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  ON Semiconductor Electronic Components Datasheet  

MC33025 Datasheet

High Speed Single-Ended PWM Controller

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MC34025, MC33025
High Speed Double-Ended
PWM Controller
The MC34025 series are high speed, fixed frequency, doubleended
pulse width modulator controllers optimized for high frequency
operation. They are specifically designed for OffLine and
DCtoDC 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 flipflop, 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, cyclebycycle
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
FullyLatched Logic with Double Pulse Suppression
Latching PWM for CycleByCycle Current Limiting
SoftStart 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
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
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
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16
1
16
1
PDIP16
P SUFFIX
CASE 648
MARKING
DIAGRAMS
16
MC3x025P
AWLYYWWG
1
16
SO16WB
DW SUFFIX
CASE 751G
MC3x025DW
AWLYYWWG
1
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = PbFree Package
PIN CONNECTIONS
Error Amp
Inverting Input
Error Amp
Noninverting Input
Error Amp Output
1
2
3
16 Vref
15 VCC
14 Output B
Clock
RT
CT
Ramp
Soft-Start
4 13 VC
5 12 Power Ground
6 11 Output A
7 10 Ground
8 9 Current Limit/
Shutdown
(Top View)
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 PbFree strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2012
October, 2012 Rev. 9
1
Publication Order Number:
MC34025/D


  ON Semiconductor Electronic Components Datasheet  

MC33025 Datasheet

High Speed Single-Ended PWM Controller

No Preview Available !

MC34025, MC33025
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 25 V
IO A
0.5
2.0
Current Sense, SoftStart, Ramp, and Error Amp Inputs
Error Amp Output and SoftStart Sink Current
Clock and RT Output Current
Power Dissipation and Thermal Characteristics
SO16 Package (Case 751G)
Maximum Power Dissipation @ TA = + 25°C
Thermal Resistance, JunctiontoAir
DIP Package (Case 648)
Maximum Power Dissipation @ TA = + 25°C
Thermal Resistance, JunctiontoAir
Operating Junction Temperature
Operating Ambient Temperature (Note 2)
MC34025
MC33025
Vin
IO
ICO
PD
RqJA
PD
RqJA
TJ
TA
0.3 to +7.0
10
5.0
862
145
1.25
100
+150
0 to +70
40 to +105
V
mA
mA
mW
°C/W
W
°C/W
°C
°C
Storage Temperature Range
Human Body Model ESD Capability per JEDEC JESD22A114F
Tstg
HBM
55 to +150
2000
°C
V
Machine Model ESD Capability per JEDEC JESD22A115C
MM 200 V
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.
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 Term Stability (TA = +125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Vref
Regline
Regload
TS
Vref
Vn
S
ISC
5.05
4.95
30
5.1 5.15 V
2.0 15 mV
2.0 15 mV
0.2 mV/°C
5.25 V
50 mV
5.0 mV
65
100
mA
Frequency
TJ = + 25°C
Line (VCC = 10 V to 30 V) and Temperature (TA = Tlow to Thigh)
fosc
380 400 420
370 400 430
Frequency Change with Voltage (VCC = 10 V to 30 V)
Dfosc/DV
0.2 1.0
Frequency Change with Temperature (TA = Tlow to Thigh)
Dfosc/DT
2.0
Sawtooth Peak Voltage
VP 2.6 2.8 3.0
Sawtooth Valley Voltage
VV 0.7 1.0 1.25
Clock Output Voltage
High State
Low State
VOH
VOL
3.9 4.5
2.3 2.9
1. Maximum package power dissipation limits must be observed.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for MC34025
Tlow = 40°C for MC33025
Thigh = +70°C for MC34025
Thigh = +105°C for MC33025
kHz
%
%
V
V
V
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2


Part Number MC33025
Description High Speed Single-Ended PWM Controller
Maker ON Semiconductor
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MC33025 Datasheet PDF





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