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52149

NEGATIVE ADJUSTABLE 5-AMP VOLTAGE REGULATOR

Micropac Industries 

52149/52174

NEGATIVE ADJUSTABLE 5-AMP, VOLTAGE REGULATOR

ELECTRICAL CHARACTERISTICS

TJ = 25ºC, VIN = -10V and IOUT = -2.0A unless otherwise specified

PARAMETER

TEST CONDITIONS

Output Voltage Range

Nominal Output Voltage Range

Output Voltage Tolerance

Line Regulation

Load Regulation

Control Pin Current

Quiescent Current

Ripple Rejection

Output Noise Voltage

Dropout Voltage

Short-Circuit Current Limit

Control Pin voltage (Reference)

VIN = VOUT -5V

40V ≤ VIN ≤ -7V

40V ≤ VIN ≤ -7V

VIN = VOUT -10V

-10mA ≤ IOUT ≤ -5.0A

VIN = -10V

-18V ≤ VIN ≤ -8.5V

VOUT = -5V, f = 120 Hz

VOUT = -5V, 10 Hz ≤ f ≤ 100kHz

IOUT = -5A @ -0.95 VOUT

VIN = -15V

VIN = -10V

MIN

TYP

-7.0

2.55

0.4

0.7

50

200

-2.2

8

-2.65

MAX

-35

24

4

1.0

1.0

3.0

7.0

12

-2.45

UNIT

V

V

% (VOUT)

% (VOUT)

% (VOUT)

µA

mA

dB

µV

V

A

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

TO-3

θJC

Typical

1.8

Max

2.5

Where:

PD = Power Dissipation

TJ = Junction Temperature

TA = Ambient Temperature

θCS = Case-to-heat sink thermal resistance

θJC = Junction-to-case thermal resistance

PD(MAX) = TJ(MAX) – TA

θCA = θCS + θSA

θJC + θCA

Solving for TJ = TA + PD (θJC + θCA)

θCA = Case-to-ambient thermal resistance

θSA = Heat sink-to-ambient thermal resistance

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

VOUT = VCONTROL R1 + R2

VOUT = -2.55 V nominal,

R2

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

VOUT = -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 • (972) 272-3571 • Fax (972) 494-2281

www.micropac.com E-MAIL: hybridsales@micropac.com 12/12/01

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