FAN102_09 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: Frequency Reduction at Light Load Fixed PWM Frequency at 42kHz with Frequency Hopping to Reduce EMI Cable Voltage Drop Compensation in CV Mode 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 Auto- Restart SOP-8 Package Available
Applications
Battery Chargers for Cellular Phones, Cordless Phones, PDA, Digital Cameras, Power Tools Replaces Linear Transformer and RCC SMPS Offline High Brightness (HB) LED Drivers
Description
The primary-side PWM controller significantly simplifies power supply design that requires CV and CC regulation capabilities. The FAN102 controls the output voltage and current precisely with the information in the primary side of the power supply, not only removing the output current sensing loss, but eliminating all secondary feedback circuitry. The green-mode function with a low startup current (10µA) maximizes the light-load efficiency so the power supply can meet stringent standby power regulations. Compared with a conventional secondary-side regulation approach, the FAN102 can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. A typical output CV/CC characteristic envelope is shown in Figure 1. Figure 1. Typical Output V-I Characteristic
Ordering Information
Temperature Range Eco Status Package Packing Method FAN102MY -40°C to +105°C Green 8-Lead, Small Outline Package (SOP-8) Tape & Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Figure 4. Top Mark Figure 5. Pin Configuration peak-current-mode control in CV mode and provides for output-current regulation in CC mode. compensation voltage drop due to output cable loss in CV mode. between COMI and GND for compensation current loop gain. between COMV and GND for compensation voltage loop gain. voltage of auxiliary winding. This pin connects two divider resistors and one capacitor.
7 VDD
Power Supply. IC operating current and MOSFET driving current are supplied using this pin. startup and turn-off are 16V and 5V, respectively. driver to drive the external power MOSFET. The clamped gate output voltage is 18V.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN102 Rev. 1.0.3 4 FAN102 — 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 VDD 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 (TA＜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 Discharge Capability, Human Body Model, JEDEC- JESD22_A114 4.5 kV ESD Electrostatic Discharge Capability, Charged Device Model, JEDEC- JESD22_C101 1250 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 FAN102 Rev. 1.0.3 5 FAN102 — 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-ST Startup Current 0< V DD < VDD-ON-0.16V 0 1.6 10.0 μA 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 T A=25°C 39 42 45 fOSC Frequency Frequency Hopping Range TA=25°C ±1.8 ±2.6 ±3.6 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 +105°C 15 % Voltage-Sense Section IVS-UVP Sink Current for Brownout Protection RVS=20KΩ 180 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 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 VTH Threshold Voltage for Current Limit 1.3 V Continued on the following page…
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN102 Rev. 1.0.3 6 FAN102 — Primary-Side-Control PWM Controller VDD=15V and TA=25°C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units 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 Cable Compensation Section VCOMR Variation Test Voltage on COMR Pin for Cable Compensation RCOMR=100KΩ 0.735 V Gate Section DCYMAX Maximum Duty Cycle 75 % VOL Output Voltage LOW V DD=20V, IO=10mA 1.5 V VOH Output Voltage HIGH VDD=8V, IO=1mA 5 V VOH_MIN Output Voltage HIGH VDD=5.5V, IO=1mA 4 V tr Rising Time V DD=20V, CL=1nF 200 300 ns tf Falling Time VDD=20V, CL=1nF 80 150 ns VCLAMP Output Clamp Voltage VDD=25V 15 18 V Over-Temperature-Protection Section TOTP Threshold Temperature for OTP(3) +140 °C Note: 3. When over-temperature protection is activated, the power system enters auto restart mode and output is disabled.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN102 Rev. 1.0.3 14 FAN102 — Primary-Side-Control PWM Controller Typical Application Circuit (Continued) Transformer specification Core: EE16 Bobbin: EE16 Pin Specification Remark Primary-Side Inductance 1 －3 2.3mH ± 5% 100kHz, 1V Primary-Side Effective Leakage 1 －8 65μH ± 5%. Short one of the secondary windings
B) ALL DIMENSIONS ARE IN MILLIMETERS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
1.75 MAX
Figure 33. 8-Lead, Small Outline Package (SOP-8) warranty therein, which covers Fairchild products.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN102 Rev. 1.0.3 16 FAN102 — Primary-Side-Control PWM Controller