Fairchild Semiconductor FSDH565 Datasheet

FSDH565

Fairchild Power Switch(FPS)

www.fairchildsemi.com

Features

• Single Chip 650V 0.5A SenseFET Power Switch

• Precision Fixed Operating Frequency (100kHz)

• Internal Start up Switch

• UVLO with Hysteresis (6.7V/8.7V)

• Over Load Protection

• Over Current Protection (0.3A)

• Internal Thermal Shutdown Function

• Secondary Side Regulation

• Auto-restart mode

• No load consumption <250mW at 265VAC input

Applications

• Charger & Adaptor for Mobile Phone, PDA & MP3

• Auxiliary Power for PC, C-TV, Monitor

Description

The FSDH565 is specially designed for an off-line SMPS with
minimal external components. The FSDH565 is a monolithic
high voltage power switching regulator that combine the
SenseFET(LDMOS) with voltage mode PWM control block.
Included PWM controller features integrated fixed oscillator,
under voltage lock out, leading edge blanking, optimized gate
turn-on/turn-off driver, therma l shut down protection and
temperature compensated precision current sources for loop
compensation and fault protection circuitry. compared to
discrete MOSFET and controller or R
solution, a FSDH565 can reduce total component count, design
size, weight and at t he same time in crea se efficiency,
productivity, and system reliability. It has a basic platform well
suited for cost effective design in a flyback converter.

8-DIPH

1

1.Vstr 2.Vfb 3.4.5.6.G N D 7. V cc 8.D ra i n

switching converter

CC

Internal Block Diagram

#7 : Vcc

#7 : Vcc

UVLO

UVLO

VREG(5.8V)

VREG(5.8V)

5 uA

5 uA

#2 : Vfb

#2 : Vfb

OLP

OLP

+

+_+
_

_

4.5V

4.5V

©2001 Fairchild Semiconductor Corporation

5.8V

5.8V

0.45 mA

0.45 mA

TSD

TSD

PWM

PWM

+

+

_+_

_

4.5V

4.5V

VREF

VREF

OSC

OSC

S

S

R

R

÷4

÷4

UVLO ≤ 6.7V

UVLO ≤ 6.7V

UVLO ≥ 8.7V

UVLO ≥ 8.7V

Q

Q

S

S

Q

Q

R

R

INTERNAL

INTERNAL

BIAS

BIAS

#1 : Vstr

#1 : Vstr

L.E.B

L.E.B

OCP

OCP

#8 : Drain

#8 : Drain

SFET

SFET

+

+

_+_

_

Vth

Vth

#3,#4,#5,#6

#3,#4,#5,#6

GND

GND

Rev.1.0.2

FSDH565

Absolute Maximum Ratings

(Ta=25°C unless otherwise specified)

Parameter Symbol Value Unit

Maximum Drain Voltage V
Continuous Drain Current (T

=25°C) I

C

Maximum Supply Voltage V

D,MAX

CC,MAX

Input Voltage Range V
Operating Ambient Temperature T
Storage Temperature Range T

D

FB

A

STG

650 V

0.3 A
21 V

−0.3 to V

SD

−25 to +85 °C

−55 to +150 °C

PIN Definitions

Pin Number Pin Name Pin Function Description

This pin connects directly to the rectified AC line voltage source. At start up

1Vstr

2Vfb

3, 4, 5, 6 GND These pins are the control ground and the SenseFET Source.

7Vcc

8Drain

the internal switch supplies internal bias and charges an external capacitor
that connects from the Vcc pin to ground. once this reaches 8.7V, Vstr is
isolated internally.

This pin is the inverting input of the PWM comparator, and it operates
normally between 0.5V and 2.5V. It has a 0.45mA current source
connected internally and a capacitor and opto coupler connected
externally. A feedback voltage of 3.5V to 4.5V triggers overload protection
(OLP). There is a time delay due to the 5uA current source, which prevents
false triggering under transient conditions but still allows the protection
mechanism to operate under true overload conditions.

This is the positive supply voltage input. During start up, power is supplied
to this input from Pin 1. When Vcc reaches the UVLO upper threshold
(8.7V), the start up Internal Switch (Vstr) turns off and power is supplied
from auxiliary transformer winding.

This pin is designed to directly drive the converter transformer and is
capable of switching a maximum of 650V and 1A.

DC

V

2

Electrical Characteristics

(Ta=25°C unless otherwise specified)

Parameter Symbol Condition Min. Typ. Max. Unit

SENSEFET SECTION

Drain-Source Breakdown Voltage BV
Zero gate voltage drain current I

Static drain-source on Resistance R
Rise Time T

Fall Time T

DSS

DSS

DS(ON)

R
F

START UP SECTION

VSTR Supply Voltage V

ST

UVLO SECTION

Start Threshold Voltage Vstart - 8.0 8.7 9.4 V
Stop Threshold Voltage Vstop After turn on 6.0 6.7 7.4 V

OSCILLATOR SECTION

Initial accuracy F
Maximum Duty Cycle D
Minimum Duty Cycle D

OSC
MAX

MIN

FEEDBACK SECTION

Feedback Source Current I
Shutdown feedback Voltage V

FB

SD

CURRENT LIMIT(SELF-PROTECTION)SECTION

Peak Current Limit I

OVER

PROTECTION SECTION

(1)

Thermal Shutdown Temperature (Tj)

T

SD

TOTAL DEVICE SECTION

Operating Supply Current I

OP

V

= 0V, ID = 100µA 650 - - V

GS

V

= 520V - - 100 µA

DS

ID = 50mA Tj = 25°C - 36 39 Ω
I

= 50mA Tj = 100°C - 51 59 Ω

D

V

= 325V, ID = 300mA - 100 - nS

DS

V

= 325V, lD = 50mA - 50 - nS

DS

-17--V

Tj = 25°C 90 100 110 kHz
Vfb = 3V 64 67 70 %
Vfb = 0V - 0 0 %

Vfb = 0V 0.40 0.45 0.50 mA

-4.04.55.0V

peak inductor current 0.25 0.3 0.35 A

- 125 145 - °C

V

= 9.5V (Max) - - 3.5 mA

CC

FSDH565

Note:

1. These parameters, although guaranteed, are not 100% tested in production

3