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CS3842B

Cherry Semiconductor Corporation
Part Number CS3842B
Manufacturer Cherry Semiconductor Corporation
Description Off-Line Current Mode PWM Control Circuit Off-Line Current Mode PWM Control Circuit
Published Mar 23, 2005
Detailed Description CS3842B/3843B CS3842B/CS3843B Off-Line Current Mode PWM Control Circuit with Very Low Start Up Current Description The...
Datasheet PDF File CS3842B PDF File

CS3842B
CS3842B

Overview
CS3842B/3843B CS3842B/CS3843B Off-Line Current Mode PWM Control Circuit with Very Low Start Up Current 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 (300µA, 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% are possible.
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.
Features s Very low Start Up Current (300µA typ) s Optimized Off-line Control s Internally Trimmed, Temperature Compensated Oscillator s Maximum Duty-cycle Clamp s VREF stabilization before Output Enable s Pulse-by-pulse Current Limiting s Improved Undervoltage Lockout s Double Pulse Suppression s 1% Trimmed Bandgap Reference s High Current Totem Pole Output Absolute Maximum Ratings Supply Voltage (ICC<30mA) .
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Self Limiting Supply Voltage (Low Impedance Source).
30V Output Current ±1A Output Energy (Capacitive Load) 5µJ Analog Inputs (VFB, Sense) .
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