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ML4836 Datasheet(PDF) 7 Page - Micro Linear Corporation |
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ML4836 Datasheet(HTML) 7 Page - Micro Linear Corporation |
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7 / 15 page  ML4836 7 FUNCTIONAL DESCRIPTION (Continued) The magnitude of the offset voltage that will appear at the input is given by VOS = io/gm. For an io of 1µA and a gm of 0.05 µW the input referred offset will be 20mV. Capacitor C1 as shown in Figure 4 is used to block the DC current to minimize the adverse effect of offsets. Slew rate enhancement is incorporated into all of the operational transconductance amplifiers in the ML4836. This improves the recovery of the circuit in response to power up and transient conditions. The response to large signals will be somewhat non-linear as the transconductance amplifiers change from their low to high transconductance mode, as illustrated in Figure 5. END OF LAMP LIFE At the end of a lamp’s life when the emissive material is depleted, the arc current is rectified and high voltage occurs across the lamp near the depleted cathode. The ballast acts as a constant current source so power is dissipated near the depleted cathode which can lead to arcing and bulb cracking. Compact fluorescent lamps are more prone to cracking or shattering because their small diameter can’t dissipate as much heat as the larger linear lamps. Compact fluorescents also present more of a safety hazard since they are usually used in downlighting systems without reflector covers. Figure 4. Compensation Network Figure 5. Transconductance Amplifier Characteristics – + 1 2.5V LAMP FB LEAO R1 C1 C2 VIN DIFFERENTIAL LINEAR SLOPE REGION 0 iO Figure 6. Simplified Model of ML4836 EOL Functionality LAMP NETWORK LAMP R9 PFC ML4836 |
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Similar Description - ML4836 |
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