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MC34025P

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
© Semiconductor Components Industries, LLC, 2012
October, 2012 − Rev. 9
1 Publication Order Number:
MC34025/D
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
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Figure 1. Simplified Application
Error
Amp
Oscillator
4
16
V
ref
Clock
5
6
R
T
C
T
3
7
Ramp
Error Amp
Output
2
Inverting
Input
1
8
Soft-Start
Soft-Start
Latching
PWM and
Steering
Flip Flop
Ground
10
9
Current
Limit/
Shutdown
Output B
14
V
C
13
V
CC
15
UVLO
5.1V
Reference
11
Noninverting
Input
Power
Ground
12
Output A
This device contains 227 active transistors.
PDIP−16
P SUFFIX
CASE 648
1
16
SO−16WB
DW SUFFIX
CASE 751G
1
16
MARKING
DIAGRAMS
PIN CONNECTIONS
1
16
MC3x025P
AWLYYWWG
11
5
2
1
Error Amp
Noninverting Input
Current Limit/
Shutdown
Ground
Output A
Power Ground
V
C
Output B
V
CC
V
ref
9
10
12
13
14
15
16
8
7
6
4
3
(Top View)
Soft-Start
Ramp
C
T
R
T
Clock
Error Amp Output
Error Amp
Inverting Input
http://onsemi.com
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
16
1
MC3x025DW
AWLYYWWG
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION
MC34025, MC33025
http://onsemi.com
2
MAXIMUM RATINGS
Rating Symbol Value Unit
Power Supply Voltage V
CC
30 V
Output Driver Supply Voltage V
C
25 V
Output Current, Source or Sink (Note 1)
DC
Pulsed (0.5 ms)
I
O
0.5
2.0
A
Current Sense, Soft−Start, Ramp, and Error Amp Inputs V
in
−0.3 to +7.0 V
Error Amp Output and Soft−Start Sink Current I
O
10 mA
Clock and R
T
Output Current I
CO
5.0 mA
Power Dissipation and Thermal Characteristics
SO−16 Package (Case 751G)
Maximum Power Dissipation @ T
A
= + 25°C
Thermal Resistance, Junction−to−Air
DIP Package (Case 648)
Maximum Power Dissipation @ T
A
= + 25°C
Thermal Resistance, Junction−to−Air
P
D
R
q
JA
P
D
R
q
JA
862
145
1.25
100
mW
°C/W
W
°C/W
Operating Junction Temperature T
J
+150 °C
Operating Ambient Temperature (Note 2)
MC34025
MC33025
T
A
0 to +70
−40 to +105
°C
Storage Temperature Range T
stg
−55 to +150 °C
Human Body Model ESD Capability per JEDEC − JESD22−A114F HBM 2000 V
Machine Model ESD Capability per JEDEC − JESD22−A115C 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 (V
CC
= 15 V, R
T
= 3.65 kW, C
T
= 1.0 nF, for typical values T
A
= + 25°C, for min/max values T
A
is the operating ambient temperature range that applies [Note 2], unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
REFERENCE SECTION
Reference Output Voltage (I
O
= 1.0 mA, T
J
= + 25°C) V
ref
5.05 5.1 5.15 V
Line Regulation (V
CC
= 10 V to 30 V) Reg
line
− 2.0 15 mV
Load Regulation (I
O
= 1.0 mA to 10 mA) Reg
load
− 2.0 15 mV
Temperature Stability T
S
− 0.2 − mV/°C
Total Output Variation over Line, Load, and Temperature V
ref
4.95 − 5.25 V
Output Noise Voltage (f = 10 Hz to 10 kHz, T
J
= + 25°C) V
n
− 50 −
mV
Long Term Stability (T
A
= +125°C for 1000 Hours) S − 5.0 − mV
Output Short Circuit Current I
SC
−30 −65 −100 mA
OSCILLATOR SECTION
Frequency T
J
= + 25°C
Line (V
CC
= 10 V to 30 V) and Temperature (T
A
= T
low
to T
high
)
f
osc
380
370
400
400
420
430
kHz
Frequency Change with Voltage (V
CC
= 10 V to 30 V)
Df
osc
/DV
− 0.2 1.0 %
Frequency Change with Temperature (T
A
= T
low
to T
high
)
Df
osc
/DT
− 2.0 − %
Sawtooth Peak Voltage V
P
2.6 2.8 3.0 V
Sawtooth Valley Voltage V
V
0.7 1.0 1.25 V
Clock Output Voltage High State
Low State
V
OH
V
OL
3.9
−
4.5
2.3
−
2.9
V
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.
T
low
= 0°C for MC34025 T
high
= +70°C for MC34025
T
low
= − 40°C for MC33025 T
high
= +105°C for MC33025
MC34025, MC33025
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS (V
CC
= 15 V, R
T
= 3.65 kW, C
T
= 1.0 nF, for typical values T
A
= + 25°C, for min/max values
T
A
is the operating ambient temperature range that applies [Note 4], unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
ERROR AMPLIFIER SECTION
Input Offset Voltage
V
IO
− − 15 mV
Input Bias Current I
IB
− 0.6 3.0
mA
Input Offset Current I
IO
− 0.1 1.0
mA
Open−Loop Voltage Gain (V
O
= 1.0 V to 4.0 V) A
VOL
60 95 − dB
Gain Bandwidth Product (T
J
= + 25°C) GBW 4.0 8.3 − MHz
Common Mode Rejection Ratio (V
CM
= 1.5 V to 5.5 V) CMRR 75 95 − dB
Power Supply Rejection Ratio (V
CC
= 10 V to 30 V) PSRR 85 110 − dB
Output Current, Source (V
O
= 4.0 V)
Sink (V
O
= 1.0 V)
I
Source
I
Sink
0.5
1.0
3.0
3.6
−
−
mA
Output Voltage Swing, High State (I
O
= − 0.5 mA)
Low State (I
O
= 1.0 mA)
V
OH
V
OL
4.5
0
4.75
0.4
5.0
1.0
V
Slew Rate SR 6.0 12 −
V/ms
PWM COMPARATOR SECTION
Ramp Input Bias Current
I
IB
− −0.5 −5.0
mA
Duty Cycle of Each Output, Maximum
Minimum
DC
(max)
DC
(min)
40
−
45
−
−
0
%
Zero Duty Cycle Threshold Voltage Pin 3(4) (Pin 7(9) = 0 V) V
th
1.1 1.25 1.4 V
Propagation Delay (Ramp Input to Output, T
J
= + 25°C) t
PLH(in/out)
− 60 100 ns
SOFT−START SECTION
Charge Current (V
Soft−Start
= 0.5 V) I
chg
3.0 9.0 20
mA
Discharge Current (V
Soft−Start
= 1.5 V) I
dischg
1.0 4.0 − mA
CURRENT SENSE SECTION
Input Bias Current (Pin 9(12) = 0 V to 4.0 V)
I
IB
− − 15
mA
Current Limit Comparator Threshold
Shutdown Comparator Threshold
V
th
V
th
0.9
1.25
1.0
1.40
1.10
1.55
V
Propagation Delay (Current Limit/Shutdown to Output, T
J
= + 25°C) t
PLH(in/out)
− 50 80 ns
OUTPUT SECTION
Output Voltage
Low State (I
Sink
= 20 mA)
(I
Sink
= 200 mA)
High State (I
Source
= 20 mA)
(I
Source
= 200 mA)
V
OL
V
OH
−
−
13
12
0.25
1.2
13.5
13
0.4
2.2
−
−
V
Output Voltage with UVLO Activated (V
CC
= 6.0 V, I
Sink
= 0.5 mA) V
OL(UVLO)
− 0.25 1.0 V
Output Leakage Current (V
C
= 20 V) I
L
− 100 500
mA
Output Voltage Rise Time (C
L
= 1.0 nF, T
J
= + 25°C) t
r
− 30 60 ns
Output Voltage Fall Time (C
L
= 1.0 nF, T
J
= + 25°C) t
f
− 30 60 ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold (V
CC
Increasing) V
th(on)
8.8 9.2 9.6 V
UVLO Hysteresis Voltage (V
CC
Decreasing After Turn−On) V
H
0.4 0.8 1.2 V
TOTAL DEVICE
Power Supply Current
Startup (V
CC
= 8.0 V)
Operating
I
CC
−
−
0.5
25
1.2
35
mA
3. Maximum package power dissipation limits must be observed.
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T
low
= 0°C for MC34025 T
high
= +70°C for MC34025
T
low
= − 40°C for MC33025 T
high
= +105°C for MC33025
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MC34025P

Mfr. #:
Buy MC34025P
Manufacturer:
ON Semiconductor
Description:
IC REG CTRLR ISO PWM CM/VM 16DIP
Lifecycle:
New from this manufacturer.
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