MII 52174, 52149 Datasheet

52149/52174

79HG REPLACEMENT

NEGATIVE ADJUSTABLE 5-AMP
VOLTAGE REGULATOR

Mii

HYBRID MICROELECTRONICS

PRODUCTS DIVISION

Features:

• Replacement for 79HG

• 5.0A Output Current

• Internal Current And Thermal Overload Protection

• Internal Short Circuit Current Limit

• Low Drop-Out Voltage (Typically -2.2 V @ 5.0 A)

• 50W Power Dissipation

• Electrically Isolated Case

• Steel TO-3 Case

ORDER INFORMATION

52149 Standard
52174 MIL-STD-883 Screened

DESCRIPTION

The 52149/52174, which is a replacement for the 79HG, is an adjustable 4-terminal voltage regulator capable of supplying in
excess of 5 A over a –24 V to -2.55 V output range. This Hybrid Voltage Regulator has been designed with all the inherent
characteristics of the monolithic 4-terminal regulator; i.e., full thermal overload and short circuit protection. It is packaged in a
hermetically sealed 4-pin, TO-3 package providing 50W power dissipation. The regulator consists of a monolithic chip
driving a discrete series-pass element and short circuit detection transistors.

Applications:

• Designed for use in general purpose applications
where adjustability is advantageous.

• Military and Hi Rel Industrial applications where
hermeticity is required.

ABSOLUTE MAXIMUM RATINGS

Input Voltage.........................................................................................................................................................................-35 V

Internal Power Dissipation @T

Maximum Input-to-Output Voltage Differential...................................................................................................................... 35 V

Operating Junction Temperature ....................................................................................................................................... 150

Storage Temperature Range..............................................................................................................................-55

Pin Temperature (Soldering, 60 seconds) ......................................................................................................................... 300

Commercial Temperature Range 52149 .............................................................................................................. 0

Military Temperature Range 52174....................................................................................................................-55

Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.

Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible.

MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION • 905 E. Walnut St., Garland, TX 75040 • [phone] • Fax [phone]

= 25°C

c

...............................................................................................................................50W

www.micropac.com E-MAIL: [e-mail]

12/12/01

C to +150°C

°

C to +125°C

°

C to +125°C

°

°

°

C

C

1

NEGATIVE ADJUSTABLE 5-AMP, VOLTAGE REGULATOR

ELECTRICAL CHARACTERISTICS

52149/52174

TJ = 25ºC, V

= -10V and I

IN

= -2.0A unless otherwise specified

OUT

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output Voltage Range -7.0 -35 V

Nominal Output Voltage Range V
Output Voltage Tolerance 40V ≤ V
Line Regulation 40V ≤ V
Load Regulation V

Control Pin Current 3.0
Quiescent Current V
Ripple Rejection -18V ≤ VIN ≤ -8.5V

Output Noise Voltage V

OUT

Dropout Voltage I

= V

IN

IN

-10mA ≤ I

-5V 2.55 24 V

OUT

≤

-7V 4 % (V

IN

≤

-7V 0.4 1.0 % (V

IN

= V

-10V

OUT

≤

-5.0A

OUT

= -10V 7.0 mA

IN

0.7 1.0 % (V

50 dB

V

= -5V, f = 120 Hz

OUT

= -5V, 10 Hz ≤ f ≤ 100kHz 200

= -5A @ -0.95 V

OUT

OUT

-2.2 V

OUT)

OUT)

OUT)

µ

A

µ

V

Short-Circuit Current Limit VIN = -15V 8 12 A
Control Pin voltage (Reference) VIN = -10V -2.65 -2.45 V

DESIGN CONSIDERATIONS

This device has thermal overload protection from excessive power and internal short circuit protection, which limits the circuit’s maximum
current. Thus, the device is protected from overload abnormalities. Although the internal power dissipation is limited, the junction
temperature must be kept below the maximum specified temperature (150ºC). It is recommended, by the manufacturer, that the maximum
junction temperature be kept as low as possible for increased reliability. To calculate the maximum junction temperature or heat sink
required, the following thermal resistance values should be used.

Package

Typical Max

TO-3 1.8 2.5

Where: T

T

= Power

P

D

Dissipation θCS

= Junction Temperature

J

= Ambient Temperature

A

= Case-to-heat sink thermal resistance

θ

= Junction-to-case thermal resistance

JC

θ

JC

= T

P

D(MAX)

J(MAX)

θ

JC

– TA

θ

+

Solving for TJ = TA + PD (

θ

= Case-to-ambient thermal resistance

CA

θ

= Heat sink-to-ambient thermal resistance

SA

θ

θ

=

CA

CA

θ

+

JC

θ

+

CS

SA

θ

)

CA

The device is designed to operate without external compensation components. However, the amount of external filtering of these voltage
regulators depends upon the circuit layout. If in a specific application the regulator is more than four inches from the filter capacitor, a 2µF
solid tantalum capacitor should be used at the input. A 1µF capacitor should be used at the output to reduce transients created by fast
switching loads, as seen in the basic test circuit. These filter capacitors must be located as close to the regulator as possible.

Caution:

Permanent damage can result from forcing the output voltage higher than the input voltage. A protection diode from output to

input should be used if this condition exists.

VOLTAGE OUTPUT

The device has an adjustable output voltage from -2.55 to -24V which can be programmed by the external resistor network (potentiometer
or two fixed resistors) using the relationship:

Example: If R1 = 0Ω and R2 = 5kΩ, Then

V

OUT

= V

R1 + R2 V

CONTROL

= -2.55 V nominal,

OUT

R2 or, if R1 = 12.8 kΩ and R2 = 2.1 kΩ then
V

OUT

= -18V.

Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.

Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible.

MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION • 905 E. Walnut St., Garland, TX 75040 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

12/12/01

2