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Hello, Please ask a question about TCM829ECT Datasheet
# Example questions:
➢ What is the recommended approach for input supply bypassing, and how does it differ based on the load configuration (loaded from out to gnd vs. in to out)?
➢ How does increasing the capacitance of c1 generally affect the output resistance (rout)?
➢ What are the four factors that affect the overall power efficiency of the charge pump?
| Part No. | TCM829ECT |
| Manufacturer | MICROCHIP |
| Size | 378 Kbytes |
| Pages | 26 pages |
| Description | Switched Capacitor Voltage Converters |
Okay, here's a breakdown and summary of the information from the provided text. I'll structure this into categories for clarity:
1. Device Overview & Function
️· Device Type: Charge pump converters (TCM828/TCM829)
️· Function: Invert the input voltage (V<sub>IN</sub>). They create a negative voltage from a positive voltage.
️· Operation: Two-phase operation using switches and capacitors. During the first phase, C1 charges to the voltage on V<sub>IN</sub>. During the second phase, C1 is transferred to C2.
️· No Regulation: The devices *do not* regulate the output voltage. The output voltage droops linearly with load current.
2. Key Parameters & Characteristics
️· Output Voltage Droop: V<sub>DROOP</sub> = I<sub>OUT</sub> x R<sub>OUT</sub>. The output voltage is approximately – V<sub>IN</sub> minus the droop.
️· Equivalent Output Resistance (R<sub>OUT</sub>): Approximately 25Ω nominal at +25°C and V<sub>IN</sub> = +5V.
️· Efficiency Factors: Affected by:
- Losses from oscillator, switching, etc.
- MOSFET on-resistance (R<sub>SW</sub>)
- Capacitor Equivalent Series Resistance (ESR)
- Charge transfer losses.
️· Output Voltage Ripple: Can be reduced by using larger capacitors and capacitors with low ESR.
️· Input Bypassing: Recommended for AC impedance reduction and noise mitigation.
3. Design Considerations & Recommendations
️· Capacitor Selection: Use low-ESR capacitors for lowest R<sub>OUT</sub> and lowest ripple.
️· C1 Value: Larger C1 lowers R<sub>OUT</sub>.
️· C2 Value: Larger C2 reduces output ripple.
️· Input Bypass Capacitor: Required, size depends on application setup.
️· Cascading: Can be done to increase output voltage. Beware that it increases R<sub>OUT</sub>.
4. Tables & Equations (Key Takeaways)
️· Table 5-1 (Output Resistance vs. C1): Shows how the output resistance changes with the value of capacitor C1.
️· Table 5-2 (Output Voltage Ripple vs. C2): Shows how the output ripple changes with the value of capacitor C2.
️· Equation 2 (PLOSS 4): Describes losses due to charge transfer.
️· Equation 3 (V RIPPLE): Describes output ripple.
Essentially, the document is a comprehensive guide to using the TCM828/TCM829 charge pump converters, outlining their operation, limitations, and design considerations for optimal performance.
1. Device Overview & Function
️· Device Type: Charge pump converters (TCM828/TCM829)
️· Function: Invert the input voltage (V<sub>IN</sub>). They create a negative voltage from a positive voltage.
️· Operation: Two-phase operation using switches and capacitors. During the first phase, C1 charges to the voltage on V<sub>IN</sub>. During the second phase, C1 is transferred to C2.
️· No Regulation: The devices *do not* regulate the output voltage. The output voltage droops linearly with load current.
2. Key Parameters & Characteristics
️· Output Voltage Droop: V<sub>DROOP</sub> = I<sub>OUT</sub> x R<sub>OUT</sub>. The output voltage is approximately – V<sub>IN</sub> minus the droop.
️· Equivalent Output Resistance (R<sub>OUT</sub>): Approximately 25Ω nominal at +25°C and V<sub>IN</sub> = +5V.
️· Efficiency Factors: Affected by:
- Losses from oscillator, switching, etc.
- MOSFET on-resistance (R<sub>SW</sub>)
- Capacitor Equivalent Series Resistance (ESR)
- Charge transfer losses.
️· Output Voltage Ripple: Can be reduced by using larger capacitors and capacitors with low ESR.
️· Input Bypassing: Recommended for AC impedance reduction and noise mitigation.
3. Design Considerations & Recommendations
️· Capacitor Selection: Use low-ESR capacitors for lowest R<sub>OUT</sub> and lowest ripple.
️· C1 Value: Larger C1 lowers R<sub>OUT</sub>.
️· C2 Value: Larger C2 reduces output ripple.
️· Input Bypass Capacitor: Required, size depends on application setup.
️· Cascading: Can be done to increase output voltage. Beware that it increases R<sub>OUT</sub>.
4. Tables & Equations (Key Takeaways)
️· Table 5-1 (Output Resistance vs. C1): Shows how the output resistance changes with the value of capacitor C1.
️· Table 5-2 (Output Voltage Ripple vs. C2): Shows how the output ripple changes with the value of capacitor C2.
️· Equation 2 (PLOSS 4): Describes losses due to charge transfer.
️· Equation 3 (V RIPPLE): Describes output ripple.
Essentially, the document is a comprehensive guide to using the TCM828/TCM829 charge pump converters, outlining their operation, limitations, and design considerations for optimal performance.
| Part No. | TCM829ECT |
| Manufacturer | MICROCHIP |
| Size | 378 Kbytes |
| Pages | 26 pages |
| Description | Switched Capacitor Voltage Converters |
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