KA350 [FAIRCHILD]

3-Terminal 3A Positive Adjustable Voltage Regulator; 三端3A正，可调式稳压器


型号：	KA350
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	3-Terminal 3A Positive Adjustable Voltage Regulator 三端3A正，可调式稳压器稳压器
文件：	总8页 (文件大小：124K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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KA350

3-Terminal 3A Positive Adjustable Voltage

Regulator

Features

Description

• Output adjustable between 1.2V and 33V

• Guaranteed 3A output current

• Internal thermal over load protection

• Load regulation (Typ: 0.1%)

The KA350 is an adjustable 3-terminal positive voltage

regulator capable of supplying in excess of 3.0 A over an

output voltage range of 1.2V to 33 V

TO-220

• Line regulation (Typ: 0.015%/V)

• Internal short circuit current limit

• Output transistor safe area compensation

1. Adj 2. Output 3. Input

Internal Block Diagram

Rev. 1.0.0

KA350

Absolute Maximum Ratings

Parameter

Symbol

V - V

Value

Unit

Input Output Voltage Differential

Lead Temperature (Soldering, 10sec)

Power Dissipation

300

°C

LEAD

Internally limited

0 ~ +125

-65 ~ +150

Operating Temperature Range

Storage Temperature Range

OPR

°C

STG

Electrical Characteristics

(V -V =5V, I =1.5A, T =0°C to + 125°C; P ≤ P

, unless otherwise specified)

DMAX

Parameter

Symbol

Min. Typ. Max.

Unit

Conditions

Line Regulation (Note1)

Load Regulation (Note1)

Adjustment Pin Current

Rline

T = +25°C, 3V ≤ V -V ≤ 35V

0.015 0.03

%/V

T = +25 °C, 3V ≤ V -V ≤ 35V

Rload

≤ 5V

≥ 5V

0.1

0.5

100

5.0

µA

ADJ

Adjustment Pin Current

Change

3V ≤ V -V ≤ 35V,

0.2

∆I

ADJ

10mA ≤ I ≤ 3A, P ≤ P

MAX

Thermal Regulation

Reference Voltage

Line Regulation

REG

Pulse = 20ms, T =+ 25°C

0.002

%/W

REF

3V ≤ V -V ≤ 35V, 10mA ≤ I ≤ 3A,P ≤ 30W 1.2 1.25 1.30

I O O D

Rline

3.0V ≤ V -V ≤ 35V

0.02 0.07

%/W

10mA ≤ I ≤ 3.0A

Load Regulation

≤ 5.0V

≥ 5.0V

0.3

1.5

Rload

Temperature Stability

T = 0°C to + 125°C

1.0

4.5

Maximum Output

Current

V -V ≤ 10V, P ≤ P

3.0

MAX

V -V = 30V, P ≤ P ,T = +25°C

MAX A

o(MAX)

0.25 1.0

Minimum Load Current

V -V = 35V

3.5

L(MIN)

RMS Noise, %of V

10Hz ≤ f ≤ 10KHz, T = +25 °C

0.003

%/V

OUT

= 10V, f = 120Hz,

Ripple Rejection

= 0

= 10µF

ADJ

Long-Term Stability

T =+125 °C

0.3

1000HR

Note:

1. Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken

into account separately. Pulse testing with low duty cycle is used.

KA350

Typical Perfomance Characteristics

Figure 1. Load Regulation

Figure 2. Current Limit

Figure 3. Adjustment Pin Current

Figure 4. Dropout Voltage

Figure 5. Temperature Stability

Figure 6. Minimum Load Current

KA350

Typical Perfomance Characteristics (continued)

Figure 7. Ripple Rejection vs Vo

Figure 8. Ripple Rejection vs Io

Figure 9. Ripple Rejection vs Frequency

Figure 10. Output Impedance

Figure 11. Line Transient Response

Figure 12. Load Transient Response

KA350

Typical Application

Input

Output

Figure 13.

C : C is required if the regulator is located an appreciable distance from power supply filter.

: Output capacitors in the range of 1µF to 100µF of aluminum or tantalum capacitor are commonly used to provide

improved output impedance and rejection of transients.

In operation, the KA350 develops a nominal 1.25V reference voltage, V , between the output and adjustment terminal. The

REF

reference voltage is impressed across program resistor R and, since the voltage is constant, a constant current I then flows

through the output set resistor R , giving an output voltage of

= 1.25V(1+R /R ) + I

ADJ 2

Since I

current (less than 100µF) from the adjustment terminal represents an error term, the KA350 was designed to mini-

ADJ

mize I

and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the

ADJ

output establishing a minimum load current requirement. If there is insufficient load on the output, the output voltage will rise.

Since the KA350 is a floating regulator, it is only the voltage differential across the circuit which is important to performance,

and operation at high voltage with respect to ground is possible.

Since I

ADJ

is controlled to less than 100µA, the error associated with this term is negligible in most applications.

KA350

Mechanical Dimensions ^(Continued)

Package

TO-220

4.50 ±0.20

9.90 ±0.20

(8.70)

+0.10

–0.05

1.30

ø3.60 ±0.10

1.27 ±0.10

1.52 ±0.10

0.80 ±0.10

+0.10

–0.05

0.50

2.40 ±0.20

2.54TYP

[2.54 ±0.20]

10.00 ±0.20

KA350

Ordering Information

Product Number

Package

TO-220

Operating Temperature

KA350

0°C to + 125°C

KA350

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY

PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY

LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER

DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES

OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body,

or (b) support or sustain life, and (c) whose failure to

perform when properly used in accordance with

instructions for use provided in the labeling, can be

reasonably expected to result in a significant injury of the

user.

2. A critical component in any component of a life support

device or system whose failure to perform can be

reasonably expected to cause the failure of the life support

device or system, or to affect its safety or effectiveness.

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2001 Fairchild Semiconductor Corporation

KA350 [FAIRCHILD]

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