UCC3808A-1_技术文档

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ꢖ

SLUS456D – APRIL 1999 - REVISED AUGUST 2002

D OR N PACKAGE

(TOP VIEW)

D

Dual Output Drive Stages in Push-Pull

Configuration

Current Sense Discharge Transistor to

Improve Dynamic Response

1

2

3

4

8

7

6

5

VDD

COMP

OUTA

OUTB

GND

FB

CS

RC

130-µA Typical Starting Current

1-mA Typical Run Current

Operation to 1 MHz

Internal Soft Start

PW PACKAGE

(TOP VIEW)

On-Chip Error Amplifier With 2-MHz Gain

Bandwidth Product

1

8

7

6

5

OUTA

VDD

COMP

FB

OUTB

GND

RC

D

On Chip VDD Clamping

2

3

4

D

Output Drive Stages Capable of 500-mA

Peak-Source Current, 1-A Peak-Sink Current

CS

description

The UCC3808A is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808A

contains all of the control and drive circuitry required for off-line or dc-to-dc fixed frequency current-mode switching

power supplies with minimal external parts count.

The UCC3808A dual output drive stages are arranged in a push-pull configuration. Both outputs switch at half the

oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to 200 ns

depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle to less than

50%.

block diagram

FB

2

COMP

1

CS

3

8

7

VDD

OVERCURRENT

COMPARATOR

22 k

Ω

PEAK CURRENT

COMPARATOR

14 V

0.75 V

2.0 V

0.5 V

2.2 V

S

OUTA

VDD OK

OSCILLATOR

Q

PWM

LATCH

R

S

R

1.2R

Q

S

Q

R

VDD–1 V

T

PWM

COMPARATOR

VDD

0.5 V

R

SOFT START

6

5

OUTB

GND

VOLTAGE

REFERENCE

SLOPE = 1 V/ms

4

Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different.

RC

UDG-00097

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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1

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ꢖ

SLUS456D – APRIL 1999 - REVISED AUGUST 2002

description (continued)

The UCC3808A family offers a variety of package options, temperature range options, and choice of undervoltage

lockout levels. The family has UVLO thresholds and hysteresis options for off-line and battery powered systems.

Thresholds are shown in the table below.

The UCC3808A is an enhanced version of the UCC3808 family. The significant difference is that the A versions

feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during the

oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle and helps minimize

filter capacitor values and current sense delay.

ORDERING INFORMATION

Packaged Devices

T

= T

J

A

UVLO Option

12.5 V/8.3 V

4.3 V/4.1 V

12.5 V/8.3 V

4.3 V/4.1 V

SOIC (D)

PDIP (N)

TSSOP (PW)

UCC2808AD–1

UCC2808AD–2

UCC3808AD–1

UCC3808AD–2

UCC2808AN–1

UCC2808AN–2

UCC3808AN–1

UCC3808AN–2

UCC2808APW–1

UCC2808APW–2

UCC3808APW–1

UCC3808APW–2

–40°C to 85°C

0°C to 70°C

†

D (SOIC–8) and PW (TSSOP–8) packages are available taped and reeled. Add TR suffix to device type (e.g.

UCC3808ADTR–1) to order quantities of 2500 devices per reel for SOIC-8 and 2000 devices per reel for TSSOP-8.

†

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

Supply voltage (IDD ≤ 10 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V

Supply current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

OUTA/OUTB source current (peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 A

OUTA/OUTB sink current (peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 A

Analog inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to VDD 0.3 V, not to exceed 6 V

Power dissipation at T = 25°C (N package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W

A

Power dissipation at T = 25°C (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW

A

Power dissipation at T = 25°C (PW package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mW

A

stg

Storage temperature, T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to150°C

Junction temperature, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 150°C

Lead temperature (soldering, 10 sec.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C

J

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Currents are positive into, negative out of the specified terminal. Consult Packaging Section of the Power Supply Control Data Book (TI Literature

Number SLUD003) for thermal limitations and considerations of packages.

†

electrical characteristics, T = 0°C to 70°C for the UCC3808A-x, –40°C to 85°C for the UCC2808A-x,

A

VDD = 10 V (see Note 6), 1-µF capacitor from VDD to GND, R = 22 kΩ, C = 330 pF T = T , (unless

A

J

otherwise noted)

PARAMETER

Oscillator Section

TEST CONDITIONS

MIN

TYP

MAX UNITS

Oscillator frequency

175

194

0.5

213

kHz

V/V

Oscillator amplitude/VDD

See Note 1

0.44

0.56

NOTES: 1. Measured at RC. Signal amplitude tracks VDD.

6. For UCCx808A–1, set VDD above the start threshold before setting at 10 V.

2

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ꢖ

SLUS456D – APRIL 1999 - REVISED AUGUST 2002

electrical characteristics, T = 0°C to 70°C for the UCC3808A-x, –40°C to 85°C for the UCC2808A-x,

A

VDD = 10 V (see Note 6), 1-µF capacitor from VDD to GND, R = 22 kΩ, C = 330 pF T = T , (unless

A

J

otherwise noted)

Error Amplifier Section

Input voltage

COMP = 2 V

1.95

–1

2

2.05

1

V

Input bias current

Open loop voltage gain

COMP sink current

COMP source current

PWM Section

µA

dB

mA

60

80

2.5

FB = 2.2 V,

FB = 1.3 V,

COMP = 1 V

0.3

–0.2

COMP = 3.5 V

–0.5

Maximum duty cycle

Minimum duty cycle

Current Sense Section

Gain

Measured at OUTA or OUTB

COMP = 0 V

48

49

50

0

%

See Note 2

1.9

2.2

0.5

2.5

0.55

200

V/V

V

Maximum input signal

CS to output delay

CS source current

CS sink current

COMP = 5 V

See Note 3

CS from 0 mV to 600 mV

0.45

COMP = 3.5 V,

100

ns

nA

mA

V

–200

5

CS = 0.5 V,

CS = 0 V

RC = 5.5 V

See Note 7

10

0.75

0.8

Over current threshold

COMP to CS offset

Output Section

0.7

0.35

0.8

1.2

V

OUT low level

I = 100 mA

0.5

25

1

V

OUT high level

I = –50 mA,

VDD – OUT

Rise time

C

= 1 nF

60

ns

L

Fall time

25

Undervoltage Lockout Section

UCCx808A–1

UCCx808A–2

UCCx808A–1

UCCx808A–2

UCCx808A–1

UCCx808A–2

See Note 6

11.5

4.1

7.6

3.9

3.5

0.1

12.5

4.3

8.3

4.1

4.2

0.2

13.5

4.5

9

V

Start threshold

Minimum operating voltage after start

Hysteresis

4.3

5.1

0.3

Soft Start Section

COMP rise time

FB = 1.8 V,

Rise from 0.5 V to 4 V

3.5

20

ms

Overall Section

Startup current

VDD < start threshold

130

1

260

2

µA

mA

V

Operating supply current

VDD zener shunt voltage

FB = 0 V,

IDD = 10 mA

COMP

CS = 0 V

See Note 4

See Note 5 and 6

13

14

15

DV

NOTES: 2. Gain is defined by: A +

,

0 ≤ V ≤ 0.4 V.

CS

DV

CS

3. Parameter measured at trip point of latch with FB at 0 V.

4. Start threshold and zener shunt threshold track one another.

5. Does not include current in the external oscillator network.

6. For UCCx808A–1, set VDD above the start threshold before setting at 10 V.

7. The internal current sink on the CS pin is designed to discharge an external filter capacitor. It is not intended to be a dc sink path.

3

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ꢖ

SLUS456D – APRIL 1999 - REVISED AUGUST 2002

pin assignments

COMP: COMP is the output of the error amplifier and the input of the PWM comparator. The error amplifier in the

UCC3808A is a true low-output impedance, 2-MHz operational amplifier. As such, the COMP pin can both source

and sink current. However, the error amplifier is internally current limited, so that zero duty cycle can be externally

forced by pulling COMP to GND.

The UCC3808A family features built-in full-cycle soft start. Soft start is implemented as a clamp on the maximum

COMP voltage.

CS: The input to the PWM, peak current, and overcurrent comparators. The overcurrent comparator is only intended

for fault sensing. Exceeding the overcurrent threshold will cause a soft start cycle. An internal MOSFET discharges

the current sense filter capacitor to improve dynamic performance of the power converter.

FB: The inverting input to the error amplifier. For best stability, keep FB lead length as short as possible and FB stray

capacitance as small as possible.

GND: Reference ground and power ground for all functions. Due to high currents, and high frequency operation of

the UCC3808A, a low impedance circuit board ground plane is highly recommended.

OUTA and OUTB: Alternating high current output stages. Both stages are capable of driving the gate of a power

MOSFET. Each stage is capable of 500-mA peak-source current, and 1-A peak-sink current.

The output stages switch at half the oscillator frequency, in a push-pull configuration. When the voltage on the RC

pin is rising, one of the two outputs is high, but during fall time, both outputs are off. This dead time between the two

outputs, along with a slower output rise time than fall time, insures that the two outputs can not be on at the same

time. This dead time is typically 60 ns to 200 ns and depends upon the values of the timing capacitor and resistor.

The high-current-output drivers consist of MOSFET output devices, which switch from VDD to GND. Each output

stage also provides a very low impedance to overshoot and undershoot. This means that in many cases,

external-schottky-clamp diodes are not required.

RC: The oscillator programming pin. The UCC3808A’s oscillator tracks VDD and GND internally, so that variations

in power supply rails minimally affect frequency stability. Figure 1 shows the oscillator block diagram.

Only two components are required to program the oscillator: a resistor (tied to the VDD and RC), and a capacitor (tied

to the RC and GND). The approximate oscillator frequency is determined by the simple formula:

1.41

RC

f

+

OSCILLATOR

where frequency is in Hz, resistance in Ohms, and capacitance in Farads. The recommended range of timing

resistors is between 10 kΩ and 200 kΩ and range of timing capacitors is between 100 pF and 1000 pF. Timing resistors

less than 10 kΩ should be avoided.

For best performance, keep the timing capacitor lead to GND as short as possible, the timing resistor lead from VDD

as short as possible, and the leads between timing components and RC as short as possible. Separate ground and

VDD traces to the external timing network are encouraged.

4

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ꢖ

SLUS456D – APRIL 1999 - REVISED AUGUST 2002

pin assignments (continued)

RC

4

1.41

FREQUENCY =

VDD

2

RC

(APPROXIMATE

FREQUENCY)

S

R

Q

OSCILLATOR

OUTPUT

0.2 V

UDG-00095

Figure 1. Block Diagram for Oscillator

NOTE A: The oscillator generates a sawtooth waveform on RC. During the RC rise time, the output stages alternate on time, but both stages are

off during the RC fall time. The output stages switch a 1/2 the oscillator frequency, with ensured duty cycle of < 50% for both outputs.

VDD: The power input connection for this device. Although quiescent VDD current is very low, total supply current

will be higher, depending on OUTA and OUTB current, and the programmed oscillator frequency. Total VDD current

is the sum of quiescent VDD current and the average OUT current. Knowing the operating frequency and the

MOSFET gate charge (Qg), average OUT current can be calculated from:

I

+ Q F, where F is frequency

g

OUT

To prevent noise problems, bypass VDD to GND with a ceramic capacitor as close to the chip as possible along with

an electrolytic capacitor. A 1-µF decoupling capacitor is recommended.

APPLICATION INFORMATION

A 200-kHz push-pull application circuit with a full-wave rectifier is shown in Figure 2. The output, V , provides 5 V

O

at 50 W maximum and is electrically isolated from the input. Since the UCC3808A is a peak-current-mode controller

the 2N2907 emitter following amplifier (buffers the CT waveform) provides slope compensation which is necessary

for duty ratios greater than 50%. Capacitor decoupling is very important with a single ground IC controller, and a 1

µF is suggested as close to the IC as possible. The controller supply is a series RC for start-up, paralleled with a bias

winding on the output inductor used in steady state operation.

Isolation is provided by an optocoupler with regulation done on the secondary side using the TL431 adjustable

precision shunt regulator. Small signal compensation with tight voltage regulation is achieved using this part on the

secondary side. Many choices exist for the output inductor depending on cost, volume, and mechanicall strength.

Several design options are iron powder, molypermalloy (MPP), or a ferrite core with an air gap as shown here. The

main power transformer has a Magnetics Inc. ER28 size core made of P material for efficient operation at this

frequency and temperature. The input voltage may range from 36 V dc to 72 V dc.

5

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ꢖ

SLUS456D – APRIL 1999 - REVISED AUGUST 2002

TYPICAL CHARACTERISTICS

IDD

OSCILLATOR FREQUENCY

vs

EXTERNAL RC VALUES

COMP TO CS OFFSET

vs

TEMPERATURE

vs

OSCILLATOR FREQUENCY

14

1000

1.2

1.0

C = 100 pF

12

VDD = 10 V, t = 25

C

IDD

with 1 nF load

C = 220 pF

10

C = 330 pF

100

0.8

8

6

0.6

0.4

C = 1000 pF

10

C = 820 pF

4

C = 560 pF

IDD

0.2

0

without load

2

0

1

–55 –35 –15

5

25

45

65

85 105 125

0

200

400

600

800

1000

1200

50

100

150

200

- °C

Temperature

Ω

RT – Timing Resistor – k

Oscillator Frequency – kHz

Figure 3

Figure 4

Figure 5

ERROR AMPLIFIER GAIN AND PHASE

OUTPUT DEAD TIME

vs

EXTERNAL RC VALUES

DEAD TIME

vs

TEMPERATURE

RESPONSE

vs

FREQUENCY

300

250

400

350

300

250

200

150

100

50

90

80

70

60

50

40

180

C = 1000 pF

160

140

120

100

80

VDD = 5 V

VDD = 7.5 V

C = 560 pF

C = 820 pF

C = 330 pF

200

150

Phase

VDD = 10 V

C = 220 pF

30

20

10

60

40

20

100

50

Gain

C = 100 pF

0

–100

–50

0

50

100

150

1

100

10000

1000000

50

100

150

200

250

Temperature - °C

RT – Timing Resistor – k Ω

Frequency – Hz

Figure 6

Figure 7

Figure 8

CS R

DS(on)

RC R

DS(on)

vs

TEMPERATURE

vs

TEMPERATURE

120

300

250

100

VDD = 5 V

80

60

40

200

150

100

VDD = 7.5 V

VDD = 10 V

20

0

50

0

–100

–50

0

50

100

150

–100

–50

0

50

100

150

Temperature - °C

Figure 9

Figure 10

7

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PACKAGE OPTION ADDENDUM

www.ti.com

9-Mar-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

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

Qty

Type

SOIC

PDIP

Drawing

HPA00001D

HPA00001DTR

UCC2808AD-1

UCC2808AD-2

UCC2808ADTR-1

UCC2808ADTR-2

UCC2808AN-1

ACTIVE

D

P

8

None

CU NIPDAU Level-1-220C-UNLIM

CU NIPDAU Level-NC-NC-NC

75

2500

50

Pb-Free

(RoHS)

UCC2808AN-2

ACTIVE

PDIP

P

8

50

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

UCC2808APW-1

UCC2808APW-2

UCC2808APWTR-1

UCC2808APWTR-2

UCC3808AD-1

ACTIVE

TSSOP

SOIC

PW

D

8

150

2000

75

None

CU NIPDAU Level-2-220C-1 YEAR

CU NIPDAU Level-1-220C-UNLIM

CU NIPDAU Level-NC-NC-NC

UCC3808AD-2

SOIC

D

75

UCC3808ADTR-1

UCC3808ADTR-2

UCC3808AN-1

SOIC

D

2500

50

SOIC

D

PDIP

P

Pb-Free

(RoHS)

UCC3808AN-2

ACTIVE

PDIP

P

8

50

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

UCC3808APW-1

UCC3808APW-2

ACTIVE

TSSOP

PW

8

150

None

CU NIPDAU Level-2-220C-1 YEAR

UCC3808APWTR-1

UCC3808APWTR-2

2000

⁽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.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional

product content details.

None: Not yet available Lead (Pb-Free).

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" and in addition, uses package materials that do not contain halogens,

including bromine (Br) or antimony (Sb) above 0.1% of total product weight.

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry 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

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

9-Mar-2005

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

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

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

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process

in which TI products or services are used. Information published by TI regarding third-party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

such altered documentation.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

www.ti.com/audio

Data Converters

dataconverter.ti.com

Automotive

www.ti.com/automotive

DSP

dsp.ti.com

Broadband

Digital Control

Military

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/military

Interface

Logic

interface.ti.com

logic.ti.com

Power Mgmt

Microcontrollers

power.ti.com

Optical Networking

Security

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

microcontroller.ti.com

Telephony

Video & Imaging

Wireless

www.ti.com/wireless

Mailing Address:

Texas Instruments

Post Office Box 655303 Dallas, Texas 75265


型号：	UCC3808A-1
厂家：	TEXAS INSTRUMENTS
描述：	LOW POWER CURRENT MODE PUSH-PULL PWM 低功耗电流模式推挽PWM
文件：	总10页 (文件大小：160K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UCC3808A-1 [TI]

相关型号：

UCC3808A-2

UCC3808AD-1

UCC3808AD-1G4

UCC3808AD-2

UCC3808AD-2G4

UCC3808ADTR-1

UCC3808ADTR-1G4

UCC3808ADTR-2

UCC3808AN-1

UCC3808AN-2

UCC3808AN-2G4

UCC3808APW-1