Datasheet LTM4663 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | Ultrathin 1.5A µModule Thermoelectric Cooler (TEC) Regulator |
| Pages / Page | 22 / 10 — APPLICATIONS INFORMATION. Figure 4. TEC Voltage Limit Setting. Figure 3. … |
| File Format / Size | PDF / 2.1 Mb |
| Document Language | English |
APPLICATIONS INFORMATION. Figure 4. TEC Voltage Limit Setting. Figure 3. Soft-Start Profile in Cooling Mode
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APPLICATIONS INFORMATION
VLDR VOLTAGE REACH TEC VOLTAGE VOLTAGE CLK LIMIT AND INTERNAL LIMIT SOFT-START VPWM HEATING TEC VOLTAGE BUILDS UP VREF VB 10k VLIM/SD 10µA DISABLE RV SW OPEN = VVLIM_COOL SW CLOSED = V DISCHARGE SOFT-START VLIM_HEAT PREBIAS BEGINS 4663 F04 TIME
Figure 4. TEC Voltage Limit Setting
4663 F03
Figure 3. Soft-Start Profile in Cooling Mode
The maximum TEC voltage in the cooling mode can be
MAXIMUM TEC VOLTAGE LIMIT
calculated as: The maximum voltage of the TEC driver in the LTM4663 R V V can be programmed individually by applying a resistor LIM_COOL = 2 • 2.5V • 10k +RV (RV) from VLIM/SD pin to GNDA. The voltage limiter oper- ates bidirectionally and allows the cooling limit to be dif- The maximum TEC voltage in the heating mode can be ferent from the heating limit. calculated as: As shown in Figure 4, the internal current sink circuitry ⎛ R 10k •R ⎞ V V –10µA • V connected to V LIM_HEAT = 2 • 2.5V • LIM/SD draws a current when the LTM4663 ⎝⎜ 10k +RV 10k +RV ⎠⎟ drives the TEC in a heating direction, which lowers the voltage at VLIM/SD. The current sink is not active when See Table 2 for the list of Typical TEC Voltage Limit the TEC is driven in a cooling direction; therefore, the settings. TEC heating voltage limit is always lower than the cooling voltage limit.
Table 2. Example of Typical TEC Voltage Limit Setting BOTTOM MAX TEC VOLTAGE MAX TEC VOLTAGE RESISTOR RV (COOLING MODE) (HEATING MODE) (kΩ) (V) (V)
OPEN 5 –4.8 90.9 4.5 –4.32 40.2 4 –3.84 23.2 3.5 –3.35 15 3 –2.88 10 2.5 –2.4 6.65 2 –1.92 4.22 1.5 –1.42 2.49 1 –0.96 Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Package Description Design Resources Related Parts
APPLICATIONS INFORMATION
VLDR VOLTAGE REACH TEC VOLTAGE VOLTAGE CLK LIMIT AND INTERNAL LIMIT SOFT-START VPWM HEATING TEC VOLTAGE BUILDS UP VREF VB 10k VLIM/SD 10µA DISABLE RV SW OPEN = VVLIM_COOL SW CLOSED = V DISCHARGE SOFT-START VLIM_HEAT PREBIAS BEGINS 4663 F04 TIME
Figure 4. TEC Voltage Limit Setting
4663 F03
Figure 3. Soft-Start Profile in Cooling Mode
The maximum TEC voltage in the cooling mode can be
MAXIMUM TEC VOLTAGE LIMIT
calculated as: The maximum voltage of the TEC driver in the LTM4663 R V V can be programmed individually by applying a resistor LIM_COOL = 2 • 2.5V • 10k +RV (RV) from VLIM/SD pin to GNDA. The voltage limiter oper- ates bidirectionally and allows the cooling limit to be dif- The maximum TEC voltage in the heating mode can be ferent from the heating limit. calculated as: As shown in Figure 4, the internal current sink circuitry ⎛ R 10k •R ⎞ V V –10µA • V connected to V LIM_HEAT = 2 • 2.5V • LIM/SD draws a current when the LTM4663 ⎝⎜ 10k +RV 10k +RV ⎠⎟ drives the TEC in a heating direction, which lowers the voltage at VLIM/SD. The current sink is not active when See Table 2 for the list of Typical TEC Voltage Limit the TEC is driven in a cooling direction; therefore, the settings. TEC heating voltage limit is always lower than the cooling voltage limit.
Table 2. Example of Typical TEC Voltage Limit Setting BOTTOM MAX TEC VOLTAGE MAX TEC VOLTAGE RESISTOR RV (COOLING MODE) (HEATING MODE) (kΩ) (V) (V)
OPEN 5 –4.8 90.9 4.5 –4.32 40.2 4 –3.84 23.2 3.5 –3.35 15 3 –2.88 10 2.5 –2.4 6.65 2 –1.92 4.22 1.5 –1.42 2.49 1 –0.96 Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Package Description Design Resources Related Parts
