UC3834DWTR_技术文档

UC1834

UC2834

UC3834

High Efficiency Linear Regulator

FEATURES

DESCRIPTION

•

Minimum VIN - VOUT Less Than

0.5V At 5A Load With External

Pass Device

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.

•

Equally Usable For Either Positive

or Negative Regulator Design

Adjustable Low Threshold Current

Sense Amplifier

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.

Under And Over-Voltage Fault Alert

With Programmable Delay

Over-Voltage Fault Latch With

100mA Crowbar Drive Output

BLOCK DIAGRAM

6/94

UC1834

UC2834

UC3834

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage, V_IN+ . . . . . . . . . . . . . . . . . . . . . . . . . 40V

Driver Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mA

Driver Source to Sink Voltage . . . . . . . . . . . . . . . . . . . . . . . 40V

Crowbar Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −200mA

+1.5V Reference Output Current . . . . . . . . . . . . . . . . . . −10mA

Fault Alert Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V

Fault Alert Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA

Error Amplifier Inputs . . . . . . . . . . . . . . . . . . . . . . −0.5V to 35V

Current Sense Inputs . . . . . . . . . . . . . . . . . . . . . . −0.5V to 40V

O.V. Latch Output Voltage . . . . . . . . . . . . . . . . . . −0.5V to 40V

O.V. Latch Output Current . . . . . . . . . . . . . . . . . . . . . . . . 15mA

Power Dissipation at TA = 25°C . . . . . . . . . . . . . . . . . . 1000mW

Power Dissipation at TC = 25°C. . . . . . . . . . . . . . . . . . 2000mW

Operating Junction Temperature. . . . . . . . . . −55°C to +150°C

Storage Temperature. . . . . . . . . . . . . . . . . . . −65°C to +150°C

Lead Temperature (soldering, 10 seconds). . . . . . . . . . . 300°C

Note 1: Voltages are reference to VIN−, Pin 5.

Currents are positive into, negative out of the specified

terminals.

Consult Packaging section of Databook for thermal

limitations and considerations of package.

CONNECTION DIAGRAMS

PLCC-20, LCC-20 (TOP VIEW)

Q, L Packages

DIL-16, SOIC-16 (TOP VIEW)

J or N Package, DW Package

PACKAGE PIN FUNCTION

FUNCTION

1

N/C

VIN +

2

−2.0V REF

+1.5V REF

Threshold Adjust

N/C

3

4

5

6

VIN−

7

Sense−

8

Sense+

9

N.Inv. Input

N/C

10

11

12

13

14

15

16

17

Inv. Input

Fault Alert

Fault Delay

Driver Sink

N/C

Driver Source

Compensation/ Shutdown 18

O.V. Latch Output/Reset

Crowbar Gate

19

20

2

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.

UC1834

UC2834

UC3834

UNITS

PARAMETER

TEST CONDITIONS

MIN

TYP MAX MIN

TYP MAX

Turn-on Characteristics

Standby Supply Current

+1.5 Volt Reference

5.5

7

5.5

1.5

10

mA

V

Output Voltage

TJ = 25°C

1.485 1.5 1.515 1.47

1.53

1.545

15

TJ(MIN ≤ TJ ≤ TJ(MAX)

1.47

1.53 1.455

)

Line Regulation

VIN+ = 5 to 35V

IOUT = 0 to 2mA

1

10

1

mV

Load Regulation

15

-2.0 Volt Reference (Note 2)

Output Voltage (Referenced TJ = 25°C

−2.04

−2.06

−2

−1.96 −2.06

−1.94 −2.08

15

−2

−1.94

−1.92

20

V

+

to VIN )

TJ(MIN) ≤ TJ ≤ TJ(MAX)

Line Regulation

VIN+ = 5 to 35V

1.5

2.3

1.5

2.3

mV

Output Impedance

Error Amplifier Section

Input Offset Voltage

Input Bias Current

Input Offset Current

kΩ

VCM = 1.5V

1

6

−4

1

10

−8

2

mV

µA

dB

−1

0.1

65

−1

0.1

65

Small Signal Open Loop Gain Output @ Pin 14, Pin 12 = VIN+

50

Pin 13, 20Ω to VIN−

CMRR

VCM = 0.5 to 33V, V_IN+ = 35V

VIN+ = 5 to 35V, VCM = 1.5V

60

70

80

60

70

80

dB

PSRR

100

Driver Section

Maximum Output Current

Saturation Voltage

Output Leakage Current

200

0.4

350

0.5

0.1

1

200

350

0.5

0.1

1

mA

V

IOUT = 100mA

1.2

50

1.5

50

Pin 12 = 35V, Pin 13 = VIN−, Pin 14 = VIN−

µA

V

Shutdown Input Voltage

at Pin 14

IOUT ≤ 100µA, Pin 13 = VIN−, Pin 12 =

VIN+

0.4

Shutdown Input Current

at Pin 14

Pin 14 = VIN−, Pin 12 = VIN+

IOUT ≤ 100µA, Pin 13 = VIN−

−100 −150

µA

Thermal Shutdown (Note 3)

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

VIN+ = 35V, VCM = 1.5 to 33V

VCM = 1.5V, VIN+ = 5 to 35V

−0.4 −0.8

−0.5 −1.0

−0.4 −1.0

−0.5 −1.2

%/v

%/V

Fault Delay

30

2

45

5

60

30

2

45

5

60 ms/µF

Fault Alert Output Current

mA

Fault Alert Saturation Voltage IOUT = 1mA

O.V. Latch Output Current

0.2

4

0.5

0.2

4

0.5

V

mA

V

2

O.V. Latch Saturation Voltage IOUT = 1mA

1.0

0.4

1.3

0.6

1.0

0.4

1.3

0.6

O.V. Latch Output Reset

Voltage

0.3

V

Crowbar Gate Current

−100 −175

−0.5

−100 −175

−0.5

mA

Crowbar Gate Leakage

Current

VIN+ = 35V, Pin 16 = VIN−

−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

UC1834

UC2834

UC3834

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

ELECTRICAL CHARACTERISTICS:

UC1834

UC2834

UC3834

UNITS

PARAMETER

TEST CONDITIONS

MIN

TYP MAX MIN

TYP MAX

Current Sense Amplifier Section

Threshold Voltage

Pin 4 Open, VCM = VIN+ or VIN−

Pin 4 = 0.5V, V_CM= VIN+ or VIN−

130

40

150

50

170

60

120

30

150

50

180

70

mV

Threshold Supply Sensitivity Pin 4 Open, VCM = VIN−, VIN+ = 5 to 35V

−0.1 −0.3

−0.1 −0.5

%/V

µA

Adj. Input Current

Pin 4 = 0.5V

VCM = VIN+

VCM = VIN−

−2

−10

−2

−10

Sense Input Bias Current

100

200

100

200

µA

−100 −200

Current Sense Threshold Adjustment

Current Limiting Knee Characteristics

Differential Voltage at Current Sense

Inputs - mV (reference to sense − input)

Error Amplifier Gain and Phase

Frequency Response

Current Sense Amplifier Gain and Phase

Frequency Response

4

UC1834

UC2834

UC3834

APPLICATION INFORMATION

Foldback Current Limiting

Both the current sense and error amplifiers on the UC1834 The crowbar output on the UC1834 is activated following a

are transconductance type amplifiers. As a result, their volt- sustained over-voltage condition. The crowbar output remains

age gain is a direct function of the load impedance at their high as long as the fault condition persists, or, as long as the

shared output pin, Pin 14. Their small signal voltage gain as over-voltage latch is set. The latch is set with an over-voltage

a function of load and frequency is nominally given by;

fault if the voltage at Pin 15 is above the latch reset threshold,

typically 0.4V. When the latch is set, its Q− output will pull Pin

15 low through a series diode. As long as a nominal pull-up

load exists, the series diode prevents Q− from pulling Pin 15

below the reset threshold. However, Pin 15 is pulled low

enough to disable the driver outputs if Pins 15 and 14 are

tied together. With Pin 15 and 14 common, the regulator

will latch off in response to an over-voltage fault. If the

fault condition is cleared and Pins 14 and 15 are momen-

tarily pulled below the latch reset threshold, the driver out-

puts are re-enabled.

ZL (f)

70Ω

AV E ⁄ A =

and AV C. S. ⁄ A =

700Ω

for: f ≤ 500kHz and |ZL(f)| ≤ 1 MΩ

Where:

AV=Small Signal Voltage Gain to pin 14.

ZL(f) = Load Impedance at Pin 14.

The UC1834 fault delay circuitry prevents the fault outputs

from responding to transient fault conditions. The delay reset

latch insures that the full, user defined, delay passes before an

over-voltage fault response occurs. This prevents unnecessary

crowbar, or latched-off conditions, from occurring following

sharp under-voltage to over-voltage transients.

Setting the Threshold Adjust Voltage (VADJ)

5

UC1834

UC2834

UC3834

TYPICAL APPLICATIONS

5-10 Amp Positive Regulator

5-10 Amp Negative Regulator

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603) 424-3460

6

PACKAGE OPTION ADDENDUM

www.ti.com

4-Nov-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

LCCC

CDIP

LCCC

CDIP

LCCC

SOIC

Drawing

5962-87742012A

5962-8774201EA

5962-8774201V2A

5962-8774201VEA

UC1834J

ACTIVE

OBSOLETE

ACTIVE

FK

J

20

16

20

16

20

16

1

TBD

POST-PLATE Level-NC-NC-NC

A42 SNPB

Call TI

Level-NC-NC-NC

Call TI

FK

J

Call TI

J

A42 SNPB

Call TI

UC1834J/81025

UC1834J883B

UC1834JQMLV

UC1834L

J

1

A42 SNPB

Call TI

Level-NC-NC-NC

Call TI

J

FK

DW

1

POST-PLATE Level-NC-NC-NC

UC1834L883B

UC1834LQMLV

UC2834DW

Call TI

40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

UC2834DWG4

UC2834DWTR

ACTIVE

SOIC

DW

16

40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

UC2834DWTRG4

2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

UC2834J

UC2834N

ACTIVE

CDIP

PDIP

J

16

1

TBD

A42 SNPB

Level-NC-NC-NC

N

25 Green (RoHS & CU NIPDAU Level-NC-NC-NC

no Sb/Br)

UC2834NG4

ACTIVE

PDIP

N

16

25 Green (RoHS & CU NIPDAU Level-NC-NC-NC

no Sb/Br)

UC2834Q

UC2834QTR

UC3834DW

ACTIVE

PLCC

SOIC

FN

20

16

46

TBD

Call TI

Level-2-220C-1 YEAR

1000

DW

40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

UC3834DWG4

UC3834DWTR

ACTIVE

SOIC

DW

16

40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

UC3834DWTRG4

2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

UC3834J

UC3834N

ACTIVE

CDIP

PDIP

J

16

1

TBD

A42 SNPB

Level-NC-NC-NC

N

25 Green (RoHS & CU NIPDAU Level-NC-NC-NC

no Sb/Br)

UC3834NG4

ACTIVE

PDIP

N

16

25 Green (RoHS & CU NIPDAU Level-NC-NC-NC

no Sb/Br)

UC3834Q

ACTIVE

PLCC

FN

20

46

TBD

Call TI

Level-2-220C-1 YEAR

UC3834QTR

1000

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

4-Nov-2005

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

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and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

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solutions:

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amplifier.ti.com

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dataconverter.ti.com

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dsp.ti.com

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Digital Control

Military

www.ti.com/broadband

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interface.ti.com

logic.ti.com

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power.ti.com

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microcontroller.ti.com

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www.ti.com/wireless

Mailing Address:

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Post Office Box 655303 Dallas, Texas 75265


型号：	UC3834DWTR
厂家：	TEXAS INSTRUMENTS
描述：	High Efficiency Linear Regulator 高英法fi效率线性稳压器稳压器
文件：	总9页 (文件大小：676K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UC3834DWTR [TI]

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