FAN7585SN Fairchild Semiconductor, FAN7585SN Datasheet

FAN7585SN

Manufacturer Part Number

FAN7585SN

Description

IC PWM INTELL VOLT MODE 24SDIP

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN7585SN.pdf (16 pages)

Specifications of FAN7585SN

Pwm Type

Voltage Mode

Frequency - Max

9.4kHz

Duty Cycle

50%

Voltage - Supply

15 V ~ 30 V

Buck

Boost

Flyback

Inverting

Doubler

Divider

Cuk

Isolated

Operating Temperature

-25°C ~ 85°C

Package / Case

24-SDIP (0.300", 7.62mm)

Frequency-max

9.4kHz

Number Of Outputs

Dual Output

Topology

Push-Pull

Output Voltage

40 V

Output Current

200 mA

Switching Frequency

9.4 KHz

Operating Supply Voltage

6.3 V

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 25 C

Fall Time

50 ns

Mounting Style

Through Hole

Rise Time

100 ns

Synchronous Pin

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Number Of Outputs

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 16
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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 Voltage 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

• Power Good Signal Generator with Hysteresis

Typical Application

• PC Power Supply

FAN7585

Intelligent Voltage Mode PWM IC

24-SDIP

Input

Description

The 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) Section

It 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) Section

It 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) Section

It 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 Section

The 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 Section

The reference voltage is trimmed to ±2%.

(4.9V ≤ Vref ≤ 5.1V)

PG (Power Good Signal Generator) Section

The 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.

www.fairchildsemi.com

Rev. 1.0.0

Related parts for FAN7585SN

FAN7585SN Summary of contents

Page 1

... Power Good Signal Generator with Hysteresis Typical Application • PC Power Supply 24-SDIP 1 ©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com Description The 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) ...

Page 2

FAN7585 Internal Block Diagram OSCILLATOR T T COMP 2 E/A(-) 3 E/A(+) 4 1.25V DTC 21 INTERNAL BIAS Vref 12 Vref Start Up Vcc DET 9 COMP2 PWM CONTROL CK ...

Page 3

Pin Definition C1 GND Vcc COMP E/A(-) E/A(+) T Pin Description Pin Pin I/O Pin Function Description Number Name Supply Voltage CC 2 COMP O E/A Output 3 E/A(-) I E/A (-) Input ...

Page 4

FAN7585 Pin Function Pin Number Pin Name 1 V Supply voltage. Operating range is 15V~30V. Test condition : V CC Error amplifier output connected to non-inverting input of pulse width modulator 2 COMP comparator. 3 E/A(-) Error amplifier ...

Page 5

Absolute Maximum Ratings Characteristics Supply Voltage Collector Output Voltage Collector Output Current Power Dissipation (FAN7585) Operating Temperature Range Storage Temperature Range Temperature Characteristics Characteristics Temperature Coefficient of Vref (-25°C ≤ Ta ≤ 85°C) Symbol Value ...

Page 6

FAN7585 Electrical Characteristics (V =20V, T =25°C, unless otherwise specified Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation Temperature Coefficient of Vref Short Circuit Output Current OSCILLATOR SECTION Oscillation Frequency Frequency Change with Temperature DEAD TIME ...

Page 7

Electrical Characteristics (V =20V, T =25°C, unless otherwise specified Parameter PROTECTION SECTION Over Voltage Protection for +3.3V Over Voltage Protection for +5V Over Voltage Protection for +12V Input Threshold Voltage for PT Under Voltage Protection for +3.3V Under ...

Page 8

FAN7585 Application Informations 100 10 1 0.2 2 Rt/Ct Feedback Dead-time control Output Q1 Output Q2 8 Timing Resistance vs Frequency CT=1nF CT=2.2nF CT=4.7nF CT=10nF CT=20nF CT=50nF CT=100nF ...

Page 9

OVP Block Vo R101 PT D R102 The OVP function is simply realized by connecting Pin14, Pin16, Pin18 to each secondary outputs. R1, R2, R3, R4, R5, R6 are internal resistors of the IC. Each OVP level is determined ...

Page 10

FAN7585 2. UVP Block The block is made comparator with three detecting inputs and without hysteresis voltage. Each UVP level is determined by resistor ratio and the typical values are 2.3V/4.0V/10V respectively. • UVP detecting voltage for ...

Page 11

OCP Block Sense Inductor Equivalent Resistor(Rs) ≅ 5mΩ Io (Offset Voltage Resistor) It also has OCP function for +3.3V,+5V,+12V outputs. The block is made up of three comparators. Pin17(IS12), pin15(IS5) and pin13(IS33) are current sense inputs for +12V, +5V ...

Page 12

FAN7585 4. Remote On/Off & Delay Block 5V Rpull 1.25V 6 REM Remote On/Off Remote On/Off section is controlled by a microprocessor high signal is supplied to the Remote On/Off input(Pin6), the output of COMP6 becomes high status. ...

Page 13

Power Good Signal Generator Vcc 60kΩ DET 9 R12 4.7kΩ Power Good Signal Generator circuit generates "ON or OFF" signal depending on the status of output voltage to prevent the malfunctions of following systems like microprocessor, etc. caused by ...

Page 14

FAN7585 Typical Application Circuit FAN7585 1 Vcc C1 2 COMP GND 3 EA(-) C2 C22 4 EA(+) DTC C21 PSON REM(PSON) PT C20 7 Rt/Ct V12 R47 8 RI IS12 9 DET V5 C19 ...

Page 15

Mechanical Dimensions Package Dimensions in millimeters 24-SDIP FAN7585 15 ...

Page 16

... FAN7585 24-SDIP DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...

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