Rainbow-electronics BA3950A Manual de usuario descargar pdf (Pagina 7)

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Regulator ICs BA3950A

(4) Overcurrent protection circuit

An overcurrent protection circuit is installed in each out-

put system, based on the respective output current. This

prevents IC destruction by overcurrent, by limiting the

current with a curve shape of “7” in the voltage-current

graph. The IC is designed with margins so that current

flow will be restricted and latching will be prevented even

if a large current suddenly flows through a large capaci-

tor. Note that these protection circuits are only good for

preventing damage from sudden accidents. Make sure

your design does not cause the protection circuit to oper-

ate continuously under transitional conditions (for

instance, when output is clamped at 1V

F or higher). Note

that the circuit ability is negatively correlated with temper-

ature.

(5) Thermal protection circuit

A built-in thermal protection circuit prevents thermal

damage to the IC. All outputs are switched OFF when the

circuit operates, and revert to the original state when

temperature drops to a certain level.

(6) Improving ripple rejection by capacitors

Ripple rejection of the CDP and MAIN outputs can be im-

proved by installing a capacitor that reduces the AC gain.

(7) Malfunction in intense electric fields

Note that bringing the IC into an intense electric field

(such as a radio relay station) may result in malfunction.

FThermal derating curve

Estimate of allowable power dissipation (P

MAX.)

S Power consumed by CDP P

1 = (VCC  CDP)  maximum load current of CDP

S Power consumed by µ-COM P

2 = {VCC  (µ-COM)}  maximum load current of µ-COM

S Power consumed by MAIN P

3 = (VCC  MAIN)  maximum load current of MAIN

S Power consumed internally by each circuit P

4 = VCC  supply current

MAX. = P1  P2  P3  P4

1 2 3 4 5 6 7 8

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Rainbow-electronics BA3950A Manual de usuario Pagina 7