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TCM852EOA Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc |
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TCM852EOA Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc |
4 / 7 page 4-30 TELCOM SEMICONDUCTOR, INC. The relationship between output voltage and control voltage for the TCM853 (Figure 5) is given by: VOUT = VCTRL (–1.28) ( R2 R1 ) Figure 4. TCM850/851/852 Adjustable Application NEGOUT FB OUT VIN All caps = 1.0 µF unless otherwise noted TCM850 TCM851 TCM852 C1 C3 C2 GND C1 + C1 – SHDN SHDN OSC VOUT = –2.56V R2 = 100k R1 = 100k IOUT C4 10 µF Figure 5. TCM853 Standard Application Circuit DETAILED DEVICE DESCRIPTION The voltage applied to VIN is inverted by a capacitive charge pump (using commutating capacitor C1 and reser- voir capacitor C2). The negative voltage at NEGOUT is then regulated by an internal linear regulator, the output of which is connected to the OUT pin (Figure 1). The most negative output voltage possible is the inverted input voltage (i.e. –VIN) plus 1.0V (required by the post regulator). The linear regulator reduces combined output noise (charge pump ripple plus incoming supply noise) to 2mVp-p for the TCM850/ 1/2 and 1mVp-p for the TCM853. APPLICATIONS INFORMATION Setting the Output Voltage The TCM850/1/2 operate in the fixed output voltage mode (OUT = – 4.1V) when the FB input is grounded (Figure 3). The output voltage can be adjusted by connecting FB to the midpoint of a resistive voltage divider from OUT to GND (Figure 4). Care must be taken to allow a minimum of 1.0V across the linear regulator for proper regulation. The output voltage is calculated using the formula below (R2 should be chosen to be between 100k Ω and 400kΩ): VOUT = (–1.28) (1+ R2 R1 ) NEGOUT FB OUT VIN VOUT = –4.1V All caps = 1.0 µF unless otherwise noted IOUT TCM850 TCM851 TCM852 C1 C3 C2 C4 10 µF GND C1 + C1 – SHDN SHDN OSC Figure 3. TCM850/851/852 Standard Application NEGOUT CONT OUT VIN VOUT = – 0.5V to – 9.0V VCTRL (0 to 10V) All caps = 1.0 µF unless otherwise noted R2 = 100k R1 = 100k IOUT TCM853 C1 C3 C2 C4 10 µF GND C1 + C1 – SHDN TCM850 TCM851 TCM852 TCM853 REGULATED GaAs FET BIAS SUPPLY |
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