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T5L1.2F Datasheet(PDF) 11 Page - Toshiba Semiconductor |
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T5L1.2F Datasheet(HTML) 11 Page - Toshiba Semiconductor |
11 / 17 page TB7101F(T5L1.2,F) , TB7101F(T5L1.5,F) TB7101F(T5L1.8,F) , TB7101F(T5L2.5,F) TB7101F(T5L3.3,F) 2007-09-06 11 H V V mA MHz V V V V I f V V L IN OUT L OSC OUT IN μ 7 . 3 5 3 . 3 300 1 3 . 3 5 = ⋅ ⋅ − = ⋅ Δ ⋅ − = Figure 2: Inductor current waveform Output capacitor The capacitance of the output ceramic capacitor is greatly affected by temperature. Select a product whose temperature characteristics (such as B-characteristic) are excellent. The capacitance value should be to more than 10 μF, and set to an optimum value by, for example, enlarging the output capacitor when there is instability under use conditions ,or when there is a large ripple voltage or drop in output voltage under heavy loads. Ceramic capacitors can be used to achieve low output ripple, though it is more difficult to achieve phase compensation with ceramic capacitors because the equivalent series resistance (ESR) of ceramic capacitors is lower. For this reason, perform a careful evaluation when using ceramic capacitors. Precautions • Please select parts after confirming the actual operation in the customer set and considering the input voltage the output voltage, the output current, the temperature, the characteristics or the kind of capacitor, and the inductor. • If the voltage between the input and output is low, the influence of the on-state voltage of the switch power MOSFET is greater, causing the voltage across the inductor to decrease. For this reason, it may become impossible for the required inductor current to flow, resulting in lower performance or unstable operation of the DC-DC converter. As a rough standard, keep the input-output voltage potential difference at or above 1 V, taking the on-state voltage of the power MOSFET into consideration. • The lowest output voltage that can be set is 0.8 V (typ.). • There is an antistatic diode between the ENB and VIN pins. The voltage between the ENB and VIN pins should satisfy the rating VENB - VIN < 0.3 V • If operation becomes unstable due to switching noise under a heavy load, please mount a by-pass capacitor Ccc between the SGND pin and the VIN pin. OSC f 1 T = IN OUT ON V V T T ⋅ = 0 Δ IL IL |
Similar Description - T5L1.2F |
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