Document
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
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16 1
16 1
PDIP−16 P SUFFIX CASE 648
SOIC−16W DW SUFFIX CASE 751G
MARKING DIAGRAMS
16
16 MC34023P
AWLYYWWG
1
MC33023DW AWLYYWWG
1
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb−Free Package
PIN CONNECTIONS
16 Vref
4 Clock
5 RT
6 CT
7 Ramp
Error Amp 3
Output
Noninverting Input
2
Inverting Input
1
8 Soft-Start
Oscillator
5.1V Reference
UVLO
Latching
Error
PWM
Amp
Soft-Start
10 Ground This device contains 176 active transistors.
Figure 1. Simplified Application
15 VCC
13 VC
14 Output
12 Power Ground
11
Current
9
Limit Ref Current
Limit/
Shutdown
Error Amp Inverting Input 1
Error Amp Noninverting Input
2
Error Amp Output 3
16 Vref 15 VCC 14 Output
Clock 4 RT 5 CT 6
Ramp 7 Soft-Start 8
13 VC
12 Power Ground 11 Current Limit
Reference 10 Ground 9 Current Limit/
Shutdown
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 2 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, 2009
1
July, 2009 − Rev. 7
Publication Order Number: MC34023/D
MC34023, MC33023
ORDERING INFORMATION Device
MC33023DWG
Package
SOIC−16W (Pb−Free)
Shipping† 47 Units / Rail
MC33023DWR2G
SOIC−16W (Pb−Free)
1000 Units / Reel
MC34023PG
PDIP−16 (Pb−Free)
25 Units / Rail
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
Output Driver Supply Voltage
Output Current, Source or Sink (Note 1) DC Pulsed (0.5 ms)
VCC
30
V
VC
20
V
IO
A
0.5
2.0
Current Sense, Soft−Start, Ramp, and Error Amp Inputs
Error Amp Output and Soft−Start Sink Current
Clock and RT Output Current
Power Dissipation and Thermal Characteristics SO−16L Package (Case 751G) Maximum Power Dissipation @ TA = + 25°C Thermal Resistance, Junction−to−Air DIP Package (Case 648) Maximum Power Dissipation @ TA = + 25°C Thermal Resistance, Junction−to−Air
Operating Junction Temperature
Operating Ambient Temperature (Note 2) MC34023 MC33023
Vin IO ICO
PD RqJA PD RqJA
TJ
TA
−0.3 to +7.0
V
10
mA
5.0
mA
862 145
1.25 100
+150
0 to +70 −40 to +105
mW °C/W
W °C/W
°C °C
Storage Temperature Range
Tstg
−55 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
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MC34023, MC33023
ELECTRICAL CHARACTERISTICS (VCC = 15 V, RT = 3.65 kW, CT = 1.0 nF, for typical values TA = + 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 2], unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
REFERENCE SECTION Reference Output Voltage (IO = 1.0 mA, TJ = + 25°C) Line Regulation (VCC = 10 V to 30 V) Load Regulation (IO = 1.0 mA to 10 mA) Temperature Stability Total Output Variation over Line, Load, and Temperature Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = + 25°C) Long T.