FAN7554

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These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, an ON/OFF control, a high gain error amplifier, a current sensing comparator, and a high current totem-pole output. The FAN7554 has various protection functions such as an overload protection, an over-current protection, and the over-voltage protection, which include built-in auto restart circuit. The FAN7554 is available in the 8-DIP package. Current mode control Pulse-by-Pulse Current Limiting Low External Components Under-Voltage Lockout(UVLO): 9 V/15 V Stand-by Current: Typical: 100 µA Power Saving Mode Current: Typical: 200 µA Operating Current: Typical. 7 mA Soft-Start On/Off Control Overload Protection (OLP) Over-Voltage Protection (OVP) Over-Current Protection (OCP) Over-Current Limit (OCL) Operating Frequency up to 500 kHz Figure 1. 8-Dip Package 1 A Totem-Pole Output Current Applications  Off-Line & DC-DC Converter Ordering Information Part Number Operating Temperature Range FAN7554 -25 to 85°C © 2003 Fairchild Semiconductor Corporation FAN7554 • Rev. 4.1 Package 8-Lead Dual Inline Package (DIP) Packing Method Rail www.fairchildsemi.com FAN7554 — Versatile PWM Controller April 2016 FAN7554 — Versatile PWM Controller Block Diagram Figure 2. © 2003 Fairchild Semiconductor Corporation FAN7554 • Rev. 4.1 Block Diagram www.fairchildsemi.com 2 FAN7554 — Versatile PWM Controller Pin Configuration / Marking Information Figure 3. Pin Assignment (Top Through View) Pin Descriptions Pin # Pin Name 1 FB Inverting(-) Input of pwm Comparator, On/Off Control & OLP Sensing Terminal 2 S/S Soft-Start 3 IS 4 Rt/Ct Oscillator Time Constant (Rt/Ct) 5 GND Ground 6 OUT Output of Gate Driver 7 VCC Power Supply 8 VREF Output of 5 V Reference © 2003 Fairchild Semiconductor Corporation FAN7554 • Rev. 4.1 Description Non-inverting(+) Input of PWM Comparator, OCL Sensing Terminal www.fairchildsemi.com 3 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 VCC Supply Voltage IO Output Current Min. Max. Unit 30 V ±1 A VFB Input Voltage to FB Pin -0.3 to VSD V VIS Input Voltage to IS Pin -0.3 to VOC V PD Power Dissipation at TA 25°C 0.85 W TOPR Operating Temperature -25 85 °C TSTG Storage Temperature -55 150 °C 147.8 °C/W RJA Thermal Resistance, Junction-to-Air (1) Note: 1. Junction -to -air thermal resistance test environments: - JESD51-2: Integrated circuits thermal test method environmental conditions-natural convection (still air). - JESD51-3: Low effective thermal conductivity test board for leaded surface mount packages. Temperature Characteristics Symbol Parameter Min. Max. Unit VREF3 VREF Temperature Stability ±0.5 % fOSC2 fOSC Temperature Stability ±5 % © 2003 Fairchild Semiconductor Corporation FAN7554 • Rev. 4.1 www.fairchildsemi.com 4 FAN7554 — Versatile PWM Controller Absolute Maximum Ratings Unless otherwise specified, TA = 25C, VCC=16 V, Rt=10 k, Ct=3.3 nF. Symbol Parameter Conditions Min. Typ. Max. 4.90 Unit Reference Section VREF Reference Output Voltage TJ =25°C, IREF = 1 mA 5.00 5.10 V VREF1 Line Regulation VCC = 12 V ~ 25 V 6 20 mV VREF2 Load Regulation IREF = 1 mA ~ 20 mA 6 25 mV Short-Circuit Output Current TJ = 25°C 0.10 0.18 A 50 55 kHz 0.05 1.00 % ISC Oscillator Section fOSC fOSC1 Oscillation Frequency TJ = 25°C Frequency Change with VCC VCC = 12 V ~ 25 V 45 VRH Ramp High Voltage 2.8 V VRL Ramp Low Voltage 1.2 V Idisch Discharge Current VRT/CT = 3.3 V 6.1 9.4 mA V PWM Section VTH(IS) Sense Threshold Voltage VFB = 5 V 0.8 1.0 1.2 VTH(FB) Feedback Threshold Voltage VIS = 0 V 0.2 0.3 0.4 IFB Feedback Source Current D(MAX) Max. Duty Cycle D(MIN) Min. Duty Cycle VFB = 0 V, VS/S = 5 V 1.0 92 95 V mA 98 % 0 % Protection Section ISD Shutdown Delay Current VSD 4 V ≤VFB ≤VSD 3.5 5.0 6.5 µA Shutdown Feedback Voltage VFB > 5 V 5.4 6.0 6.6 V VOC Over-Current Protection 1.6 2.0 2.4 V VOVP Over-Voltage Protection 30 34 38 V VIS > 1.5 V, tON > 500 nS ON/OFF Control Section ISINK Off Mode Sink Current VFB < VTH(FB), VS/S = 5 V VOFF Off Threshold Voltage VFB < VTH(FB) 4 1.2 1.5 mA 1.8 V Soft-Start Section IS/S VLIM(S/S) Soft-Start Current VFB = 5 V, VS/S = 0 V 1.1 mA Soft-Start Limit Voltage VCC = 16 V 5.2 V Continued on the following page… © 2003 Fairchild Semiconductor Corporation FAN7554 • Rev. 4.1 www.fairchildsemi.com 5 FAN7554 — Versatile PWM Controller Electrical Characteristics Unless otherwise specified, TA = 25C, VCC=16 V, Rt = 10 k, Ct = 3.3 nF. Symbol Parameter Conditions Min. Typ. Max. Unit 0.15 0.40 V 15 17 V 1.5 2.5 V 14 16 Output Section VOL1 Low Output Voltage1 VCC = 18 V, IO = 50 mA VOH1 High Output Voltage1 VCC = 18 V, IO = -50 mA VOL2 Low Output Voltage2 VCC = 18 V, IO = 200 mA VOH2 High Output Voltage2 VCC = 18 V, IO = -200 mA (2) tR Rise Time tF Fall Time (2) 13 12 V TJ = 25°C, CL = 1 nF 80 ns TJ = 25°C, CL = 1 nF 40 ns UVLO Section VTH(ST) Start Threshold Voltage 13.2 15.0 16.2 V VOPR(M) Min. Operating Voltage 8.2 9.0 10.2 V 0.1 0.2 mA 7 10 mA 0.2 0.4 mA Total Standby Current Section IST Startup Current IOP Operating Supply Current IOFF Off-State Current VFB