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FSDH0165
Fairchild Power Switch(FPS)
Features
• • • • • • • • • • Single Chip 650V 1A SenseFET PowerSwitch Precision Fixed Operating Frequency (100kHz) Internal Start-up Switch UVLO with Hysterisis (6.7V/8.7V) Over Load Protection (typ. 4.5V) Over Current Protection (typ. 0.6A) Internal Thermal Shutdown Function Secondary Side Regulation Auto-restart mode No load consumption <250mW at 265VAC input
Description
The FSDH0165 is specially designed for an off-line SMPS with minimal external components. The FSDH0165 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, thermal shut down protection and temperature compensated precision current sources for loop compensation and fault protection circuitry. compared to discrete MOSFET and controller or RCC switching converter solution, a FSDH0165 can reduce total component count, design size, weight and at the same time increase efficiency, productivity, and system reliability. It has a basic platform well suited for cost effective design in a flyback converter.
8-DIPH
Applications
• Charger & Adaptor for Mobile Phone, PDA & MP3 • Auxiliary Power for PC
1
1.Vstr 2.Vfb 3.4.5.6.GND 7.Vcc 8.Drain
Internal Block Diagram
#1 : Vstr
UVLO ≤ 6.7V
#7 : Vcc
UVLO VREG(5.8V) 4.5V VREF UVLO ≥ 8.7V INTERNAL BIAS
#8 : Drain
SFET
OSC S Q PWM 0.45 mA + R L.E.B
5.8V 5 uA
#2 : Vfb
OLP + _ 4.5V
OCP S Q R TSD ÷4
©2001 Fairchild Semiconductor Corporation
+ _ Vth
_
#3,#4,#5,#6 GND
Rev.1.0.4
FSDH0165
Absolute Maximum Ratings
(Ta=25°C unless otherwise specified) Parameter Maximum Drain Voltage Continuous Drain Current (TC=25°C) Maximum Supply Voltage Input Voltage Range Operating Ambient Temperature Storage Temperature Range Symbol VD,MAX ID VCC,MAX VFB TA TSTG Value 650 0.6 21 −0.3 to VSD −25 to +85 −55 to +150 Unit V ADC V V °C °C
PIN Definitions
Pin Number 1 Pin Name Vstr Pin Function Description This pin connects directly to the rectified AC line voltage source. At start up 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. These pins are the control ground and the SenseFET Source. 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.
2
Vfb
3,4,5,6 7
GND Vcc
8
Drain
2
FSDH0165
Electrical Characteristics
(Ta=25°C unless otherwise specified) Parameter SENSEFET SECTION Drain-Source Breakdown Voltage Zero gate voltage drain current Static drain-source on Resistance Rise Time Fall Time START UP SECTION VSTR Supply Voltage UVLO SECTION Start Threshold Voltage Stop Threshold Voltage OSCILLATOR SECTION Initial accuracy Maximum Duty Cycle Minimum Duty Cycle FEEDBACK SECTION Feedback Source Current Shutdown feedback Voltage Peak Current Limit PROTECTION SECTION Thermal Shutdown Temperature (Tj) (1) TOTAL DEVICE SECTION Operating Supply Current IOPR VCC = 21V (Max) 4 mA TSD 125 145 °C IFB VSD IOVER Vfb = 0V peak inductor current 0.40 4.0 0.5 0.45 4.5 0.6 0.50 5.0 0.7 mA V A FOSC Dmax Dmin Tj = 25°C Vfb = 3V Vfb = 0V 90 64 100 67 0 110 70 0 kHz % % Vstart Vstop After turn on 8.0 6.0 8.7 6.7 9.4 7.4 V V VST 17 V BVDSS IDSS RDS(ON) TR TF VGS = 0V, ID = 100µA VDS = 520V ID = 50mA Tj = 25°C ID = 50mA Tj = 100°C VDS = 325V, ID = 300mA VDS = 325V, lD = 50mA 650 15.6 25.7 100 50 100 18 30 V µA Ω Ω nS nS Symbol Condition Min. Typ. Max. Unit
CURRENT LIMIT(SELF-PROTECTION)SECTION
Note: 1.These parameters, although guaranteed, are not 100% tested in production
3
FSDH0165
Typical Performance Characteristics
(These characteristic graphs are normalized at Ta=25°C)
[V] 7.2 7.1 7 6.9 6.8 6.7 -25 0 25 50 75 100 125
Vstop
[V] 8.96 8.92 8.88 8.84 8.8 8.76
Vstart
150 [°C]
-25
0
25
50
75
100
125
150 [°C]
Figure 1. Stop Threshold Voltage
[mA] 2.4 2.35 0.44 2.3 2.25 2.2 0.4 2.15 2.1 -25 0 25 50 75 100 125 150 [°C] 0.38 0.42
Figure 2. Start Threshold Voltage
Iopr
[A] 0.46
Ifb
-25
0
25
50
75
100
125
150 [°C]
Figure 3. Oper.