MP400FCU



MP400FC

P r o d u c t I n n o v a t i o n F r o m

pin #

pin name

Description

21 - 23, 25 V

IN

Input voltage pins for the on board high voltage switch mode power supply.

24

V

BIAS

Input voltage pin for the boost controller circuitry. This pin is typically tied to V

IN

12 – 15

Q2D

Drain node of the SMPS MOSFET switch. An external RC snubber may be connect from this

node to power ground to reduce or eliminate overshoot and ringing at switch turn off, reducing

switching noise on the SMPS.

8

V

B

This is the output of the high voltage SMPS and typically is tied to pin 6, L

be added to this pin as long as the maximum output power of the SMPS is not exceeded. For

proper operation, an external high voltage, low ESR capacitor must be connected to this pin.

Refer to the paragraph titled “SMPS Output Capacitor”.

6

L

FIN

The high voltage SMPS, VB , is connected to this pin to power the MP400FC amplifier through a

47uH filter inductor. The supply current in to this pin can not exceed 200mA.

4

+V

S

MP400FC amplifier high voltage supply pin. This pin is used for external supply bypass. A high

quality ceramic capacitor of at least 1uF should be used. The high voltage SMPS, V

connected directly to this pin, bypassing the 47uH filter inductor.

34

RSET

SMPS voltage set resistor. A resistor is connected from this pin to power ground to set the SMPS

voltage.

26 – 33

PGND

Power ground. SMPS switching circuits are referenced to ground through these pins.

35

AGND

Analog ground for MP400FC amplifier circuits. AGND and PGND are connected at one point on

the MP400FC. Avoid external connects between AGND and PGND.

41

-Vs

This pin is typically connected to AGND. However, an external negative supply voltage can be

connected to this pin.

39

+IN

Amplifier non-inverting input

40

-IN

Amplifier inverting input

1

V

OUT

Amplifier output

2

I

LIM

Amplifier current limit. A current limit resistor must be connected between I

0.7/I

36

CR+

+ side compensation capacitor connection one.

37

CC+

+ side compensation capacitor connection two.

38

CR-

- side compensation capacitor connection one.

42

CC-

- side compensation capacitor connection two.

pin Descriptions

external connections

42-Pin DIP

package style Fc