FAN7585 ,PWM AND SECONDARY COMBO ICFeatures Description Complete PWM Control and House Keeping Circuitry The FAN7585 is a fixed frequ ..
FAN7585SN ,PWM AND SECONDARY COMBO ICFeatures Description Complete PWM Control and House Keeping Circuitry The FAN7585 is a fixed frequ ..
FAN7601 ,GREEN MODE PWM CONTROL ICFeatures Description• Green Current Mode PWM Control The FAN7601 is a green programmable frequency ..
FAN7601B ,Green-Mode PWM Control ICapplications and the auxiliary power Burst Mode Operation supplies that require high efficiency a ..
FAN7601GX ,GREEN MODE PWM CONTROL ICFeatures Description• Green Current Mode PWM Control The FAN7601 is a green programmable frequency ..
FAN7601MX ,GREEN MODE PWM CONTROL ICFeatures Description• Green Current Mode PWM Control The FAN7601 is a green programmable frequency ..
FJY4006R ,PNP Epitaxial Silicon Transistor with Bias ResistorFeatures• Switching circuit, Inverter, Interface circuit, Driver Circuit• Built in bias Resistor (R ..
FJY4007R , PNP Epitaxial Silicon Transistor
FJY4008R , PNP Epitaxial Silicon Transistor
FJY4009R , PNP Epitaxial Silicon Transistor
FJY4010R , PNP Epitaxial Silicon Transistor
FJY4011R , PNP Epitaxial Silicon Transistor
FAN7585-FAN7585SN
PWM AND SECONDARY COMBO IC
©2003
Features Complete PWM Control and House Keeping Circuitry Few External Components Precision Voltage Reference Trimmed to 2% Dual Output for Push-Pull Operation Each Output TR for 200mA Sink Current Variable Duty Cycle by Dead Time Control Soft Start Capability by Using Dead Time Control Double Pulse Suppression Logic Over V oltage Protection for 3.3V/5V/12V Under Voltage Protection for 3.3V/5V/12V Over Current Protection for 3.3V/5V/12V One More External Input for Various Protection (PT) Remote On/Off Control Function (PS-ON) Latch Function Controlled by Remote and Protection
Input Power Good Signal Generator with Hysteresis
Typical Application PC Power Supply
DescriptionThe FAN7585 is a fixed frequency improved performance
pulse width modulation control circuit with complete house-
keeping circuitry for use in the secondary side of SMPS
(Switched Mode Power Supply). It contains various func-
tions, which are overvoltage protection, undervoltage protec-
tion, over current protection, remote on/off control, power
good signal generator, etc.
OVP (Over Voltage Protection) SectionIt has OVP functions for +3.3V,+5V,+12V outputs and PT.
The circuit is made up of a comparator with four detecting
inputs and without hysteresis voltage. Especially, PT (Pin19)
is prepared for an extra OVP input or another protection
signal.
UVP (Under Voltage Protection) SectionIt also has UVP functions for +3.3V, +5V, +12V outputs. The
block is made up of a comparator with three detecting inputs
and without hysteresis voltage.
OCP (Over Current Protection) SectionIt has precision OCP functions for +3.3V, +5V, +12V out-
puts. The block is made up of three comparators with current
source setting function. Two inputs of each OCP comparator
are connected to both sides of current sensing inductor that is
located in the secondary output of SMPS.
Remote On/Off SectionThe remote on/off section is used to control SMPS exter-
nally. If a high signal or open state is supplied to the remote
on/off input, PWM signal becomes a high state and all sec-
ondary outputs are grounded. The remote on/off signal is
transferred with some on-delay and off-delay time of 8ms,
24ms respectively.
Precision Reference SectionThe reference voltage is trimmed to ±2%.
(4.9V ≤ Vref ≤ 5.1V)
PG (Power Good Signal Generator) SectionThe power good signal generator is to monitor the voltage
level of power supply for safe operation of a microprocessor
having some delay time at turn-on. The power good output
should be low state before the output voltatge is out of regu-
lation at turn-off.
