FAN100 FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
Constant-Voltage (CV) and Constant-current (CC) Control without Secondary-feedback Circuitry Green Mode PWM Frequency Linearly Decreasing Fixed PWM Frequency at 42kHz with Frequency Hopping to Solve EMI Problem Low Startup Current: 10μA Low Operating Current: 3.5mA Peak-Current-Mode Control in CV Mode Cycle-by-Cycle Current Limiting VDD Over-Voltage Protection with Auto-Restart VDD Under-Voltage Lockout (UVLO) Gate Output Maximum Voltage Clamped at 18V Fixed Over-temperature Protection with Latch SOP-8 Package Available
Applications
Battery chargers for cellular phones, cordless phones, PDA, digital cameras, power tools Replaces linear transformer and RCC SMPS Related Resources AN-6067 Design Guide for FAN100/102/FSEZ1016A/1216
Description
This highly integrated PWM controller, FAN100, provides several features to enhance the performance of low-power flyback converters. The proprietary topology enables simplified circuit design for battery charger applications. A low-cost, smaller, and lighter charger results when compared to a conventional design or a linear transformer. The startup current is only 10µA, which allows use of large startup resistance for further power saving. To minimize the standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency under light-load conditions. This green-mode function assists the power supply meeting the power conservation requirements. Using FAN100, a charger can be implemented with fewest external components and minimized cost. A typical output CV/CC characteristic envelope is shown in Figure 1. FAN100 controller is available in an 8-pin SOP package. Figure 1. Typical Output V-I Characteristic
Ordering Information
Temperature Range Eco Status Package Packing Method FAN100MY -40°C to +105°C Green 8-Lead, Small Outline Package (SOP-8) Tape & Reel For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN100 Rev. 1.0.0 4 FAN100 — Primary-Side-Control PWM Controller Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit VVDD DC Supply Voltage (1,2) 30 V VVS VS Pin Input Voltage -0.3 7.0 V VCS CS Pin Input Voltage -0.3 7.0 V VCOMV Voltage Error Amplifier Output Voltage -0.3 7.0 V VCOMI Voltage Error Amplifier Output Voltage -0.3 7.0 V PD Power Dissipation (T A＜50°C) 660 mW ΘJA Thermal Resistance (Junction-to-Air) 150 °C /W ΘJC Thermal Resistance (Junction-to-Case) 39 °C /W TJ Operating Junction Temperature +150 °C TSTG Storage Temperature Range -55 +150 °C TL Lead Temperature (Wave Soldering or IR, 10 Seconds) +260 °C Electrostatic Capability, Human Body Model, JEDEC: JESD22-A114 4.5 KV ESD Electrostatic Capability, Charged Device Model, JEDEC: JESD22-C101 2000 V Notes: 1. Stresses beyond those listed under ”absolute maximum ratings” may cause permanent damage to the device. 2. All voltage values, except differential voltages, are given with respect to GND pin. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Conditions Min. Typ. Max. Unit TA Operating Ambient Temperature -40 +105 °C
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN100 Rev. 1.0.0 5 FAN100 — Primary-Side-Control PWM Controller
Electrical Characteristics
VDD=15V and TA=25°C, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units VDD SECTION VOP Continuously Operating Voltage 25 V VDD-ON Turn-On Threshold Voltage 15 16 17 V VDD-OFF Turn-Off Threshold Voltage 4.5 5.0 5.5 V IDD-OP Operating Current VDD=20V, fS=fOSC, VVS=2V, VCS=3V, CL=1nF 3.5 5.0 mA IDD-GREEN Green Mode Operating Supply Current VDD=20V, VVS=2.7V fS=fOSC-N-MIN, VCS=0V CL=1nF, VCOMV=0V 1 2 mA VDD-OVP VDD Over-Voltage Protection Level VCS=3V, VVS=2.3V 27 28 29 V tD-VDDOVP VDD Over-Voltage Protection Debounce Time fS=fOSC, VVS=2.3V 100 250 400 μs OSCILLATOR SECTION Center Frequency TA=25°C 39 42 45 fOSC Frequency Frequency Hopping Range KHz tFHR Frequency Hopping Period T A=25°C 3 ms fOSC-N-MIN Minimum Frequency at No Load V VS=2.7V, VCOMV=0V 550 Hz fOSC-CM-MIN Minimum Frequency at CCM V VS=2.3V, VCS=0.5V 20 KHz fDV Frequency Variation vs. VDD Deviation VDD=10V to 25V 5 % fDT Frequency Variation vs. Temperature Deviation TA=-40°C to 85°C 15 % VOLTAGE-SENSE SECTION IVS-UVP Sink Current for Brownout Protection RVS=20K 125 μA Itc IC Compensation Bias Current 9.5 μA VBIAS-COMV Adaptive Bias Voltage Dominated by VCOMV VCOMV=0V, TA=25°C, RVS=20KΩ 1.4 V Continued on following page…
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN100 Rev. 1.0.0 6 FAN100 — Primary-Side-Control PWM Controller Electrical Characteristics (Continued) VDD=15V and TA=25°C, unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units Current-Sense Section tPD Propagation Delay to GATE Output 100 200 ns tMIN-N Minimum On Time at No Load VVS=-0.8V, RS=2KΩ, VCOMV=1V 1100 ns tMINCC Minimum On Time in CC Mode V VS=0V, VCOMV=2V 400 ns DSAW Duty Cycle of SAW Limiter 40 % VTH Threshold Voltage for Current Limit 1.3 V Voltage-Error-Amplifier Section VVR Reference Voltage 2.475 2.500 2.525 V VN Green Mode Starting Voltage on COMV Pin fS=fOSC-2KHz VVS=2.3V 2.8 V VG Green Mode Ending Voltage on COMV Pin fS=1KHz 0.8 V IV-SINK Output Sink Current V VS=3V, VCOMV=2.5V 90 μA IV-SOURCE Output Source Current V VS=2V, VCOMV=2.5V 90 μA VV-HGH Output High Voltage V VS=2.3V 4.5 V Current-Error-Amplifier Section VIR Reference Voltage 2.475 2.500 2.525 V II-SINK Output Sink Current V CS=3V, VCOMI=2.5V 55 μA II-SOURCE Output Source Current V CS=0V, VCOMI=2.5V 55 μA VI-HGH Output High Voltage V CS=0V 4.5 V Gate Section DCYMAX Maximum Duty Cycle 75 % VOL Output Voltage Low V DD=20V, IO=10mA 1.5 V VOH Output Voltage High V DD=8V, IO=1mA 5 V VOH_MIN Output Voltage High V DD=5.5V, IO=1mA 4 V tr Rising Time V DD=20V, CL=1nF 200 300 ns tf Falling Time V DD=20V, CL=1nF 80 150 ns VCLAMP Output Clamp Voltage V DD=25V 15 18 V Over-Temperature-Protection Section TOTP Threshold Temperature for OTP(3) +140 oC Note: 3. When over-temperature protection is activated, the power system enters latch mode and output is disabled.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN100 Rev. 1.0.0 11 FAN100 — Primary-Side-Control PWM Controller Leading-Edge Blanking (LEB) Each time the power MOSFET is switched on, a turn-on spike occurs at the sense resistor. To avoid premature termination of the switching pulse, a leading-edge blanking time is built in. Conventional RC filtering can be omitted. During this blanking period, the current-limit comparator is disabled and cannot switch off the gate driver. Under-Voltage Lockout (UVLO) The turn-on and turn-off thresholds are fixed internally at 16V and 5V. During start-up, the hold-up capacitor must be charged to 16V through the startup resistor to enable the FAN100. The hold-up capacitor continues to supply V DD until power can be delivered from the auxiliary winding of the main transformer. V DD must not drop below 5V during this startup process. This UVLO hysteresis window ensures that hold-up capacitor is adequate to supply V DD during start-up. VDD Over-Voltage Protection (OVP) VDD over-voltage protection prevents damage due to over-voltage conditions. When the voltage V DD exceeds 28V due to abnormal conditions, PWM pulses are disabled until the V DD voltage drops below the UVLO, then starts up again. Over-voltage conditions are usually caused by open feedback loops. Over-Temperature Protection (OTP) The built-in temperature-sensing circuit to shut down PWM output once the junction temperature exceeds 140°C. While PWM output is shut down, the V DD voltage gradually drops to the UVLO voltage. Some of the FAN100’s internal circuits are shut down and V DD gradually starts increasing again. When V DD reaches 16V, all the internal circuits, including the temperature sensing circuit, start operating normally. If the junction temperature is still higher than 140°C, the PWM controller shuts down immediately. This situation continues until the temperature drops below 110°C. Gate Output The BiCMOS output stage is a fast totem pole gate driver. Cross conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability. The output driver is clamped by an internal 15V Zener diode to protect power MOSFET transistors against undesired over-voltage gate signals. Built-in Slope Compensation The sensed voltage across the current-sense resistor is used for current-mode control and pulse-by-pulse current limiting. Built-in slope compensation improves stability and prevents sub-harmonic oscillations due to peak-current mode control. The FAN100 has a synchronized, positively-sloped ramp built-in at each switching cycle. Noise Immunity Noise from the current sense or the control signal can cause significant pulse-width jitter, particularly in continuous-conduction mode. While slope compensation helps alleviate these problems, further precautions should still be taken. Good placement and layout practices should be followed. Avoiding long PCB traces and component leads, locating compensation and filter components near the FAN100, and increasing the power MOS gate resistance are advised.
Figure 25. 5W (5V/1A) Application Circuit
B) ALL DIMENSIONS ARE IN MILLIMETERS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
1.75 MAX
Figure 26. 8-Lead, Small Outline Package (SOP-8) warranty therein, which covers Fairchild products.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN100 Rev. 1.0.0 14 FAN100 — Primary-Side-Control PWM Controller