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GM66150-1.8TB3T Datasheet(PDF) 10 Page - Gamma Microelectronics Inc. |
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GM66150-1.8TB3T Datasheet(HTML) 10 Page - Gamma Microelectronics Inc. |
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10 / 15 page  Capacitor Requirements For stability and minimum output noise, a capacitor on the regulator output is necessary. The value of this ca- pacitor is dependent upon the output current; lower cur- rents allow smaller capacitors. GM66150 regulators are stable with the minimum capacitor value of 10µF at full load. This capacitor needs not be an expensive low ESR type: aluminum electrolytics are adequate. In fact, extremely low ESR capacitors may contribute to insta- bility. Tantalum capacitors are recommended for sys- tems where fast load transient response is important. Where the regulator is powered from a source with a high AC impedance, a 0.1µF capacitor connected be- tween Input and GND is recommended. This capacitor should has good characteristics to above 250kHz. Minimum Load Current The GM66150 regulators are specified between finite loads. If the output current is too small, leakage cur- rents dominate and the output voltage rises. The 5mA minimum load current swamps any expected leakage current across the operating temperature range. Adjustable Regulator Design The adjustable regulator versions, GM66152 and GM66153, allow programming the output voltage anywhere between 1.25V and the 26V maximum op- erating rating of the family. Two resistors are used. Resistors can be quite large, up to 1MW, because of the very high input impedance and low bias current of the sense comparator: The resistor values are cal- culated by: where V is the desired output voltage. O Figure 11 shows component definition. Applications with widely varying load currents may scale the re- sistors to draw the minimum load current required for proper operation (see above). Error Flag GM66151 and GM66153 versions feature an Error Flag, which looks at the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open- collector output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including an overcurrent fault (the device is in current limit) and low input voltage. The flag output is inoperative dur- ing overtemperature shutdown conditions. Enable Input GM66151 and GM66152 versions feature an enable (EN) input that allows ON/OFF control of the device. Special design allows "zero" current drain when the device is disabled -only microamperes of leakage current flows. The EN input has TTL/CMOS compat- ible thresholds for simple interfacing with logic, or may be directly tied to 30V. Enabling the regulator requires approximately 20µA of current. R1 = R2 ( -1) V OUT 1.240 Figure 11. Adjustable Regulator with Resistor + + V IN V = 1.24V X [1 + (R1 /R2)] OUT V OUT R1 R2 22µF GM66152 10µF 10 |
Similar Part No. - GM66150-1.8TB3T |
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Similar Description - GM66150-1.8TB3T |
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