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Спецификация NTE953 изготовлена «NTE Electronics» и имеет функцию, называемую «Linear Integrated Circuit 4-Terminal Positive Adjustable Voltage Regulator». |
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Детали детали
Номер произв | NTE953 |
Описание | Linear Integrated Circuit 4-Terminal Positive Adjustable Voltage Regulator |
Производители | NTE Electronics |
логотип |
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NTE953
Linear Integrated Circuit
4–Terminal Positive Adjustable Voltage Regulator
Description:
The NTE953 4–Terminal adjustable voltage regulator is designed to deliver continuous load currents
of up to 1.0A with a maximum input voltage of +40V. Output current capability can be increased to
greater than 1.0A through the use of one or more external transistors. The output voltage range is
5V to 30V. For systems requiring both a positive and negative, the NTE953 and NTE954 are excellent
for use as a dual tracking regulator with appropriate external circuitry.
Features:
D Output Current in Excess of 1A
D Positive Output 5V to 30V
D Internal Thermal Overload Protection
D Internal Short Circuit Protection
D Output Transistor Safe–Area Protection
D Power Watt Package
Absolute Maximum Ratings:
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Control Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 ≤ V ≤ VOUT
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (During soldering, 10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +230°C
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Electrical Characteristics: (–0°C ≤ TJ ≤ 125°C, VIN = 10V, IOUT = 500mA, CIN = 0.33µF,
COUT = 0.1µF, unless otherwise specified.)
Parameter
Test Conditions (Note 1, Note 3)
Min Typ Max Unit
Input Voltage Range
Output Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Control Pin Current
TJ = 25°C
VIN = VOUT +5V
VOUT +3V ≤ VIN ≤ VOUT +15V, TJ = 25°C
5mA ≤ IOUT ≤ 1.0A,
PD ≤ 15W, VIN (max) = 38V
TJ = 25°C, VOUT ≤ 10V,
(VOUT 2.5V) ≤ VIN ≤ (VOUT +20V)
TJ = 25°C, VOUT ≥ 10V,
(VOUT +3V) ≤ VIN ≤ (VOUT +15V)
(VOUT +3V) ≤ VIN ≤ (VOUT +7V)
TJ = 25°C,
250mA ≤ IOUT ≤ 750mA
VIN = VOUT +5V 5mA ≤ IOUT ≤ 1.5A
TJ = 25°C
7.5
5.0
–
–
–
–
–
–
–
–
–
– 40
V
– 30
V
– 4.0 %(VOUT)
– 5.0 %(VOUT)
%(VOUT)
– 1.0
%(VOUT)
– 0.75
– 0.67
– 1.0 %(VOUT)
– 2.0 %(VOUT)
1.0 5.0
µA
– 8.0
µA
Quiescent Current
TJ = 25°C
– 3.2 5.0
– – 6.0
µA
µA
Ripple Rejection
Output Noise Voltage
Dropout Voltage
8V ≤ VIN ≤ 18V, VOUT = 5V, f = 120Hz
TJ = 25°C, 10Hz ≤ f ≤ 100kHz,
VOUT = 5V, IOUT = 5mA
Note 2
62 78 –
dB
– 8 40 µV/VOUT
– – 2.5
V
Short Circuit Current
Peak Output Current
Average Temperature
Coefficient of
Output Voltage
TJ = 25°C, VIN = 30V
TJ = 25°C
VOUT = 5V,
IOUT = 5mA
TJ = –55°C to +25°C
TJ = +25°C to +150°C
– 0.75 1.2
A
1.3 2.2 3.3
A
– – 0.4 mV/°C/
VOUT
– – 0.3
Control Pin Voltage
(Reference)
TJ = 25°C
4.8 5.0 5.2
4.75 – 5.25
V
V
Note 1. VOUT is defined as:
VOUT =
R1 + R2
(5.0)
R2
Note 2. Dropout Voltage is defined as that input–output voltage differential which causes the output
voltage to decrease by 5% of its initial value.
Note 3. All characteristics except noise voltage and ripple rejection ratio are measured using pulse
techniques (tW ≤ 10ms, duty cycle ≤ 5%). Output voltage changes due to changes in internal
temperature must be taken into account separately.
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Design Considerations:
The NTE953 adjustable voltage regulator has an output voltage which varies from VCONTROL to typically
(R1 + R2)
VIN –2V by VOUT = VCONTROL
R2
The nominal reference in the NTE953 is 5.0V. If we allow 1.0mA to flow in the control string to elimi-
nate bias current effects, we can make R2 = 2.2kΩ. The output voltage is then:
VOUT = (R1 + R2)V, where R1 and R2 are in kΩs.
Example: If R2 = 5kΩ and R1 = 10kΩ then
VOUT = 15V nominal
By proper wiring of the feedback resistors, load regulation of the device can be improved significantly.
The NTE953 voltage regulator contains thermal–overload protection from excessive power, internal
short–circuit protection which limits each circuit’s maximum current, and output transistor safe–area
protection for reducing the output current as the voltage across each pass transistor is increased.
Although the internal power dissipation is limited, the junction temperature must be kept below the
maximum specified temperature in order to meet data sheet specifications. To calculate the maxi-
mum junction temperature or heat sink required, the following thermal resistance values should be
used:
Typ
°C/W
Max
°C/W
Typ
°C/W
Max
°C/W
ΘJC
ΘJC
ΘJA
ΘJA
7.5 11 75 80
Solving for TJ:
PD(max) =
TJ(max) – TA or TJ(max) – TA
ΘJC + ΘCA
ΘJA
(Without a heat sink)
ΘCA = ΘCS + ΘSA
TJ = TA + PD (ΘJC + ΘCA) or
TA + PD ΘJA (Without heat sink)
Where:
TJ =
TA =
PD =
ΘJA =
ΘJC =
ΘCA =
ΘCS =
ΘSA =
Junction Temperature
Ambient Temperature
Power Dissipation
Junction to Ambient Thermal Resistance
Junction to Case Thermal Resistance
Case to Ambient Thermal Resistance
Case to Heat Sink Resistance
Heat Sink to Ambient Thermal Resistance
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