UC3843D datasheet, PDF - EEWORLD Datasheet

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UC3843D: DescriptionSwitching Controllers PWM Control IC; CategoryPower/power management The power supply circuit; File Size126KB，12 Pages; ManufacturerFairchild; Websitehttp://www.fairchildsemi.com/; Environmental Compliance; Related ProductsFound18parts with similar functions to UC3843D

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UC3843D Overview

Switching Controllers PWM Control IC

UC3843D Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Fairchild
Parts packaging code	SOIC
package instruction	SOP, SOP14,.25
Contacts	14
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	30 V
Minimum input voltage	12 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G14
JESD-609 code	e3
length	8.56 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	14
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP14,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.8 mm
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	500 kHz
technology	BIPOLAR
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.95 mm

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UC3842/UC3843/UC3844/UC3845

SMPS Controller

Features

•

Low Start up Current

Maximum Duty Clamp

UVLO With Hysteresis

Operating Frequency up to 500KHz

Description

The UC3842/UC3843/UC3844/UC3845 are fixed

frequencycurrent-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 for driving a Power MOSFET. The

UC3842 and UC3844 have UVLO thresholds of 16V (on)

and 10V (off). The UC3843 and UC3845 are 8.5V(on) and

7.9V (off). The UC3842 and UC3843 can operate within

100% duty cycle. The UC3844 and UC3845 can operate

with 50% duty cycle.

8-DIP

8-SOP

14-SOP

Internal Block Diagram

* NORMALLY 8DIP/8SOP PIN NO.

* ( ) IS 14SOP PINNO.

* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845

Rev. 1.0.1

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UC3843D Similar Products

Part Number	Manufacturer	Description
UC3843DTR	Texas Instruments(德州仪器)	Current-Mode PWM Controller 14-SOIC 0 to 70
UC3843DX	Fairchild	SMPS Controller
IP3843D-14	SEMELAB	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, 0.150 INCH, PLASTIC, SOIC-14
IP3843D-14E1	TT Electronics plc	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO14, 0.150 INCH, PLASTIC, SOIC-14
UC3844BD1G	ON Semiconductor(安森美)	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max
UC2845BN	ST(意法半导体)	Current Mode PWM Controller 1A 500kHz 8-Pin PDIP Tube
KA3845B	ON Semiconductor(安森美)	IC REG CTRLR 8DIP
UC2844BDG	ON Semiconductor(安森美)	1A SWITCHING CONTROLLER, 275kHz SWITCHING FREQ-MAX, PDSO14, ROHS COMPLIANT, SOIC-14
UC2844BN	Rochester Electronics	1A SWITCHING CONTROLLER, 275kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8
UC3844BD1R2	ON Semiconductor(安森美)	Switching Controllers 52kHz 1A Current PWM
UC3845DX	Fairchild	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, SOP-14
IP3843AD-8	TT Electronics plc	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, 0.150 INCH, PLASTIC, SOIC-8
IP1845JE1	SEMELAB	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8
IP2843AD-8	SEMELAB	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, 0.150 INCH, PLASTIC, SOIC-8
IP3845AD-14	SEMELAB	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, 0.150 INCH, PLASTIC, SOIC-14
KA3844BD	Fairchild	1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
KA3844BDTF	Fairchild	Switching Controllers SMPS Controller
IP3843J	TT Electronics plc	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CDIP8, CERAMIC, DIP-8

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