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TB7101AFT5L3.3 Datasheet(PDF) 10 Page - Toshiba Semiconductor |
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TB7101AFT5L3.3 Datasheet(HTML) 10 Page - Toshiba Semiconductor |
10 / 22 page TB7101AF(T5L1.2,F)/(T5L1.5,F)/(T5L1.8,F)/(T5L2.5,F)/(T5L3.3,F) 2008-05-22 10 Application Circuit Example Figure 1 TB7101AF(T5L*.*,F) Application Circuit Example Component values (@TB7101AF (T5L3.3, F), VIN = 5 V, Ta = 25°C) These values are presented only as a guide. CIN: Input filter capacitor = 10 μF (ceramic capacitor: GRM21BB30J106K from Murata Manufacturing Co., Ltd.) COUT: Output filter capacitor = 10 μF (ceramic capacitor: GRM21BB30J106K from Murata Manufacturing Co., Ltd.) L: Inductor = 3.3 μH (NP04SB3R3N from Taiyo Yuden Co., Ltd.) Component values (@TB7101AF (T5L1.2, F), VIN = 5 V, Ta = 25°C) These values are presented only as a guide. CIN: Input filter capacitor = 10 μF (ceramic capacitor: GRM21BB30J106K from Murata Manufacturing Co., Ltd.) COUT: Output filter capacitor = 22 μF (ceramic capacitor: GRM31CB30J226K from Murata Manufacturing Co., Ltd.) L: Inductor = 3.3 μH (NP04SB3R3N from Taiyo Yuden Co., Ltd.) Component values need to be adjusted, depending on the TB7101AF’s input/output conditions and the board layout. Application Notes Inductor Selection The inductance required for inductor L can be calculated as follows: IN OUT L osc OUT IN V V I f V V L ⋅ Δ ⋅ − = ········· (1) VIN : Input voltage (V) VOUT : Output voltage (V) fosc : Oscillation frequency = 1 MHz (typ.) ΔIL : Inductor ripple current (A) *: Generally, ΔIL should be set to approximately 30% of the maximum output current. Since the maximum output current of the TB7101AF is 1 A, ΔIL should be 0.3 A or so. Therefore, the inductor should have a current rating greater than the peak output current of 1.15 A. If the inductor current rating is exceeded, the inductor becomes saturated, leading to an unstable DC-DC converter operation. When TB7101AF (T5L3.3, F) and VIN = 5 V, the required inductance can be calculated as follows. Be sure to select an appropriate inductor, taking the VIN range into account. PGND TB7101AF (T5L*.*, F) SGND GND VOUT LX VFB GND VIN EN VIN L |
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