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Motorola Electronic Components Datasheet

UC2843A Datasheet

(UC2842A / UC2843A) HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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Order this document by UC3842A/D
High Performance
Current Mode Controllers
The UC3842A, UC3843A series of high performance fixed frequency
current mode controllers 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 a trimmed
oscillator for precise duty cycle control, 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.
Also included are protective features consisting of input and reference
undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting,
programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8–pin dual–in–line 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.
The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off–line converters. The UCX843A is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
Current Mode Operation to 500 kHz
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
Direct Interface with Motorola SENSEFET Products
Vref
8(14)
RTCT
4(7)
Voltage
Feedback
Input
2(3)
Output
Compensation
1(1)
Simplified Block Diagram
VCC 7(12)
R
5.0V
Reference
VCC
Undervoltage
Lockout
R
Vref
Undervoltage
Lockout
Oscillator
+
Error
Amplifier
Latching
PWM
Gnd 5(9)
Pin numbers in parenthesis are for the D suffix SO–14 package.
VC
7(11)
Output
6(10)
Power
Ground
5(8)
Current
Sense
3(5) Input
UC3842A, 43A
UC2842A, 43A
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
N SUFFIX
PLASTIC PACKAGE
CASE 626
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
8
1
14
1
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8 Vref
7 VCC
6 Output
5 Gnd
(Top View)
Compensation 1
NC 2
Voltage Feedback 3
NC 4
Current Sense 5
NC 6
RT/CT 7
14 Vref
13 NC
12 VCC
11 VC
10 Output
9 Gnd
8 Power Ground
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
UC3842AD
SO–14
UC3843AD
UC3842AN
TA = 0° to +70°C
SO–14
Plastic
UC3843AN
Plastic
UC2842AD
SO–14
UC2843AD
TA = – 25° to +85°C
UC2842AN
SO–14
Plastic
UC2843AN
Plastic
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1


Motorola Electronic Components Datasheet

UC2843A Datasheet

(UC2842A / UC2843A) HIGH PERFORMANCE CURRENT MODE CONTROLLERS

No Preview Available !

UC3842A, 43A UC2842A, 43A
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 1)
Output Energy (Capacitive Load per Cycle)
(ICC + IZ)
IO
W
30 mA
1.0 A
5.0 µJ
Current Sense and Voltage Feedback Inputs
Error Amp Output Sink Current
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction–to–Air
N Suffix, Plastic Package
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction–to–Air
Operating Junction Temperature
Operating Ambient Temperature
UC3842A, UC3843A
UC2842A, UC2843A
Vin – 0.3 to + 5.5 V
IO 10 mA
PD
RθJA
PD
RθJA
TJ
TA
862 mW
145 °C/W
1.25
100
+ 150
0 to + 70
– 25 to + 85
W
°C/W
°C
°C
Storage Temperature Range
Tstg – 65 to + 150 °C
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3],
unless otherwise noted.)
UC284XA
UC384XA
Characteristics
Symbol Min Typ Max Min Typ Max
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Vref
4.95 5.0 5.05 4.9
5.0
Line Regulation (VCC = 12 V to 25 V)
Regline
2.0 20
2.0
Load Regulation (IO = 1.0 mA to 20 mA)
Regload
3.0 25
3.0
Temperature Stability
TS
– 0.2 –
– 0.2
Total Output Variation over Line, Load, Temperature
Vref
4.9
5.1 4.82
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)
Vn
– 50 –
– 50
Long Term Stability (TA = 125°C for 1000 Hours)
S
– 5.0 –
– 5.0
Output Short Circuit Current
ISC – 30 – 85 – 180 – 30 – 85
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
fosc
47 52 57 47 52
46 – 60 46 –
Frequency Change with Voltage (VCC = 12 V to 25 V) fosc/V
0.2 1.0
0.2
Frequency Change with Temperature
TA = Tlow to Thigh
fosc/T
5.0
– 5.0
Oscillator Voltage Swing (Peak–to–Peak)
Vosc
– 1.6 –
– 1.6
Discharge Current (Vosc = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh
Idischg
7.5 8.4 9.3 7.5 8.4
7.2 – 9.5 7.2 –
NOTES: 1. Maximum Package power dissipation limits must be observed.
2. Adjust VCC above the Startup threshold before setting to 15 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible
Tlow = –20°C for UC3842A, UC3843A
Tlow = –25°C for UC2842A, UC2843A
Thigh = +70°C for UC3842A, UC3843A
Thigh = +85°C for UC2842A, UC2843A
5.1
20
25
5.18
– 180
57
60
1.0
9.3
9.5
Unit
V
mV
mV
mV/°C
V
µV
mV
mA
kHz
%
%
V
mA
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number UC2843A
Description (UC2842A / UC2843A) HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Maker Motorola
Total Page 14 Pages
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