DataSheet39.com

What is TD3843A?

This electronic component, produced by the manufacturer "TMC", performs the same function as "(TD3842A - TD3845A) High Performance Current Mode PWM Controllers".


TD3843A Datasheet PDF - TMC

Part Number TD3843A
Description (TD3842A - TD3845A) High Performance Current Mode PWM Controllers
Manufacturers TMC 
Logo TMC Logo 


There is a preview and TD3843A download ( pdf file ) link at the bottom of this page.





Total 7 Pages



Preview 1 page

No Preview Available ! TD3843A datasheet, circuit

www.DataSheet4U.com
TMC
TD3842A / 3843A / 3844A / 3845A
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
DESCRIPTION
The TD3842A / 3843A/384 4A/3845A are fixed frequency current-mode
PWM controller. They are specially designed for Off - Line and DC-to-DC
converter applications with minimum 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 totempole output Ideally
suited for driving a power MOSFET. Protection circuity Includes built in
under-voltage lockout and current limiting. The TD3842A and TD3844A
have UVLO thresholds of 16V (on) and 10V (off) The TD3843A and
TD3845A are 8.4V (on) and 7.6V (off) The TD3842A and TD3843A
can operate within 100% duty cycle.The TD3844A and TD3845A can
operate with 50% duty cycle.
FEATURES
• Low Start Up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency Up To 500KHz
BLOCK DIAGRAM
SOP-8
DIP-8
DataSheet4U.com
DataShee
Note 1: Toggle flip flop us ed only in 3844A and 3845A.
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8
7
6
5
Top View
Vref
VCC
Output
Gnd
DataSheet4U.com
DataSheet4 U .com
1

line_dark_gray
TD3843A equivalent
www.DataSheet4U.com
OSCILLATOR SECTION
8
4
5
TD3842A / 3843A / 3844A / 3845A
Large RT
Small CT
RT
CT
Small RT
Large CT
V4
INTERNAL
CLOCK
V4
INTERNAL
CLOCK
et4U.com
100
td (µs)
10
1
0.1
1
Dead time VS CT(RT>5k) Timing Resistance Vs Frequency
10 100
CT (nF)
100
RT (k)
10
1
10 2
CT=1nF
CT=2.2nF
CT=4.7nF
CT=10nF
CT=22nF
CT=47nF
CT=100nF
103 104 105
Frequency (Hz)
10 6
TYPICAL PERFORMANCE CHARACTERISTICS
4 DataSheet4U.co1m00
Vcc=15V
3 Ta=+25°C
Ta=-55°C
80
60
2 40
0
-45
-90
1
0
0.01
0.1
Output Current
(Sourse or Sink Current) (A)
1
Output Saturation Characteristics
20 -135
0 -180
10 102 103 104 105 106 107
Frequency (Hz)
Error Amplifier Open-Loop Frequency Response
Shutdown TD3842A can be accomplished by
two methods; either raise pin 3 above 1V or pull
Pin 1 below a voltage two diode drops above
ground. Either method caused the output of PWM
comparator to be high(refer to block diagram) .
The PWM latch is reset dominant so that the
output will remain low until the next clock cycle
after the shutdown condition at pins 1 and/or 3
is removed. In on e example, an externally latched
shut –down may be accomplished by adding an
SCR which be reset by cycling Vcc below the
lower UVLO threshold.AAt this point the reference
turns off allowing the SCR to reset.
SHUTDOWN TECHNIQUES
1k
8
Shutdown
Shutdown
3
To current
Sense resistor
1
DataShee
TMC
DataSheet4U.com
5
DataSheet 4 U .com


line_dark_gray

Preview 5 Page


Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for TD3843A electronic component.


Information Total 7 Pages
Link URL [ Copy URL to Clipboard ]
Download [ TD3843A.PDF Datasheet ]

Share Link :

Electronic Components Distributor


An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists.


SparkFun Electronics Allied Electronics DigiKey Electronics Arrow Electronics
Mouser Electronics Adafruit Newark Chip One Stop


Featured Datasheets

Part NumberDescriptionMFRS
TD3843AThe function is (TD3842A - TD3845A) High Performance Current Mode PWM Controllers. TMCTMC

Semiconductors commonly used in industry:

1N4148   |   BAW56   |   1N5400   |   NE555   |  

LM324   |   BC327   |   IRF840  |   2N3904   |  



Quick jump to:

TD38     1N4     2N2     2SA     2SC     74H     BC     HCF     IRF     KA    

LA     LM     MC     NE     ST     STK     TDA     TL     UA    



Privacy Policy   |    Contact Us     |    New    |    Search