Powerex M57182N-315, M57184N-715 Application Information

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M57182N-315 and M57184N-715 Hybrid DC-DC Converters

By Eric Motto and Joanne Achhammer Second Release – June 20, 2000

(1) Introduction

The M57182N-315 and M57184N-715 are high input voltage, non-isolated, step down, DC-DC converters designed to provide low voltage control power for Application Specific Intelligent Power Modules (ASIPM), Original DIP-IPMs, Mini DIP-IPMs and hybrid gate drivers. These converters accept input voltages of 140VDC to 380VDC allowing them to operate directly from rectified AC line voltages of 100VAC to 240VAC. The M57182N-315 provides a 200mA regulated 15V DC output. The M57184N-715 supplies a 350mA, 15 VDC output and a 200mA, 5V DC output. Photographs of the M57182N-315 and M57184N-715 are shown in Figure

1. Each circuit is configured in a compact SIP (Single In-line Package) to allow efficient layout with minimum printed circuit board space.

(2) Basic Circuit for the M57182N-315

required to complete the circuit. A 10µF 450V low impedance type electrolytic capacitor is connected between pins 1 and 6 to provide decoupling for the input voltage. For effective high frequency decoupling the capacitor should be located as close as possible to the hybrid circuit and connected with short traces. The output voltage is filtered by connecting a 220µF 50V low impedance electrolytic from pin 12 to common. Like the input decoupling capacitor, this capacitor should also be connected with short traces to the hybrid circuit. A 1mH, 500mA inductor connected between pins 8 and 10 completes the circuit. The selection and characteristics of this inductor will be discussed in detail in Section (4). Pin 3 of the M57182N-315 is used for factory testing purposes. Do not connect any external circuits to this pin.

Figure 1a: M57182N-315

Figure 2 shows the basic application circuit for M57182N-315. Only three external components are

Figure 2: M57182N-315 Basic Circuit

Figure 1b: M57184N-715

M57182N-315

1 3 6 8 10 12

140-400

F 450V

VDC

1mH

220µF 50V

(+15V, 200mA)

Common

(3) Basic Circuit for the M57184N-715

(

)

Figure 3 shows the basic application circuit for M57184N-715. Only four external components are required to complete the circuit. A 10µF 450V low impedance type electrolytic capacitor is connected between pins 1 and 4 to provide decoupling for the input voltage. For effective high frequency decoupling this capacitor should be located as close as possible to the hybrid circuit and connected with short traces. The output voltages are filtered by connecting a 220µF 50V low impedance electrolytic from pin 10 to common and a 100µF 50V low impedance

Figure 3: M57184N-715 Basic Circuit electrolytic from pin 18 to common. The +15V output on pin 10 is connected to the input of the +5V regulator at pin 12. Like the input decoupling capacitor, these capacitors should also be connected with short traces to the hybrid circuit. A 1mH, 500mA inductor connected between pins 6 and 8 completes the circuit. The selection and characteristics of this inductor will be discussed in detail in Section (4). Pin 16 of

1 4 6 8 10 12 14 16 18

140-400

VDC

450V

M57184N-715

1mH

220µF

50V

100µF

50V

VO-1

+15V, 350mA

-2

(+5V, 200mA)

Common

the M57184N-715 is used for factory testing purposes. Do not connect any external circuits to this pin.

(4) Inductor Selection for the M57184N-715 and M57184N-715

The 1mH inductor should be

50mV/div (AC-Coupled), 50µs/div

rated for at least 500mA and be free of saturation with superimposed DC. Undesirable saturation of the inductor can be detected by monitoring the ripple voltage across the filter capacitor on the +15V output. Figure 4 shows an AC coupled oscilloscope waveforms of the output ripple voltage with acceptable and unacceptable inductors. This measurement should be made using the

Good Inducto

Saturating Inductor

maximum input voltage expected in the application and the +15V output fully loaded. For the M57184N-715 the +5V

Figure 4: Output Ripple Voltage Waveforms

output should be unloaded while measuring the ripple voltage on the +15V output. Table 1 lists some acceptable inductors.

Manufacturer Part Number

Mitsumi C13-FR Series, Type #GA 102 API Delevan 4590-105K J.W. Miller 5900-102

Table 1: Example Inductors

Caution - electrical shock hazard: The M57182N-315 and M57184N-715 are non-isolated DC-DC converters.

Even though the output voltage is low (15V and 5V) their common ground potentials are directly tied to the high voltage DC input supply. All circuits connected to the output of the M57182N-315 and M57184N-715 must be treated as high voltage.

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