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CS403GTHA5 データシート(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS403GTHA5 データシート(HTML) 4 Page - Cherry Semiconductor Corporation |
4 / 6 page The CS403 function is very precise, has hysteresis on both the and Delay comparators, a latching Delay capacitor discharge circuit, and operates down to 1V. The circuit output is an open collector type with ON and OFF parameters as specified. The output NPN transistor is controlled by the two circuits described (see Block Diagram). This circuit monitors output voltage, and when output voltage is below the specified minimum, causes the output transistor to be in the ON (saturation) state. When the output voltage is above the specified level, this circuit permits the output transistor to go into the OFF state if allowed by the reset Delay circuit. This circuit provides a programmable (external capacitor) delay on the output lead. The Delay lead provides source current to the external delay capacitor only when the Low Voltage Inhibit circuit indicates that output volt- age is above VRT(ON). Otherwise, the Delay lead sinks cur- rent to ground (used to discharge the Delay capacitor). The discharge current is latched ON when the output volt- age is below VRT(OFF), or when the voltage on the Delay capacitor is above VDIS. In other words, the Delay capaci- tor is fully discharged any time the output voltage falls out of regulation, even for a short period of time. This fea- ture ensures a controlled pulse is generated follow- ing detection of an error condition. The circuit allows the output transistor to go to the OFF (open) state only when the voltage on the Delay lead is higher than VDIS. RESET RESET RESET Reset Delay Circuit RESET RESET Low Voltage Inhibit Circuit RESET RESET RESET RESET 4 Application Notes The output or compensation capacitor helps determine three main characteristics of a linear regulator: start-up delay, load transient response and loop stability. The capacitor value and type should be based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capacitor with almost zero ESR, can cause insta- bility. The aluminum electrolytic capacitor is the least expensive solution, but, if the circuit operates at low tem- peratures (-25¡C to -40¡C), both the value and ESR of the capacitor will vary considerably. The capacitor manufac- turers data sheet usually provides this information. The value for the output capacitor COUT shown in the test and applications circuit should work for most applica- tions, however it is not necessarily the optimized solution. To determine an acceptable value for COUT for a particular application, start with a tantalum capacitor of the recom- mended value and work towards a less expensive alterna- tive part. Step 1: Place the completed circuit with a tantalum capac- itor of the recommended value in an environmental cham- ber at the lowest specified operating temperature and monitor the outputs with an oscilloscope. A decade box connected in series with the capacitor will simulate the higher ESR of an aluminum capacitor. Leave the decade box outside the chamber, the small resistance added by Stability Considerations Test Circuit C1* 100nF VIN Gnd Delay VOUT CS403 C2** COUT =10mF to 100 mF 100nF Cd RESET C1* is required if the regulator is far from the power source filter. C2** is required for stability Circuit Description |
同様の部品番号 - CS403GTHA5 |
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同様の説明 - CS403GTHA5 |
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