datasheetbank_Logo    Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site
Part Number :
Home  >>>  UC3842 Datasheet

UC3842

  

Datasheet PDF

Match, Like UC3842 UC3842A UC3842B UC3842D UC3842G UC3842J UC3842N UC3842P UC3842Q UC3842T UC3842W
Start with UC3842A* UC3842B* UC3842D* UC3842G* UC3842J* UC3842N* UC3842P* UC3842Q* UC3842T* UC3842W*
End N/A
Included *CUC3842*

View Details

Manufacturer Part no Description View
Philips
Philips Electronics
UC3842 Current-mode PWM controller

DESCRIPTION
The UC3842 is available in an 8-Pin mini-DIP the necessary features to implement off-line, fixed-frequency current-mode control schemes with a minimal external parts count. This technique results in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting.
Protection circuitry includes built-in undervoltage lock-out and current limiting. Other features include fully-latched operation, a 1% trimmed bandgap reference, and start-up current less than 1mA. These devices feature a totem-pole output designed to source and sink high peak current from a capacitive load, such as the gate of a power MOSFET. Consistent with N-channel power devices, the output is low in the OFF-state.

FEATURES
• Low start-up current (≤1mA)
• Automatic feed-forward compensation
• Pulse-by-pulse current limiting
• Enhanced load response characteristics
• Undervoltage lock-out with hysteresis
• Double pulse suppression
• High current totem-pole output
• Internally-trimmed bandgap reference
• 400kHz operation, guaranteed min

APPLICATIONS
• Off-line switched mode power supplies
• DC-to-DC converters UC3842


other parts : UC3842N  UC3842D  
UC3842 PDF
ST-Microelectronics
STMicroelectronics
UC3842 HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

The UC384xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lock out featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.


other parts : UC2842  UC2842B  UC2842BD1  UC2842BN  UC2843B  UC2843BD1  UC3845BD  UC2843BD101  UC2843BN  UC2844B  
UC3842 PDF
TI
Texas Instruments
UC3842 Current-Mode PWM Controllers

Description
The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

Features
• Optimized for Off-Line and DC-to-DC Converter
• Low Start-Up Current (< 1 mA)
• Automatic Feedforward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load-Response Characteristics
• Undervoltage Lockout With Hysteresis
• Double-Pulse Suppression
• High-Current Totem-Pole Output
• Internally Trimmed Bandgap Reference
• Up to 500-kHz Operation
• Error Amplifier With Low Output Resistance

Applications
• Switching Regulators of Any Polarity
• Transformer-Coupled DC-DC Converters


other parts : 5962-8670401PA  5962-8670401VPA  5962-8670401XA  5962-8670402PA  5962-8670402XA  5962-8670403PA  5962-8670403VXA  5962-8670403XA  5962-8670404DA  5962-8670404PA  
UC3842 PDF
Fairchild
Fairchild Semiconductor
UC3842 SMPS Controller

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.

Features
• Low Start up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency up to 500KHz


other parts : UC3842D  UC3842D1  UC3842N  UC3843  UC3843D  UC3843D1  UC3843N  UC3844  UC3844D  UC3844D1  
UC3842 PDF
Fairchild
Fairchild Semiconductor
UC3842A SMPS Controller

Description
The UC3842A/UC3843A are fixed PWM controller for Off-Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem-pole output for driving a POWER MOSFET. Also UC3842A/ UC3843A provide low start up current below 0.3mA and short shutdown delay time typ. 100ns. The UC3842A has UVLO threshold of 16V(on) and 10V(off). The UC3843A is 8.4V(on) and 7.6V(off). The UC3842A and UC3843A can operate within 100% duty cycle.

Features
• Low Start Current 0.2mA (typ)
• Operating Range Up To 500KHz
• Cycle by Cycle Current Limiting
• Under Voltage Lock Out With Hysteresis
• Short Shutdown Delay Time: typ.100ns
• High Current Totem-pole Output
• Output Swing Limiting: 22V


other parts : 3842A  3842AD  3842ADX  3842AN  3843A  3843AD  3843AN  UC3842AD  UC3842ADX  UC3842AN  
UC3842A PDF
ST-Microelectronics
STMicroelectronics
UC3842A_1999 HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

DESCRIPTION
The UC384xA family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.
Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842A and UC3844A have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843A and UC3845A are 8.5 V and 7.9V. The UC3842A and UC3843A can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844A and UC3845A by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

■ TRIMMED OSCILLATOR DISCHARGE CURRENT
■ CURRENT MODE OPERATION TO 500kHz
■ 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 START-UP CURRENT (< 0.5mA)
■ DOUBLE PULSE SUPPRESSION


other parts : UC2842A_1999  UC2842AD1_1999  UC2843A_1999  UC2843AD1_1999  UC2844A_1999  UC2844AD1_1999  UC2845A_1999  UC2845AD1_1999  UC3842AN_1999  UC3843A_1999  
UC3842A PDF
Microsemi
Microsemi Corporation
UC3842A CURRENT MODE PWM CONTROLER

DESCRIPTION
The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET's, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design.

KEY FEATURES
■ LOW START-UP CURRENT. (0.5mA max.)
■ TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight)
■ OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS.
■ AUTOMATIC FEED FORWARD COMPENSATION.
■ PULSE-BY-PULSE CURRENT LIMITING.
■ ENHANCED LOAD RESPONSE CHARACTERISTICS.
■ UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS.
■ DOUBLE PULSE SUPPRESSION.
■ HIGH-CURRENT TOTEM POLE OUTPUT.
■ INTERNALLY TRIMMED BANDGAP REFERENCE.
■ 500KHz OPERATION.
■ LOW RO ERROR AMPLIFIER.

APPLICATIONS
■ ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS.
■ DC-DC BUCK OR BOOST CONVERTERS.
■ LOW COST DC MOTOR CONTROL.

 


other parts : UC1842A  UC1842AY  UC1842AY-TR  UC1843A  UC1843AY  UC1843AY-TR  UC1844A  UC1844AY  UC1844AY-TR  UC1845A  
UC3842A PDF
Philips
Philips Electronics
UC3842D Current-mode PWM controller

DESCRIPTION
The UC3842 is available in an 8-Pin mini-DIP the necessary features to implement off-line, fixed-frequency current-mode control schemes with a minimal external parts count. This technique results in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting.
Protection circuitry includes built-in undervoltage lock-out and current limiting. Other features include fully-latched operation, a 1% trimmed bandgap reference, and start-up current less than 1mA. These devices feature a totem-pole output designed to source and sink high peak current from a capacitive load, such as the gate of a power MOSFET. Consistent with N-channel power devices, the output is low in the OFF-state.

FEATURES
• Low start-up current (≤1mA)
• Automatic feed-forward compensation
• Pulse-by-pulse current limiting
• Enhanced load response characteristics
• Undervoltage lock-out with hysteresis
• Double pulse suppression
• High current totem-pole output
• Internally-trimmed bandgap reference
• 400kHz operation, guaranteed min

APPLICATIONS
• Off-line switched mode power supplies
• DC-to-DC converters UC3842


other parts : UC3842  UC3842N  
UC3842D PDF
ON-Semiconductor
ON Semiconductor
UC3842A 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
• 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


other parts : 2842  2843  3842  3843  UC2842A  UC2842AD  UC2842ADG  UC2842ADR2  UC2842ADR2G  UC2842AN  
UC3842A PDF
Fci
First Components International
UC3842A Current Mode PWM Controller

DESCRIPTION
The UC3842A-BW/43A-BW/44A-BW/45A-BW are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include 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 circuitry includes built undervoltage lockout and current limiting.

FEATURES
• Low Start-Up and Operating Current
• High Current Totem Pole Output
• Undervoltage Lockout With Hysteresis
• Operating Frequency Up To 500KHz


other parts : UC3842A-BW  UC3843A-BW  UC3844A-BW  UC3845A-BW  UC384XA-BW  
UC3842A PDF
Philips
Philips Electronics
UC3842N Current-mode PWM controller

DESCRIPTION
The UC3842 is available in an 8-Pin mini-DIP the necessary features to implement off-line, fixed-frequency current-mode control schemes with a minimal external parts count. This technique results in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting.
Protection circuitry includes built-in undervoltage lock-out and current limiting. Other features include fully-latched operation, a 1% trimmed bandgap reference, and start-up current less than 1mA. These devices feature a totem-pole output designed to source and sink high peak current from a capacitive load, such as the gate of a power MOSFET. Consistent with N-channel power devices, the output is low in the OFF-state.

FEATURES
• Low start-up current (≤1mA)
• Automatic feed-forward compensation
• Pulse-by-pulse current limiting
• Enhanced load response characteristics
• Undervoltage lock-out with hysteresis
• Double pulse suppression
• High current totem-pole output
• Internally-trimmed bandgap reference
• 400kHz operation, guaranteed min

APPLICATIONS
• Off-line switched mode power supplies
• DC-to-DC converters UC3842


other parts : UC3842  UC3842D  
UC3842N PDF
UTC
Unisonic Technologies
UC3842A_Old_V CURRENT MODE PWM CONTROL CIRCUITS

DESCRIPTION
The UTC UC3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count

FEATURES
* Low external part count.
* Low start up current ( Typical 0.12mA )
* Automatic feed forward compensation
* Pulse-by-Pulse current limiting
* Under-voltage lockout with hysteresis
* Double pulse Suppression
* High current totem pole output to drive MOSFET directly
* Internally trimmed band gap reference
* 500kHz operation


other parts : UC3843A_Old_V  
UC3842A PDF

1

2345678910 Next

New and Popular Datasheet

LM317  PN2222A  1N4007  LM324N  MC74HCT140ASD  IRL3303S  MC705P6ACDWE  KST2907A  M35080FP  MAX11156  FR601S  FR601G  FR601_  FR601  EP1C6Q240C8N  BTS113A  813-SL95.0M-15_07  BUJ303AD  BUJ303AX  BUJ303A  AT24C16D  AT24C164_  MIC4576_98  LF351_08  FR154  IRL3103D2SPBF  IRL3103D1SPBF  IRL3103D1PBF  IRL3103D1S  IKW50N60H3  MJ14000  24C164  UF604G  TSM1051L  TSM1051  TSM1011  TLV320AIC3256  STK672-110-SL-E  STK672-110-E  STK672-110  PFR852S  PFR852  AT24C16N-10SC-2.7  AT24C164-W2.7-11  AT24C16  AME8800AEETY  813-SL95.0M-15  2SK2995  MAX1115  5SLX12K1711  LF251-LF351  IRL3103LPBF  2510-6002UB  3DG122  TDA2030A  Part List  Manufacturers List 
  


Key Word
System  Voltage  Analog  Audio  Axial  Battery  Bipolar  Bridge  Camera  Chip  Clock  Color  Connector  Control  Controller  Converter  Counter  Crystal  Decoder  Digital 

@ 2014 - 2018  [ Home ] [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]