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FPF2194 Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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FPF2194 Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 5 page AN-8019 APPLICATION NOTE © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.1 • 5/3/10 4 Table 2. Transient Performance Data Parameter GSM Mode GPRS Class 10 PA Minimum 3.0V Minimum 3.0V Minimum PA Peak Current 2A for 577µs 2A for 1.5ms VOUT Drop -300mV -520mV Input Current Limit by FPF2195 600mA 600mA Protection and Efficiency The FPF2195 and FAN8060 offer two key advantages. The FPF2195 provides input OCP to ensure the pulsed load during GSM/GPRS transmission does not damage the USB hub side of the power management block or cause it to be reset unexpectedly. The FAN8060 supplies the required 2A peak current and recharges the output capacitance. This limits the input current from the 5V USB input source to 600mA. In addition, the FAN8060 provides maximum output current limit protection, which protects against a dead-short condition at the output load, as shown in Figure 8. As soon as the FAN8060’s inductor current reaches a preset threshold value at the short condition, the internal error amplifier signal is pulled to ground and the inductor current reduces to zero. Until the inductor current rises to the output OCP threshold, the input current is limited to 600mA by the FPF2195 to ensure the output short condition does not affect USB input capacity. VOUT of FAN8060 [1V/div.] VIN of FPF2195 [2V/div.] Load Current [2A/div.] Input current Limit by FPF2195 [20ms/div.] [500mA/div.] Figure 8. FAN8060 Output OCP at a Given Pulse Load of 4A to 0.4A The FPF2195 and FAN8060 power supply reaches 95% efficiency at the average current consumption range shown in Figure 9. The average load current over a 4.62ms period of GSM and GPRS transmission is 340mA and 570mA, respectively. 64 68 72 76 80 84 88 92 96 100 0 0.2 0. 4 0.6 0. 8 1 Load [A] Figure 9. Efficiency of FPF2195 and FAN8060 at VIN=5V, VOUT=3.6V Conclusion The combination of the FPF2195 and FAN8060 offers a reliable solution for GSM/GPRS modems powered by a USB source. The input current protection provided by the FPF2195 prevents the USB input source from overloading and the maximum output current limit Author Ilsoo Yang, Technical Product Marketing, and SungGeun Yoon, Sr. Applications Engineer Related Datasheets FPF2193/4/5 — Full Function Load Switch with Adjustable Current Limit FAN8060 — 1.2MHz Synchronous Step-Down DC/DC Regulator s. |
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Similar Description - FPF2194 |
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