Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF


UC3842B Datasheet(PDF) 1 Page - ON Semiconductor

Part No. UC3842B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Download  20 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo 

 
 1 page
background image
© Semiconductor Components Industries, LLC, 2001
December, 2001 – Rev. 3
1
Publication Order Number:
UC3842B/D
UC3842B, UC3843B,
UC2842B, UC2843B,
NCV3843BV
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
Figure 1. 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
http://onsemi.com
14
SO–14
D SUFFIX
CASE 751A
1
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 17 of this data sheet.
DEVICE MARKING INFORMATION
1
8
PDIP–8
N SUFFIX
CASE 626
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)
SO–8
D1 SUFFIX
CASE 751
1
8




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
MC34065-HHIGH PERFORMANCE DUAL CHANNEL CURRENT MODE CONTROLLERS 1 2 3 4 5 MoreON Semiconductor
CS5124High Performance Integrated Current Mode PWM Controllers 1 2 3 4 5 MoreCherry Semiconductor Corporation
UC3842AHIGH PERFORMANCE CURRENT MODE CONTROLLERS 1 2 3 4 5 MoreON Semiconductor
PL384XAQ8High Performance Current Mode PWM Controllers 1 2 3 4 5 MoreCystech Electonics Corp.
UC3844HIGH PERFORMANCE CURRENT MODE CONTROLLERS 1 2 3 4 5 MoreON Semiconductor
PL384XBP8High Performance Current Mode PWM Controllers 1 2 3 4 5 MoreCystech Electonics Corp.
UC3844BHIGH PERFORMANCE CURRENT MODE CONTROLLERS 1 2 3 4 5 MoreON Semiconductor
PL384XBQ8High Performance Current Mode PWM Controllers 1 2 3 4 5 MoreCystech Electonics Corp.
UC3842AHIGH PERFORMANCE CURRENT MODE CONTROLLERS 1 2 3 4 5 MoreMotorola, Inc
UC3842BHIGH PERFORMANCE CURRENT MODE CONTROLLERS 1 2 3 4 5 MoreMotorola, Inc

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl