UC384XBD MOTOROLA [Motorola, Inc], UC384XBD Datasheet

no-image

UC384XBD

Manufacturer Part Number
UC384XBD
Description
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.UC384XBD.pdf (16 pages)
High Performance
Current Mode Controllers
current mode controllers. 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, high gain error
amplifier, current sensing comparator, and a high current totem pole output
ideally suited for driving a power MOSFET.
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%.
(SO–8) plastic package as well as the 14–pin plastic surface mount (SO–14).
The SO–14 package has separate power and ground pins for the totem pole
output stage.
suited for off–line converters. The UCX845B is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
MOTOROLA ANALOG IC DEVICE DATA
Compensation
The UC3844B, UC3845B series are high performance fixed frequency
Also included are protective features consisting of input and reference
These devices are available in an 8–pin dual–in–line and surface mount
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
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
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Feedback
Voltage
Output/
R T /C T
Input
V ref
8(14)
4(7)
2(3)
1(1)
Pin numbers in parenthesis are for the D suffix SO–14 package.
Amplifier
Error
R
R
Simplified Block Diagram
Oscillator
Undervoltage
Gnd
Lockout
V ref
5(9)
Reference
5.0V
Latching
PWM
V CC
Undervoltage
Lockout
V CC
7(12)
7(11)
6(10)
5(8)
3(5)
Output
Power
Ground
Current
Sense Input
V C
X indicates either a 4 or 5 to define specific device
part numbers.
UC384XBD
UC384XBD1
UC284XBD
UC284XBD1
UC284XBN
UC384XBVD
UC384XBVD1
UC384XBVN
UC384XBN
Motorola, Inc. 1996
PLASTIC PACKAGE
PLASTIC PACKAGE
Device
PLASTIC PACKAGE
UC3844B, 45B
UC2844B, 45B
Voltage Feedback
Voltage Feedback
CASE 626
N SUFFIX
D1 SUFFIX
CASE 751A
CASE 751
HIGH PERFORMANCE
D SUFFIX
ORDERING INFORMATION
Compensation
Current Sense
Compensation
Current Sense
(SO–14)
(SO–8)
CURRENT MODE
PIN CONNECTIONS
CONTROLLERS
Order this document by UC3844B/D
R T /C T
R T /C T
T A = – 40 to +105 C
Temperature Range
T A = – 25 to + 85 C
NC
NC
NC
T A = 0 to + 70 C
1
2
3
4
1
2
3
4
5
6
7
Operating
(Top View)
(Top View)
8
14
13
12
10
11
8
7
6
5
9
8
14
8
1
V ref
V CC
Output
Gnd
V ref
NC
V CC
V C
Output
Gnd
Power Ground
1
1
Package
SO–14
SO–14
SO–14
Plastic
Plastic
Plastic
SO–8
SO–8
SO–8
Rev 1
1

Related parts for UC384XBD

Image
Part Number
Description
Manufacturer
Datasheet
Request R
MC1723L
Part Number:
MC1723L
Description:
Motorola, Inc [VOLTAGE REGULATOR]
Manufacturer:
Motorola
Datasheet:
MC1723L.pdf (12 pages)
MPQ1000
Part Number:
MPQ1000
Description:
6367254 MOTOROLA SC (XSTRS/R F)
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MPQ1000.pdf (7 pages)
MC1494L
Part Number:
MC1494L
Description:
MC1494LMotorola, Inc [MONOLITHIC FOUR-QUADRANT MULTIPLIER]
Manufacturer:
Motorola
Datasheet:
MC1494L.pdf (14 pages)
MC1466L
Part Number:
MC1466L
Description:
MC1466LMotorola, Inc [PRECISION WIDE RANGE VOLTAGE AND CURRENT REGULATOR]
Manufacturer:
Motorola
Datasheet:
MC1466L.pdf (16 pages)
MC145532DW
Part Number:
MC145532DW
Description:
MC145532DWMotorola, Inc [ADPCM Transcoder]
Manufacturer:
Motorola
Datasheet:
MC145532DW.pdf (16 pages)
MCR704
Part Number:
MCR704
Description:
Silicon Controlled Rectifiers
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MCR704.pdf (4 pages)
MRF21010
Part Number:
MRF21010
Description:
RF Power Field Effect Transistors N-Channel Enhancement-Mode Lateral MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MRF21010.pdf (8 pages)
MRF21125S
Part Number:
MRF21125S
Description:
RF POWER FIELD EFFECT TRANSISTORS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MRF21125S.pdf (12 pages)
MRF282S
Part Number:
MRF282S
Description:
LATERAL N-CHANNEL BROADBAND RF POWER MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MRF282S.pdf (11 pages)
MRF5P20180
Part Number:
MRF5P20180
Description:
RF POWER FIELD EFFECT TRANSISTOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MRF5P20180.pdf (8 pages)
MRF8372R1
Part Number:
MRF8372R1
Description:
RF LOW POWER TRANSISTOR NPN SILICON
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MRF8372R1.pdf (6 pages)
1SMA5921BT3
Part Number:
1SMA5921BT3
Description:
PLASTIC SURFACE MOUNT ZENER DIODES 1.5 WATTS 3.3-68 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
1SMA5921BT3.pdf (6 pages)
MR2835S
Part Number:
MR2835S
Description:
OVERVOLTAGE TRANSIENT SUPPRESSOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MR2835S.pdf (4 pages)
MTD15N06
Part Number:
MTD15N06
Description:
TMOS POWER FET 15 AMPERES 60 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MTD15N06.pdf (10 pages)
MTD20P03
Part Number:
MTD20P03
Description:
TMOS POWER FET LOGIC LEVEL 19 AMPERES 30 VOLTS RDS(on) = 0.099 OHM
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
MTD20P03.pdf (12 pages)

UC384XBD Summary of contents

Page 1

... Error Amplifier Output/ Compensation 1(1) Gnd 5(9) Pin numbers in parenthesis are for the D suffix SO–14 package. MOTOROLA ANALOG IC DEVICE DATA V CC 7(12 Undervoltage Lockout V C UC384XBD 7(11) UC384XBD1 UC384XBN Output 6(10) Latching UC284XBD PWM Power UC284XBD1 Ground 5(8) UC284XBN Current UC384XBVD Sense Input 3(5) UC384XBVD1 UC384XBVN X indicates either define specific device part numbers ...

Page 2

UC3844B, 45B UC2844B, 45B MAXIMUM RATINGS Rating Total Power Supply and Zener Current Output Current, Source or Sink (Note 1) Output Energy (Capacitive Load per Cycle) Current Sense and Voltage Feedback Inputs Error Amp Output Sink Current Power Dissipation and ...

Page 3

UC3844B, 45B UC2844B, 45B ELECTRICAL CHARACTERISTICS ( [Note 2 3.3 nF. For typical values for min/max values the operating ambient ...

Page 4

UC3844B, 45B UC2844B, 45B ELECTRICAL CHARACTERISTICS ( [Note 2 3.3 nF. For typical values for min/max values the operating ambient ...

Page 5

UC3844B, 45B UC2844B, 45B Figure 5. Error Amp Open Loop Gain and Phase versus Frequency 100 2 4 100 k Gain ...

Page 6

UC3844B, 45B UC2844B, 45B Figure 11. Output Saturation Voltage versus Load Current 0 Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Source Saturation (Load to Ground) 80 ...

Page 7

The UC3844B, UC3845B series are high performance, fixed frequency, current mode controllers. They are specifically designed for Off–Line and dc–to–dc converter applications offering the designer a cost–effective solution with minimal external components. A representative block diagram is shown in Figure ...

Page 8

UC3844B, 45B UC2844B, 45B Figure 15. Representative Block Diagram V ref 8(14) R Internal 2.5V Bias Oscillator 4( 1.0mA Voltage Feedback Input 2(3) Error Amplifier Output/ Compensation 1(1) Pin numbers adjacent to terminals are ...

Page 9

Undervoltage Lockout Two undervoltage lockout comparators have been incorporated to guarantee that the IC is fully functional before the output stage is enabled. The positive power supply terminal ( and the reference output (V ref ) are each ...

Page 10

Figure 19. Adjustable Reduction of Clamp Level 5.0V Ref 8(14) R Bias R + – Osc 4( Clamp + 1 2(3) R Comp/Latch 1.0V 1( 5(9) 1.67 R ...

Page 11

UC3844B, 45B UC2844B, 45B Figure 23. Current Waveform Spike Suppression 5.0V Ref + – Figure 24. MOSFET Parasitic Oscillations V CC 7(12) 5.0V Ref + – + 7(11) – 6(10 5(8) Comp/Latch 3(5) Series ...

Page 12

UC3844B, 45B UC2844B, 45B 5.0V Ref + – Comp/Latch MCR 101 The MCR101 SCR must be selected for a holding of < 0 A(min) . The simple two transistor circuit can be used in place ...

Page 13

UC3844B, 45B UC2844B, 45B Figure 29 Off–Line Flyback Regulator 4.7 MDA 202 115 Vac 0.01 8(14) R Bias 33k R Osc 4(7) 1.0nF + 18k 2(3) 100 EA 150k pF 4.7k 1(1) T1 – Primary: 45 Turns #26 ...

Page 14

UC3844B, 45B UC2844B, 45B Figure 30. Step–Up Charge Pump Converter UC3845B 8(14) R 2.5V Internal 10k Bias R 3.6V Osc 4(7) 1.0nF + 0.5mA 2R 2(3) 1.0V R Error Amplifier 1(1) 5(9) The capacitor’s equivalent series resistance must limit the ...

Page 15

UC3844B, 45B UC2844B, 45B –A– NOTE 2 –T– N SEATING PLANE 0.13 (0.005) –A– –B– SEATING –T– PLANE 0.25 (0.010) T ...

Page 16

UC3844B, 45B UC2844B, 45B –A– –B– –T– SEATING 14 PL PLANE 0.25 (0.010 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no ...

Related keywords