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UC2834のメーカーはUnitrodeです、この部品の機能は「High Efficiency Linear Regulator」です。 |
部品番号 | UC2834 |
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部品説明 | High Efficiency Linear Regulator | ||
メーカ | Unitrode | ||
ロゴ | |||
このページの下部にプレビューとUC2834ダウンロード(pdfファイル)リンクがあります。 Total 9 pages
High Efficiency Linear Regulator
UC1834
UC2834
UC3834
FEATURES
• Minimum VIN - VOUT Less Than
0.5V At 5A Load With External
Pass Device
• Equally Usable For Either Positive
or Negative Regulator Design
• Adjustable Low Threshold Current
Sense Amplifier
• Under And Over-Voltage Fault Alert
With Programmable Delay
• Over-Voltage Fault Latch With
100mA Crowbar Drive Output
DESCRIPTION
The UC1834 family of integrated circuits is optimized for the design of low
input-output differential linear regulators. A high gain amplifier and 200mA
sink or source drive outputs facilitate high output current designs which use
an external pass device. With both positive and negative precision refer-
ences, either polarity of regulator can be implemented. A current sense am-
plifier with a low, adjustable, threshold can be used to sense and limit
currents in either the positive or negative supply lines.
In addition, this series of parts has a fault monitoring circuit which senses
both under and over-voltage fault conditions. After a user defined delay for
transient rejection, this circuitry provides a fault alert output for either fault
condition. In the over-voltage case, a 100mA crowbar output is activated.
An over-voltage latch will maintain the crowbar output and can be used to
shutdown the driver outputs. System control to the device can be accom-
modated at a single input which will act as both a supply reset and remote
shutdown terminal. These die are protected against excessive power dissi-
pation by an internal thermal shutdown function.
BLOCK DIAGRAM
6/94
1 Page UC1834
UC2834
UC3834
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA=−55°C to +125°C
for the UC1834, −40°C to +85°C for the UC2834, and 0°C to +70°C for the
UC3834. VIN+ = 15V, VIN− = 0V, TA = TJ.
PARAMETER
TEST CONDITIONS
UC1834
UC2834
UC3834
UNITS
MIN TYP MAX MIN TYP MAX
Turn-on Characteristics
Standby Supply Current
5.5 7
5.5 10 mA
+1.5 Volt Reference
Output Voltage
TJ = 25°C
1.485 1.5 1.515 1.47 1.5 1.53 V
Line Regulation
TJ(MIN) ≤ TJ ≤ TJ(MAX)
VIN+ = 5 to 35V
1.47
1.53 1.455
1.545
1 10
1 15 mV
Load Regulation
IOUT = 0 to 2mA
1 10
1 15 mV
-2.0 Volt Reference (Note 2)
Output Voltage (Referenced
to VIN+)
Line Regulation
Output Impedance
TJ = 25°C
TJ(MIN) ≤ TJ ≤ TJ(MAX)
VIN+ = 5 to 35V
−2.04 −2 −1.96 −2.06 −2 −1.94 V
−2.06
−1.94 −2.08
−1.92
1.5 15
1.5 20 mV
2.3 2.3 kΩ
Error Amplifier Section
Input Offset Voltage
Input Bias Current
Input Offset Current
VCM = 1.5V
VCM = 1.5V
VCM = 1.5V
16
−1 −4
0.1 1
1 10 mV
−1 −8 µA
0.1 2 µA
Small Signal Open Loop Gain Output @ Pin 14, Pin 12 = VIN+
Pin 13, 20Ω to VIN−
50 65
50 65
dB
CMRR
PSRR
VCM = 0.5 to 33V, VIN+ = 35V
VIN+ = 5 to 35V, VCM = 1.5V
60 80
70 100
60 80
70 100
dB
dB
Driver Section
Maximum Output Current
200 350
200 350
mA
Saturation Voltage
Output Leakage Current
Shutdown Input Voltage
at Pin 14
Shutdown Input Current
at Pin 14
IOUT = 100mA
0.5 1.2
0.5 1.5 V
Pin 12 = 35V, Pin 13 = VIN−, Pin 14 = VIN−
0.1 50
0.1 50 µA
IOUT ≤ 100µA, Pin 13 = VIN−, Pin 12 =
VIN+
0.4 1
0.4 1
V
Pin 14 = VIN−, Pin 12 = VIN+
IOUT ≤ 100µA, Pin 13 = VIN−
−100 −150
−100 −150 µA
Thermal Shutdown (Note 3)
165 165 °C
Fault Amplifier Section
Under- and Over-Voltage
Fault Threshold
VCM = 1.5V, @ E/A Inputs
120 150 180 110 150 190 mV
Common Mode Sensitivity
Supply Sensitivity
Fault Delay
VIN+ = 35V, VCM = 1.5 to 33V
VCM = 1.5V, VIN+ = 5 to 35V
−0.4 −0.8
−0.4 −1.0 %/v
−0.5 −1.0
−0.5 −1.2 %/V
30 45 60 30 45 60 ms/µF
Fault Alert Output Current
25
25
mA
Fault Alert Saturation Voltage IOUT = 1mA
0.2 0.5
0.2 0.5 V
O.V. Latch Output Current
24
24
mA
O.V. Latch Saturation Voltage IOUT = 1mA
1.0 1.3
1.0 1.3 V
O.V. Latch Output Reset
Voltage
0.3 0.4 0.6 0.3 0.4 0.6 V
Crowbar Gate Current
−100 −175
−100 −175
mA
Crowbar Gate Leakage
Current
VIN+ = 35V, Pin 16 = VIN−
−0.5 −50
−0.5 −50 µA
Note 2: When using both the 1.5V and −2.0V references the current out of pin 3 should be balanced by an equivalent current into
Pin 2. The −2.0V output will change −2.3mV per µA of imbalance.
Note 3: Thermal shutdown turns off the driver. If Pin 15 (O.V. Latch Output) is tied to Pin 14 (Compensation/Shutdown) the
O.V. Latch will be reset.
3
3Pages TYPICAL APPLICATIONS
5-10 Amp Positive Regulator
UC1834
UC2834
UC3834
5-10 Amp Negative Regulator
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
6
6 Page | |||
ページ | 合計 : 9 ページ | ||
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PDF ダウンロード | [ UC2834 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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