CS3843B, CS3844, CS3844A Selling Leads, Datasheet
MFG:CRYSTRL Package Cooled:SOP8 D/C:New
CS3843B, CS3844, CS3844A Datasheet download
Part Number: CS3843B
MFG: CRYSTRL
Package Cooled: SOP8
D/C: New
CS3843B, CS3844, CS3844A
- Table of contents:
Info of CS3843B
Info of CS3844
Info of CS3844A
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About CS3843B
PDF/DataSheet Download
Datasheet: CS3843B
File Size: 158364 KB
Manufacturer: CHERRY [Cherry Semiconductor Corporation]
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About CS3844
PDF/DataSheet Download
Datasheet: CS3844
File Size: 83701 KB
Manufacturer: ON SEMICONDUCTOR
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About CS30
PDF/DataSheet Download
Datasheet: CS30
File Size: 58566 KB
Manufacturer: IXYS [IXYS Corporation]
Download : Click here to Download
CS3843B General Description
The CS384XB provides all the necessary features to implement off-line fixed frequency current-mode control with a minimum number of external components. The family has been optimized for very low start up current (300A, typ).
The CS384XB family incorporates a precision temperature-controlled oscillator with an internally trimmed discharge current to minimize variations in frequency. A precision duty-cycle clamp eliminates the need for an external oscillator when a 50% duty-cycle is used. Duty-cycles of almost 100% arepossible. On board logic ensures that VREF is stabilized before the output stage is enabled. Ion-implant resistors provide tighter control of undervoltage lockout.
Other features include pulse-by-pulse current limiting, and a high-current totem pole output for driving capacitive loads, such as the gate of a power MOSFET. The output is LOW in the off state, consistent with N-channel devices.
These ICs are available in 8 and 14 lead surface mount (SO) and 8 lead PDIP packages.
The CS384XB family incorporates a precision temperature-controlled oscillator with an internally trimmed discharge current to minimize variations in frequency. A precision duty-cycle clamp eliminates the need for an external oscillator when a 50% duty-cycle is used. Duty-cycles of almost 100% arepossible. On board logic ensures that VREF is stabilized before the output stage is enabled. Ion-implant resistors provide tighter control of undervoltage lockout.
Other features include pulse-by-pulse current limiting, and a high-current totem pole output for driving capacitive loads, such as the gate of a power MOSFET. The output is LOW in the off state, consistent with N-channel devices.
These ICs are available in 8 and 14 lead surface mount (SO) and 8 lead PDIP packages.
CS3843B Maximum Ratings
Supply Voltage (ICC<30mA)...............................................................................................Self Limiting
Supply Voltage (Low Impedance Source).......................................................................................30V
Output Current .............................................................................................................................±1A
Output Energy (Capacitive Load) ...................................................................................................5J
Analog Inputs (VFB, Sense) ............................................................................................-0.3V to 5.5V
Error Amp Output Sink Current....................................................................................................10mA
Lead Temperature Soldering Wave Solder (through hole styles only) ........10 sec. max, 260°C peak
Reflow (SMD styles only) ......................................................60 sec. max above 183°C, 230°C peak
Supply Voltage (Low Impedance Source).......................................................................................30V
Output Current .............................................................................................................................±1A
Output Energy (Capacitive Load) ...................................................................................................5J
Analog Inputs (VFB, Sense) ............................................................................................-0.3V to 5.5V
Error Amp Output Sink Current....................................................................................................10mA
Lead Temperature Soldering Wave Solder (through hole styles only) ........10 sec. max, 260°C peak
Reflow (SMD styles only) ......................................................60 sec. max above 183°C, 230°C peak
CS3843B Features
`Very low Start Up Current (300A typ)
`Optimized Off-line Control
`Internally Trimmed, Temperature Compensated Oscillator
` Maximum Duty-cycle Clamp
`VREF stabilization before Output Enable
`Pulse-by-pulse Current Limiting
`Improved Undervoltage Lockout
`Double Pulse Suppression
`1% Trimmed Bandgap Reference
`High Current Totem Pole Output
`Optimized Off-line Control
`Internally Trimmed, Temperature Compensated Oscillator
` Maximum Duty-cycle Clamp
`VREF stabilization before Output Enable
`Pulse-by-pulse Current Limiting
`Improved Undervoltage Lockout
`Double Pulse Suppression
`1% Trimmed Bandgap Reference
`High Current Totem Pole Output
CS3844 General Description
The CS3844/45 provides all the necessary features to implement off-line fixed frequency current-mode control with a minimum number of external components.
The CS3844 family incorporates a new precision temperature-controlled oscillator to minimize variations in frequency. An internal toggle flip-flop, which blanks the output every other clock cycle, limits the duty-cycle range to less than 50%. An undervoltage lockout ensures that VREF is stabilized before the output stage is enabled. In the CS2844/CS3844 turn on occurs at 16V and turn off at 10V. In the CS2845/CS3845 turn on is at 8.4V and turn off at 7.6V.
Other features include low start-up current, pulse-by-pulse current limiting, and a high-current totem pole output for driving capacitive loads, such as gate of a power MOSFET. The output is low in the off state, consistent with N-channel devices.
CS3844 Maximum Ratings
Supply Voltage (ICC<30mA)......................................................................... .... Self Limiting
Supply Voltage (Low Impedance Source) ..................................................................... 30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load)......................................................................................5J
Analog Inputs (VFB, VSENSE) ...........................................................................-0.3V to 5.5V
Error Amp Output Sink Current ....................................................................................10mA
Lead Temperature Soldering
Wave Solder (through hole styles only) ......................................10 sec. max, 260°C peak
Reflow (SMD styles only) ....................................60 sec. max above 183°C, 230°C peak
Supply Voltage (Low Impedance Source) ..................................................................... 30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load)......................................................................................5J
Analog Inputs (VFB, VSENSE) ...........................................................................-0.3V to 5.5V
Error Amp Output Sink Current ....................................................................................10mA
Lead Temperature Soldering
Wave Solder (through hole styles only) ......................................10 sec. max, 260°C peak
Reflow (SMD styles only) ....................................60 sec. max above 183°C, 230°C peak
CS3844 Features
· Optimized for Offline Control
· Temp. Compensated Oscillator
· 50% Max Duty-cycle Clamp
· VREF Stabilized before Output Stage is Enabled
· Low Start-up Current
· Pulse-by-pulse Current Limiting
· Improved Undervoltage Lockout
· Double Pulse Suppression
· 1% Trimmed Bandgap Ref.
· High Current Totem Pole Output
· Temp. Compensated Oscillator
· 50% Max Duty-cycle Clamp
· VREF Stabilized before Output Stage is Enabled
· Low Start-up Current
· Pulse-by-pulse Current Limiting
· Improved Undervoltage Lockout
· Double Pulse Suppression
· 1% Trimmed Bandgap Ref.
· High Current Totem Pole Output
CS3844 Connection Diagram
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