P
Operating
Temperature Range
TA = – 40° to +105°C
TA = 0° to +70°C
Package
Plastic DIP
SO–16L
Plastic DIP
Rev 2
This device contains 176 active transistors.
©
Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1
MOTOROLA [ MOTOROLA, INC ]
