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UC3843BVD Scheda tecnica(PDF) 1 Page - Motorola, Inc

Il numero della parte UC3843BVD
Spiegazioni elettronici  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Produttore elettronici  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC3843BVD Scheda tecnica(HTML) 1 Page - Motorola, Inc

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UC3842B, 43B
UC2842B, 43B
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
Order this document by UC3842B/D
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
N SUFFIX
PLASTIC PACKAGE
CASE 626
D1 SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
8
1
8
1
14
1
Device
Operating
Temperature Range
Package
ORDERING INFORMATION
UC384XBD
UC384XBD1
TA = 0° to +70°C
TA = – 25° to +85°C
SO–14
UC384XBN
UC284XBD
UC284XBD1
UC284XBN
UC384XBVD
UC384XBVD1
UC384XBVN
TA = – 40° to +105°C
SO–8
Plastic
SO–14
SO–8
Plastic
SO–14
SO–8
Plastic
PIN CONNECTIONS
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
RT/CT
Compensation
Voltage Feedback
Current Sense
RT/CT
Vref
Vref
NC
VCC
VC
Output
Gnd
Power Ground
VCC
Output
Gnd
(Top View)
8
7
6
5
1
2
3
4
1
2
3
4
14
13
12
11
5
6
7
10
9
8
(Top View)
X indicates either a 2 or 3 to define specific device part
numbers.
1
MOTOROLA ANALOG IC DEVICE DATA
High Performance
Current Mode Controllers
The UC3842B, UC3843B 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. 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 and surface mount
(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.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off–line converters. The UCX843B is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
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
Simplified Block Diagram
5.0V
Reference
Latching
PWM
VCC
Undervoltage
Lockout
Oscillator
Error
Amplifier
7(12)
VC
7(11)
Output
6(10)
Power
Ground
5(8)
3(5)
Current
Sense
Input
Vref
8(14)
4(7)
2(3)
1(1)
Gnd
5(9)
RT/CT
Voltage
Feedback
Input
R
R
+
Vref
Undervoltage
Lockout
Output
Compensation
Pin numbers in parenthesis are for the D suffix SO–14 package.
VCC
© Motorola, Inc. 1996
Rev 1


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