MP118 datasheet(7/8 Pages) ETC2

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MP118 • MP118A

MP118U

INTEGRATED SHUT-DOWN FEATURE

MP118 includes a latching shut-down circuit that allows turning off the output stage by any of the following condi-

tions:

1. MP118 detects an over-temperature condition (see section “Temperature Protection”)

2. MP118 detects an over-current condition (see section “Over-Current Shut-Down Protection”)

3. The external shut-down pin 9 (SD) is active low.

The latching shut-down can be reset by applying a RESET pulse (raising edge) on the RESET pin 10.

Note: If the RESET pulse is applied while one the shut-down conditions still exists (over-temperature or

(SD) active low), the RESET pulse is ignored and the MP118 will remain turned off.

TEMPERATURE PROTECTION

The temperature sensor will shut-down the MP118 once it detects a temperature at or above 100°C. The tempera-

ture protection includes a hysteresis to ensure the proper cooling down of the system.

Note: The system will remain shut-down while the over-temperature condition exists. If the RESET pulse

is applied while an over-temperature condition exists, the pulse is ignored and the MP118 will remain

turned off.

EXTERNAL SHUT-DOWN SIGNAL

MP118 can be shut-down also by applying a low signal to the (SD) pin. The signal (SD) needs to be high impedance

when not active, and pulled to GND level when active.

Note:

1. If monitored, a logic 0 at the (SD) output indicates the part is in thermal shutdown.

2. If (SD) goes from logic 0 to 1, then it has traversed the hysteresis window and is now ready for a RESET

OVER-CURRENT SHUT-DOWN PROTECTION

Two current sense lines are to be connected directly across the current

sense resistor. For the over-current protection to work correctly, pin 28

must be connected to the amplifier output side and pin 27 connected

to the load side of the current sense resistor RLIM as shown in Figure

6. This connection will bypass any parasitic resistances RP, formed by

socket and solder joints as well as internal amplifier losses. The current

sense resistor may not be placed anywhere in the output circuit except

where shown in the figure. The value of the current sense resistor can

be calculated as follows: RLIM = 0.65V/ISD

BOOST OPERATION

With the boost feature the small signal stages of the amplifier are operated at higher supply voltages than the ampli-

fier’s high current output stage. +VB (pins 4, 8) and -VB (pins 25, 30) are connected to the small signal stages and

+VS (pins 14-16) and -VS (pins 17-19) are connected to the high current output stage. An additional 10V on the +VB

and -VB pins is sufficient to allow the small signal stages to drive the output stage into the triode region and improve

the output voltage swing for extra efficient operation when required.

When the boost feature is not needed, +VS and -VS are connected to the +VB and -VB pins respectively. The +VB

and -VB pins must not be operated at supply voltages less than +VS and -VS respectively.

OUT

11-13

20-22

SD-

SD+

LIM

Figure 6: Over-current Protection

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