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TS3300DB 数据表(PDF) 2 Page - Touchstone Semiconductor Inc |
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TS3300DB 数据表(HTML) 2 Page - Touchstone Semiconductor Inc |
2 / 4 page TS3300 Demo Board TS3300DB r1p0 Page 2 RTFDS DESCRIPTION The TS3300 boost regulator is set to an output voltage of 3V while the LDO is set to an output voltage of 1.8V via a resistor divider circuit. The boost regulator and the LDO can be shutdown separately via J1 and the combination of J2 and J3, respectively. The LDO switch/FET can be fully enhanced via the combination of J2 and J3. Refer to Table 1 and Table 2. The complete demo board circuit is shown in Figure 6. Resistor R1 in combination with R2 create a voltage divider circuit that sets the desired anti-crush TM voltage. The demo board does not include R2. Refer to the TS3300 product datasheet “Applications Information” section for more details. BOOST REGULATOR OUTPUT VOLTAGE SETTING The output voltage can be set via a voltage divider circuit as shown in Figure 3. The output feedback (BO FB) pin is 505mV. It is recommended to use large resistor values to minimize additional current draw at the output. Resistors values less than 8M Ω are recommended. Boost output voltage can be set by solving for R3 for a given R6 value in the following equation: 3 O 0.505 6 0.505 To set a 3V output voltage with R6 = 1.37M Ω, R3 is calculated to be 6.77M Ω. A 1% standard resistor value of 6.81M Ω is selected. This results in an output voltage of 3.02V. LDO OUTPUT VOLTAGE SETTING The LDO output voltage can be set independently of the boost, via a voltage divider circuit as shown in Figure 4. The output feedback (REG FB) pin is 505mV. It is recommended to use large resistor values to minimize additional current drawn from the output. The LDO output voltage can be set by solving for R4 for a given R5 value in the following equation: O T 0.505 5 0.505 To set a 1.8V output voltage with R4 = 2.61M Ω, R4 is calculated to be 6.69M Ω. A 1% standard resistor value of 6.81M Ω is selected. This results in an output voltage of 1.82V. ANTI-CRUSH TM VOLTAGE SETTING To set the anti-crush TM voltage, a feedback pin (BI FB) in conjunction with a voltage divider circuit can be implemented as shown in Figure 5. The feedback pin voltage is 392mV. It is recommended to use large resistor values to minimize additional current draw at the input. Jumper J1 FUNCTION low Boost Enabled high Boost Shutdown Table 2. Boost Regulator Shutdown/Enable Settings SW EN Jumper J2 REG EN Jumper J3 CONDITION FUNCTION low high REG FB connected to R4, R5 LDO Normal Operation REG FB connected to BO pin (See “Quick Start Procedure ”, step 6) LDO Shutdown high low Internal FET Hard-on Table 1. LDO REG EN(J3) and SW EN(J2)Settings Figure 3: Setting the Boost Output Voltage with a Voltage Divider Figure 4: Setting the LDO Output Voltage with a Voltage Divider |
类似零件编号 - TS3300DB |
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类似说明 - TS3300DB |
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