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TB7100F Datasheet(PDF) 6 Page - Toshiba Semiconductor |
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TB7100F Datasheet(HTML) 6 Page - Toshiba Semiconductor |
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6 / 17 page  TB7100F 2004-09-10 6 Application Circuit Example Figure 1: TB7100F application circuit example Component constants The following values are given only for your reference and may need tuning depending on your input/output conditions and board layout. CIN: Input smoothing capacitance of 10 μF (multilayer ceramic capacitor JMK212BJ106KG, manufactured by Taiyo Yuden Co., Ltd.) COUT: Output smoothing capacitance of 10 μF (multilayer ceramic capacitor JMK212BJ106KG manufactured by Taiyo Yuden Co., Ltd.) CCOMP1: Error amplifier phase compensation capacitance of 3300 pF (@ VIN = 5 V, VOUT = 3.3 V, and RT = 120 kΩ) CCOMP2: Error amplifier phase compensation capacitance (not used if phase compensation is possible only with RCOMP and CCOMP1) CFB: Error amplifier phase compensation capacitance (not used if phase compensation is possible only with RCOMP and CCOMP1) RCOMP: Error amplifier phase compensation resistance of 1 kΩ (@ VIN = 5 V, VOUT = 3.3 V, and RT = 120 kΩ) RT: Oscillation frequency setting resistance of 120 kΩ (@ fOSC = 550 kHz) RFB1: Output voltage setting resistance of 75 kΩ (@ VIN = 5 V, VOUT = 3.3 V, and RT = 120 kΩ) RFB2: Output voltage setting resistance of 24 kΩ (@ VIN = 5 V, VOUT = 3.3 V, and RT = 120 kΩ) L: Inductor 6.8 μH (@ VIN = 5 V, VOUT = 3.3 V, and RT = 120 kΩ); CDRH4D28C/LD series, manufactured by Sumida Corporation SBD: Schottky barrier diode CRS06 (@ VRRM = 20 V and IF(AV) = 1 A), manufactured by Toshiba Corporation How to use Setting the Inductance The required inductance can be calculated by using the following equation: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − ⋅ Δ ⋅ = IN V OUT V 1 L I OSC f OUT V L … (1) VIN: Input voltage (V) fOSC: Oscillation frequency (Hz) VOUT: Output voltage (V) Δ IL: Inductor ripple current (A) * Generally, ΔIL should be set to 30% to 40% of the peak current flowing through the inductor. For the TB7100F, set ΔIL to 0.3 A, as its peak switch current [ISW(PEAK)] is 1 A (min). Therefore select an inductor whose current rating is no lower than the peak switch current [1 A (min)] of the TB7100F. If the current rating is exceeded, the inductor becomes saturated, leading to an unstable DC-DC converter operation. If VIN = 5 V and VOUT = 3.3 V, the required inductance can be calculated as below. Be sure to select an inductor with an optimum constant by taking VIN variations into consideration. TB7100F SBD RFB1 RFB2 CFB COUT RT CCOMP1 RCOMP CCOMP2 CIN FB PGND SGND ENB VIN RT COMP VIN=5V VOUT=3.3V GND GND L SW |
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Similar Description - TB7100F |
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