MC44602P2 Motorola, MC44602P2 Datasheet

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MC44602P2

Manufacturer Part Number
MC44602P2
Description
Manufacturer
Motorola
Datasheet

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MC44602P2
Manufacturer:
MOTOROLA
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MC44602P2
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Advance Information
High Performance
Current Mode Controller
mode controller that is specifically designed for off–line and high voltage
dc–to–dc converter applications. This device has the unique ability of
changing operating modes if the converter output is overloaded or shorted,
offering the designer additional protection for increased system reliability.
The MC44602 has several distinguishing features when compared to
conventional current mode controllers. These features consist of a foldback
amplifier for overload detection, valid load and demag comparators with a
fault latch for short circuit detection, thermal shutdown, and separate high
current source and sink outputs that are ideally suited for driving a high
voltage bipolar power transistor, such as the MJE18002, MJE18004, or
MJE18006.
compensated reference, high gain error amplifier, and a current sensing
comparator. Protective features consist of input and reference undervoltage
lockouts each with hysteresis, cycle–by–cycle current limiting, a latch for
single pulse metering, and a flip–flop which blanks the output off every other
oscillator cycle, allowing output deadtimes to be programmed from 50% to
70%. This device is manufactured in a 16 pin dual–in–line heat tab package
for improved thermal conduction.
Voltage Feedback–Input
MOTOROLA ANALOG IC DEVICE DATA
Driving Bipolar Power Transistors: 1.0 A Source, 1.5 A Sink
The MC44602 is an enhanced high performance fixed frequency current
Standard features include an oscillator with a sync input, a temperature
Separate High Current Source and Sink Outputs Ideally Suited for
Unique Overload and Short Circuit Protection
Thermal Protection
Oscillator with Sync Input
Current Mode Operation to 500 kHz Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for Cycle–By–Cycle Current Limiting
Input and Reference Undervoltage Lockouts with Hysteresis
Low Startup and Operating Current
Compensation
Sync Input
R T /C T
V ref
16
7
8
1
3
Oscillator
Undervoltage
Amplifier
Lockout
Simplified Block Diagram
V ref
Error
Foldback
Amplifier
Gnd
Reference
Flip Flop
Latching
PWM
and
5.0V
9
Thermal
Short Circuit
Detection
Undervoltage
Lockout
V CC
15
14
11
10
2
6
4, 5, 12, 13
V CC
Load Detect Input
V C
Source Output
Sink Output
Sink Ground
Current Sense Input
MC44602
Motorola, Inc. 1995
Device
Voltage Feedback Input
Current Sense Input
Load Detect Input
HIGH PERFORMANCE
ORDERING INFORMATION
Compensation
Sink Gnd
CURRENT MODE
Sync Input
Temperature Range
MC44602
CONTROLLER
SEMICONDUCTOR
T A = – 25 to 85 C
TECHNICAL DATA
16
Order this document by MC44602/D
PLASTIC PACKAGE
PIN CONNECTIONS
R T /C T
DIP (12 + 2 + 2)
Operating
1
CASE 648C
P2 SUFFIX
1
2
3
4
5
6
7
8
(Top View)
16
15
14
13
12
11
10
9
DIP (12 + 2 + 2)
V ref
V CC
V C
Source Output
Sink Output
Gnd
Sink Gnd
Package
1

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MC44602P2 Summary of contents

Page 1

... Flip Flop 8 and Latching Compensation PWM 1 Error Amplifier Voltage Feedback–Input Foldback 3 Amplifier Gnd 9 MOTOROLA ANALOG IC DEVICE DATA HIGH PERFORMANCE Load Detect Input Voltage Feedback Input V CC Undervoltage V CC Lockout 15 Current Sense Input Short Circuit Load Detect Input Detection Source Output ...

Page 2

... 150 T A –25 to +85 Symbol Min – A VOL 65 BW 1.0 0.8 PSRR 65 I Sink – 1.5 I Source – –2 6 – MOTOROLA ANALOG IC DEVICE DATA Unit C/W C Typ Max Unit 2.5 2.65 V –0.6 –2 – dB MHz 1.4 1.8 – 2.0 70 – ...

Page 3

... Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 4. This parameter is measured at the latch trip point with –5.0 A, refer to Figure 9. 5. Comparator gain is defined Current Sense Input MOTOROLA ANALOG IC DEVICE DATA MC44602 Symbol f OSC f OSC / V ...

Page 4

... C T =200 500 pF Ä Ä Ä Ä 100 pF 65 Ä 60 Ä 1 Ä 500 k 1 OSC , OSCILLATOR FREQUENCY (Hz) MOTOROLA ANALOG IC DEVICE DATA Min Typ Max Unit V – 0.6 0.3 – 1.8 2.0 – 2.1 2.6 – 1.4 1.7 – ...

Page 5

... Phase versus Frequency 100 2 4 100 Gain 60 Phase –20 0 100 k f, FREQUENCY (Hz) MOTOROLA ANALOG IC DEVICE DATA MC44602 Figure 4. Oscillator Voltage Swing 5 OSC = 3.0 V 4.0 Peak Voltage 3.0 2.0 1.0 Valley Voltage 0 75 100 125 –55 – AMBIENT TEMPERATURE ( C) Figure 6. Error Amp Large Signal ...

Page 6

... Figure 14. Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length 100 – D(max) for 150 180 LENGTH OF COPPER (mm) MOTOROLA ANALOG IC DEVICE DATA 125 –55 C 0.4 0.6 0.8 1.0 Line Regulation ref = 100 125 AMBIENT TEMPERATURE ( C) É É É ...

Page 7

... I sink , SINK OUTPUT CURRENT (mA) Figure 19. Supply Current versus Supply Voltage 1 Current Sense = 8 4.0 8 SUPPLY VOLTAGE (V) MOTOROLA ANALOG IC DEVICE DATA MC44602 Figure 16. Output Cross Conduction 2 1 –1.0 A Figure 18. Source Output Saturation Voltage –55 C –0.5 –1.0 –1.5 –2 –2 Pulsed Load 120 Hz Rate – ...

Page 8

... AMBIENT TEMPERATURE ( C) Figure 26. Reference Undervoltage Threshold 3. Decreasing 3.38 3.34 3.30 75 100 125 –55 – AMBIENT TEMPERATURE ( C) MOTOROLA ANALOG IC DEVICE DATA versus Temperature 100 125 versus Temperature V CC Increasing 100 125 versus Temperature V ref Decreasing 0 25 ...

Page 9

... Source Output 2.5V Load Detect 85mV Input 0V Demag Output Fault Latch Q 2.5V Sync Input 0V Startup With Foldback Startup Without Foldback *C = Comparison of Current Sense Input With V Clamp MOTOROLA ANALOG IC DEVICE DATA MC44602 20V Reference Regulator 14V V CC UVLO Reference UVLO 3.6V Load ...

Page 10

... Abnormal operating conditions occur when the power supply output is overloaded or if output voltage sensing is lost. Under these conditions, the Current Sense Comparator threshold will be internally clamped to 1.0 V. Therefore the maximum peak switch current is: l pk(max) MOTOROLA ANALOG IC DEVICE DATA ) + W 1.4 V 8800 ...

Page 11

... The 5.0 V bandgap reference has a tolerance of 6.0% over a junction temperature range of – Its primary purpose is to supply charging current to the oscillator timing capacitor. The reference has short circuit protection MOTOROLA ANALOG IC DEVICE DATA MC44602 and is capable of providing in excess for powering additional control system circuitry. ...

Page 12

... The time constant consists of the output filter capacitance, and the equivalent series resistance (ESR) of the capacitor plus the associated wire resistance. MOTOROLA ANALOG IC DEVICE DATA l pk(max) Low Value R 1 High Value R 1 ...

Page 13

... Load Detect Input failed to exceed 2.5 V. Under these conditions, the Sync input will go high approximately 1.0 s after the Load Detect Input exceeds the 85 mV Demag MOTOROLA ANALOG IC DEVICE DATA MC44602 Fault Latch Sync ...

Page 14

... This pin is the positive supply of the control IC. The minimum operating voltage range after startup This is the 5.0 V reference output. It provides charging current for capacitor C T through resistor R T and can be used to bias any additional system circuitry. MOTOROLA ANALOG IC DEVICE DATA ...

Page 15

... V – 15 Turns, #25AWG (2 Strands) Bifiliar Wound Secondary: 6.8 V – 5 Turns, #25AWG (2 Strands) Bifiliar Wound Core – ETD39 34x17x11 B52 0.020 for a primary inductance of 750 500 nH/Turn 2 Gap – MOTOROLA ANALOG IC DEVICE DATA MC44602 T1 47k MUR 2.0W 4100 270 1N4934 1.0 H ...

Page 16

... Conditions 185 Vac to 265 Vac 220 Vac 220 Vac 117 220 Vac 5.0 W MOTOROLA ANALOG IC DEVICE DATA 220pF 390 220 0.1 155V/0.5A 220pF 470 0.1 24.5V/1.8A 220pF 0.1 15.5V/1.8A 470 1.0nF/1.0kV 4.7M Results = 1 0. ...

Page 17

... NOTE 5 –T– SEATING PLANE 0.13 (0.005 MOTOROLA ANALOG IC DEVICE DATA MC44602 OUTLINE DIMENSIONS P2 SUFFIX PLASTIC PACKAGE CASE 648C–03 ISSUE C 9 –B– 0.13 (0.005 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL ...

Page 18

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...

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