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Motorola Electronic Components Datasheet

MC33025 Datasheet

High Speed Double-Ended PWM Controller

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High Speed Double-Ended
PWM Controller
Order this document by MC34025/D
MC34025
MC33025
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.
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 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 UC3825
16
Vref
4
Clock
5
RT
CT
6
7
Ramp
Error Amp 3
Output
Noninverting 2
Input
Inverting
Input 1
8
Soft–Start
Simplified Application
Oscillator
5.1V
Reference
UVLO
Latching
PWM and
Error
Amp
Steering
Flip Flop
Soft–Star
t
10 Ground
This device contains 227 active transistors.
15
VCC
13
VC
14
Output B
11
Output A
Power
12 Ground
9
Current
Limit/
Shutdown
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
PIN CONNECTIONS
Error Amp
Inverting Input
Error Amp
Noninverting Input
Error Amp Output
1
2
3
16 Vref
15 VCC
14 Output B
Clock 4
RT 5
13 VC
12 Power Ground
CT 6
Ramp 7
Soft–Start 8
11 Output A
10 Ground
9 Current Limit/
Shutdown
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC33025DW
SO–16L
TA = – 40° to +105°C
MC33025P
Plastic DIP
MC34025DW
MC34025P
TA = 0° to +70°C
SO–16L
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1


Motorola Electronic Components Datasheet

MC33025 Datasheet

High Speed Double-Ended PWM Controller

No Preview Available !

MC34025 MC33025
MAXIMUM RATINGS
Rating
Power Supply Voltage
Output Driver Supply Voltage
Output Current, Source or Sink (Note 1)
DC
Pulsed (0.5 µs)
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–16 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)
MC34025
MC33025
Storage Temperature Range
Symbol
VCC
VC
IO
Vin
IO
ICO
PD
RθJA
PD
RθJA
TJ
TA
Tstg
Value
30
20
0.5
2.0
– 0.3 to +7.0
10
5.0
Unit
V
V
A
V
mA
mA
862 mW
145 °C/W
1.25
100
+150
0 to +70
– 40 to +105
– 55 to +150
W
°C/W
°C
°C
°C
ELECTRICAL CHARACTERISTICS (VCC = 15 V, RT = 3.65 k, 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
Frequency
TJ = + 25°C
Line (VCC = 10 V to 30 V) and Temperature (TA = Tlow to Thigh)
Frequency Change with Voltage (VCC = 10 V to 30 V)
Frequency Change with Temperature (TA = Tlow to Thigh)
Sawtooth Peak Voltage
Sawtooth Valley Voltage
Clock Output Voltage
High State
Low State
Vref 5.05 5.1 5.15 V
Regline
2.0 15 mV
Regload
2.0 15 mV
TS – 0.2 – mV/°C
Vref 4.95 – 5.25 V
Vn – 50 – µV
S – 5.0 – mV
ISC
–30
–65
–100
mA
kHz
fosc 380 400 420
370 400 430
fosc/V
fosc/T
VP
VV
VOH
VOL
2.6
0.7
3.9
0.2 1.0 %
2.0 – %
2.8 3.0 V
1.0 1.25 V
V
4.5 –
2.3 2.9
NOTES: 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
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC33025
Description High Speed Double-Ended PWM Controller
Maker Motorola
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MC33025 Datasheet PDF






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