MC79M05BTG datasheet(5/9 Pages) ONSEMI

部品番号	MC79M05BTG

部品情報	500 mA Negative Voltage Regulators

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MC79M00 Series

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5

Protection Diodes

When external capacitors are used with MC79M00 series

regulator it is sometimes necessary to add protection diodes

to prevent the capacitors from discharging through low

current points into the regulator or from output polarity

reversals

. Generally, no protection diode is required for

values of output capacitance less then 10

mF. Figure 2 shows

the MC79M15 with the recommended protection diodes.

• Opposite Polarity Protection

Diode D1 protects the regulator from output polarity

reversals during startup, power off and short-circuit

operation.

• Reverse-bias Protection

Diode D2 prevents output capacitor from discharging thru

the MC79M15 during an input short circuit or fast switch off

of power supply.

Figure 2. Protection Diodes

Gnd

+

-20 V

Input

-15 V

Output

MC79M15

+

1.0

mF

1.0

mF

MBRS140

or Equiv

D1

MBRS140

or Equiv

D2

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