FSDH321_04 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

  • Internal Avalanche Rugged Sense FET
  • Consumes only 0.65W at 240V AC & 0.3W load with Advanced Burst-Mode Operation
  • Frequency Modulation for low EMI
  • Precision Fixed Operating Frequency
  • Internal Start-up Circuit
  • Pulse by Pulse Current Limiting
  • Abnormal Over Current Protection
  • Over V oltage Protection
  • Over Load Protection
  • Internal Thermal Shutdown Function
  • Auto-Restart Mode
  • Under V oltage Lockout
  • Low Operating Current (max 3mA)
  • Adjustable Peak Current Limit
  • Built-in Soft Start

Applications

  • SMPS for STB, Low cost DVD
  • Auxiliary Power for PC
  • Adaptor for Charger

Description

The FSDx321(x stands for H, L) are integrated Pulse Width Modulators (PWM) and Sense FETs specifically designed for high performance offline Switch Mode Power Supplies (SMPS) with minimal external components. Both devices are integrated high voltage power switching regulators which combine an avalanche rugged Sense FET with a cur- rent mode PWM control block. The integrated PWM con- troller features include: a fixed oscillator with frequency modulation for reduced EMI, Under V oltage Lock Out (UVLO) protection, Leading Edge Blanking (LEB), opti- mized gate turn-on/turn-off driver, Thermal Shut Down (TSD) protection, Abnormal Over Current Protection (AOCP) and temperature compensated precision current sources for loop compensation and fault protection circuitry. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSDx321 reduce total component count, design size, weight and at the same time increase efficiency, productivity, and system reliability. Both devices are a basic platform well suited for cost effective designs of flyback converters. Table 1. Notes: 1. Typical continuous power in a non-ven- tilated enclosed adapter measured at 50°C ambient. 2. Figure 1. Typical Flyback Application

Figure 2. Functional Block Diagram of FSDx321

Figure 3. Pin Configuration (Top View) 1 GND Sense FET source terminal on primary side and internal control ground. vice power is supplied via the auxiliary transformer winding. The feedback voltage pin is the non-inverting input to the PWM comparator. mechanism to operate under true overload conditions. and any external resistor to GND on this pin to determine the current limit. If this pin is tied to Vcc or left floating, the typical current limit will be 0.7A. 12V, the internal switch is disabled.

FSDH321, FSDL321 Absolute Maximum Ratings (Ta=25°C, unless otherwise specified) Note: 1. Repetitive rating: Pulse width limited by maximum junction temperature 2. L = 24mH, starting Tj = 25°C Parameter Symbol Value Unit Maximum Vstr Pin Voltage V STR,MAX 650 V Maximum Drain Pin Voltage V DRAIN,MAX 650 V Drain-Gate Voltage (RGS=1MΩ )V DGR 650 V Gate-Source (GND) Voltage V GS ±20 V Drain Current Pulsed (1) IDM 1.5 A DC Continuous Drain Current (Tc=25°C) I D 0.7 A DC Continuous Drain Current (Tc=100°C) I D 0.32 A DC Single Pulsed Avalanche Energy (2) EAS 10 mJ Maximum Supply Voltage V CC,MAX 20 V Input Voltage Range V FB −0.3 to Vstop V Total Power Dissipation P D 1.25 W Operating Junction Temperature. T J +150 °C Operating Ambient Temperature. T A -25 to +85 °C Storage Temperature Range. T STG -55 to +150 °C

FSDH321, FSDL321 Electrical Characteristics (Sense FET Part) (Ta = 25°C unless otherwise specified) Note: 1. Pulse test: Pulse width ≤ 300µS, duty ≤ 2% Parameter Symbol Condition Min. Typ. Max. Unit Sense FET SECTION Drain-Source Breakdown Voltage BV DSS VGS=0V, ID=50µA 650 720 - V Startup Voltage (Vstr) Breakdown BV STR VCC=0V, ID=1mA 650 720 - V Zero Gate Voltage Drain Current I DSS VDS=Max. Rating, VGS=0V -- 2 5 µA VDS=0.8Max. Rating, VGS=0V, TC=125°C - - 200 µA Static Drain-Source on Resistance (Note) RDS(ON) VGS=10V, ID=0.5A - 14 19 Ω Forward Trans conductance (Note) gfs V DS=50V, ID=0.5A 1.0 1.3 - S Input Capacitance C ISS VGS=0V, VDS=25V, f=1MHz - 162 - pFOutput Capacitance C OSS -1 8- Reverse Transfer Capacitance C RSS -3 . 8- Turn on Delay Time td(on) V DD=0.5B VDSS, ID=1.0A (MOSFET switching time is essentially independent of operating temperature) -9 . 5- ns Rise Time tr - 19 - Turn Off Delay Time td(off) - 33 - Fall Time tf - 42 - Total Gate Charge (Gate-Source + Gate-Drain) Qg V GS=10V, ID=1.0A, VDS=0.5B VDSS (MOSFET switching time is essentially independent of operating temperature) -7 . 0- nCGate-Source Charge Qgs - 3.1 - Gate-Drain (Miller) Charge Qgd - 0.4 - S 1 R----=

FSDH321, FSDL321 Electrical Characteristics (Control Part) (Continued) (Ta=25°C unless otherwise specified) Note: 1. These parameters, although guaranteed, are not 100% tested in production 2. These parameters, although guaranteed, are tested in EDS (wafer test) process 3. di/dt = 250mA/uS Parameter Symbol Condition Min. Typ. Max. Unit UVLO SECTION Start Threshold Voltage V START VFB=GND 11 12 13 V Stop Threshold Voltage V STOP VFB= G N D 789V OSCILLATOR SECTION Initial Accuracy F OSC FSDH321 90 100 110 kHzFrequency Modulation F MOD ±2.5 ±3 ±3.5 Initial Accuracy F OSC FSDL321 45 50 55 kHzFrequency Modulation F MOD ±1.0 ±1.5 ±2.0 Frequency Change With Temperature (2) ∆F/∆T- 2 5 °C ≤ Ta ≤ +85°C- ±5 ±10 % Maximum Duty Cycle Dmax FSDH321 62 67 72 % FSDL321 71 77 83 % FEEDBACK SECTION Feedback Source Current I FB Ta=25°C, Vfb = 0V 0.70 0.90 1.1 mA Shutdown Feedback Voltage V SD 5.5 6.0 6.5 V Shutdown Delay Current I DELAY Ta=25°C, Vfb = 4V 3.5 5.0 6.5 µA BURST MODE SECTION Burst Mode Voltage VBURH Tj = 25°C 0.4 0.5 0.6 V VBURL 0.25 0.35 0.45 V Hysteresis - 150 - mV CURRENT LIMIT(SELF-PROTECTION)SECTION Peak Current Limit(3) ILIM Tj = 25°C 0.60 0.70 0.80 A Current Limit Delay(1) TCLD Tj = 25 °C - 600 - ns SOFT START SECTION Soft Start Time T SS Vfb = 4V 10 15 20 ms PROTECTION SECTION Thermal Shutdown Temperature (1) TSD - 125 145 - °C Over Voltage Protection V OVP 18 19 20 V TOTAL STANDBY CURRENT SECTION Startup Charging Current I CH VCC=0V 0.7 0.85 1.0 mA Operating Supply Current (Control Part Only) IOP VCC = 14V, Vfb = 0V 1 3 5 mA

FSDH321, FSDL321 Comparison Between FSDM311 and FSDx321 Function FSDM311 FSDx321 FSDx321 Advantages Soft-Start 15mS 15mS • Gradually increasing current limit during soft-start further reduces peak current and voltage component stresses

  • Eliminates external components used for soft-start in most applications
  • Reduces or eliminates output overshoot External Current Limit not applicable Programmable of default current limit
  • Smaller transformer
  • Allows power limiting (constant over- load power)
  • Allows use of larger device for lower losses and higher efficiency. Frequency Modulation not applicable ±1.5KHz @50KHz ±3.0KHz @100KHz
  • Reduced conducted EMI Burst Mode Operation Yes-built into controller Yes-built into controller
  • Improve light load efficiency
  • Reduces no-load consumption
  • Transformer audible noise reduction Drain Creepage at Package 7.62mm 7.62mm • Greater immunity to arcing as a result of build-up of dust, debris and other contaminants

FSDH321, FSDL321 Typical Performance Characteristics (Control Part) (These characteristic graphs are normalized at Ta = 25°C) Operating Frequency (Fosc) Frequency Modulation (FMOD) Maximum duty cycle (Dmax) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Te mp[℃] Normalized Operating supply current (Iop) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Temp[ ℃] Nomalized Start Threshold Voltage (Vstart) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Te mp[℃] Normalized Stop Threshold Voltage (Vstop) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Temp[ ℃] Normalized 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Te mp[℃] Normalized 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Temp[ ℃] Normalized

FSDH321, FSDL321 Typical Performance Characteristics (Continued) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Temp[ ℃] Normalized Feedback Source Current (Ifb) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Te mp[℃] Normalized Peak current limit (ILIM) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Temp[ ℃] Normalized Start up Current (Istart) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Te mp[℃] Normalized Startup Charging Current (Ich) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Te mp[℃] Normalized Burst peak current (Iburst) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -50 0 50 100 150 Temp[ ℃] Normalized Over Voltage Protection (Vovp)

  1. Startup : In previous generations of Fairchild Power

Figure 4. High voltage current source

  1. Feedback Control : The FSDx321 employs current mode
  2. Leading edge blanking (LEB) :

Figure 5. Pulse width modulation (PWM) circuit

  1. Protection Circuit : The FPSTM has several protective func-

4.1 Over Load Protection (OLP) :

time required to charge Cfb from 3V to 6V with 5uA.

3 OSC

Figure 6. Over load protection

4.2 Thermal Shutdown (TSD) : The Sense FET and the con-

4.3 Abnormal Over Current Protection (AOCP) :

Figure 7. AOCP Function & Block AOCP stops Sense FET within 350nS after it is activated.

4.4 Over Voltage Protection (OVP) : In case of malfunc-

be properly designed to be below 19V . of Sense FET current are allowed during the start-up phase. reduce the stress on the secondary diode.

  1. Adjusting Current limit function: As shown in fig 12, a

the main current source of 900uA. Figure 12. Peak current adjustment

FSDH321, FSDL321 10W PC Auxiliary Power, 150~375VDC Input Power supply: It shows a auxiliary power for PC. Efficiency at 10W, 150/ 375VDC is ≥70%. The PC application has the standard of standby power con- sumption, under 1W at the output load, 0.5W and height input voltage, 230V AC. For this the FSDH321 also has the burst operating function like the any other green mode FPS like FSDM0265RN or FSDM0365RN and so on. This skill reduces the MOSFET switching numbers and power MOS- FET switching loss. This design takes advantage of self pro- tection without external components and high switching frequency, 100kHz. The frequency makes using a small size transformer core possible. The EE16 or EE1625 can be used for 10W application. This is achieved by preventing the green FPS from switching when the input voltage goes below a level needed to main- tain output regulation, and keeping it off until the input volt- age goes above the under-voltage threshold, when the AC is turned on again. For example with the resistor, R101, 680k Ω, the threshold voltage is around 150V AC(210VDC) at the room temperature. Leakage inductance clamping is provided by R102 and C101, keeping the DRAIN voltage below 650 V under all conditions. And R102 dissipates power to prevent rising of DRAIN V oltage caused by leakage inductance. The fre- quency modulation feature of FSDH321 allows the circuit shown to meet CISPR2AB with simple EMI filtering. The secondary is rectified and smoothed by D201. Similarly D102 and D103 are also rectifiers for main power control IC and FSDH321 respectively. The 5V output voltage require two capacitors in parallel to meet the ripple current require- ment. Switching noise filtering is provided by L201. The output is regulated by the reference (TL431) voltage in sec- ondary. It is sensed via R203 and R204. Resistor R201 pro- vides bias for TL431 and R202 sets the overall DC gain. R2012, C202 and R203 provide loop compensation. Typical application circuit 1. PC Auxiliary Power Circuit (10W Output Power) EE1625 D201 SB360 C201 1000uF 16V C203 470uF 16V L201 10uH 5V (+/-5%) C101 10nF 630V R102 100kΩΩΩΩ D101 UF 4007 C104 22nF C103 10uF 50V D103 1N4937 R104 10ΩΩΩΩ R202 330ΩΩΩΩ R201 1kΩΩΩΩ R203 2kΩΩΩΩ C202 100nF R204 2kΩΩΩΩ PC301 H11A817A IC201 KA431 Vfb Vcc Drain GND 140~375 VDC INPUT IC101 FSDx321 6,7,8 R103 10ΩΩΩΩ D102 1N4937 C102 47uF 50V M Vcc C301 2.2nF Vstr R101 680kΩΩΩΩ 10W PC Auxiliary Power Circuit

FSDH321, FSDL321 2. Transformer Specification (10W Output Power) 1. Schematic Diagram 2. Winding Specification 3. Electric Specification and Core and Bobbin EE1625 Np/2 Na N5V NM Vcc 10Np/2 Na NM Vcc N5V Np/2 Np/2 Outer Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding340.20 φ× 15 ! 6Na Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding800.15 φ× 12 ! 1Np/2 Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding400.20 φ× 14 ! 6N MVCC Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding120.55 φ× 110 ! 7N 5V Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding800.15 φ× 13 ! 2Np/2 Winding MethodWinding MethodWinding MethodWinding MethodTurnsTurnsTurnsTurnsWireWireWireWirePin ( S !!!! F ) Outer Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding340.20 φ× 15 ! 6Na Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding800.15 φ× 12 ! 1Np/2 Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding400.20 φ× 14 ! 6N MVCC Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding120.55 φ× 110 ! 7N 5V Insulation : Polyester Tape t = 0.050mm, 3Layers Solenoid winding800.15 φ× 13 ! 2Np/2 Winding MethodWinding MethodWinding MethodWinding MethodTurnsTurnsTurnsTurnsWireWireWireWirePin ( S !!!! F ) 2nd side all short100uH1 - 3Leakage EE1625Core 1kHz, 1V1.8 mH1 – 3Inductance EE1625Bobbin RemarkRemarkRemarkRemarkSpec.Spec.Spec.Spec.Pin 2nd side all short100uH1 - 3Leakage EE1625Core 1kHz, 1V1.8 mH1 – 3Inductance EE1625Bobbin RemarkRemarkRemarkRemarkSpec.Spec.Spec.Spec.Pin

Figure 13. Layout Considerations for FSDx321 using 8DIP

FSDH321, FSDL321 Package Dimensions 8DIP

FSDH321, FSDL321 Package Dimensions (Continued) 8LSOP

FSDH321, FSDL321

Ordering Information

Product Number Package Marking Code BV DSS FOSC RDS(on) FSDH321 8DIP DH321 650V 100KHz 14 Ω FSDL321 8DIP DL321 650V 50KHz 14 Ω FSDH321L 8LSOP DH321 650V 100KHz 14 Ω FSDL321L 8LSOP DL321 650V 50KHz 14 Ω

FSDH321, FSDL321 10/1/04 0.0m 001 Stock#DSxxxxxxxx  2004 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 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.