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UC3842AD

Description
Switching Controllers 52kHz 1A Current PWM
CategoryPower/power management    The power supply circuit   
File Size357KB,18 Pages
ManufacturerON Semiconductor
Websitehttp://www.onsemi.cn
Related ProductsFound11parts with similar functions to UC3842AD
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UC3842AD Overview

Switching Controllers 52kHz 1A Current PWM

UC3842AD Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
Parts packaging codeSOIC
package instructionSOP, SOP14,.25
Contacts14
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage11.5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G14
JESD-609 codee0
length8.65 mm
Humidity sensitivity level1
Number of functions1
Number of terminals14
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)240
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.9 mm
Base Number Matches1
UC3842A, UC3843A,
UC2842A, UC2843A
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 (SOIC−14). The SOIC−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).
Features
http://onsemi.com
8
1
PDIP−8
N SUFFIX
CASE 626
14
1
SOIC−14
D SUFFIX
CASE 751A
8
1
SOIC−8
D1 SUFFIX
CASE 751
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
R
T
/C
T
4
(Top View)
8
7
6
5
V
ref
V
CC
Output
GND
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 ON Semiconductor SENSEFET™ Products
Pb−Free Packages are Available
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
R
T
/C
T
1
2
3
4
5
6
7
(Top View)
14 V
ref
13 NC
12 V
CC
11 V
C
10 Output
9
8
GND
Power Ground
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 16 of this data sheet.
©
Semiconductor Components Industries, LLC, 2005
1
November, 2005 − Rev. 8
Publication Order Number:
UC3842A/D

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