UCC380002D中文资料_数据手册_规格书

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

Low-Power BiCMOS Current-Mode PWM

FEATURES

DESCRIPTION

• 100µA Typical Starting Supply Current

The UCC1800/1/2/3/4/5 family of high-speed, low-power integrated cir-

cuits contain all of the control and drive components required for off-line

and DC-to-DC fixed frequency current-mode switching power supplies

with minimal parts count.

• 500µA Typical Operating Supply

Current

• Operation to 1MHz

• Internal Soft Start

These devices have the same pin configuration as the UC1842/3/4/5

family, and also offer the added features of internal full-cycle soft start

and internal leading-edge blanking of the current-sense input.

• Internal Fault Soft Start

The UCC1800/1/2/3/4/5 family offers a variety of package options, tem-

perature range options, choice of maximum duty cycle, and choice of crit-

ical voltage levels. Lower reference parts such as the UCC1803 and

UCC1805 fit best into battery operated systems, while the higher refer-

ence and the higher UVLO hysteresis of the UCC1802 and UCC1804

make these ideal choices for use in off-line power supplies.

• Internal Leading-Edge Blanking of the

Current Sense Signal

• 1 Amp Totem-Pole Output

• 70ns Typical Response from

Current-Sense to Gate Drive Output

o

The UCC180x series is specified for operation from –55 C to +125 C,

o

• 1.5% Tolerance Voltage Reference

the UCC280x series is specified for operation from –40 C to +85 C, and

o

the UCC380x series is specified for operation from 0 C to +70 C.

• Same Pinout as UC3842 and

UC3842A

Part Number

UCCx800

UCCx801

UCCx802

UCCx803

UCCx804

UCCx805

Maximum Duty Cycle

Reference Voltage

Turn-On Threshold

Turn-Off Threshold

100%

50%

5V

4V

5V

4V

7.2V

9.4V

6.9V

7.4V

8.3V

3.6V

8.3V

3.6V

100%

50%

12.5V

4.1V

12.5V

4.1V

50%

BLOCK DIAGRAM

UDG92009-3

03/99

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

CONNECTION DIAGRAMS

ABSOLUTE MAXIMUM RATINGS (Note 1)

V_CCVoltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0V

V_CCCurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.0mA

OUT Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1.0A

OUT Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . 20.0µJ

Analog Inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . –0.3V to 6.3V

Power Dissipation at T_A< +25°C (N or J Package) . . . . . 1.0W

Power Dissipation at T_A< +25°C (D Package). . . . . . . . 0.65W

Storage Temperature Range. . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 Seconds) . . . . . . . . +300°C

Note 1: All voltages are with respect to GND. All currents are

positive into the specified terminal. Consult Unitrode

databook for information regarding thermal specifica-

tions and limitations of packages.

TSSOP-8 (Top View)

PW Package

REF

8

COMP

1

2

3

4

FB

CS

VCC

7

6

5

OUT

GND

RC

Note 2: In normal operation V_CCis powered through a current

limiting resistor. Absolute maximum of 12V applies

when V_CCis driven from a low impedance source such

that I_CCdoes not exceed 30mA.

DIL-8, SOIC-8 (Top View)

J or N, D Package

TEMPERATURE AND PACKAGE SELECTION

Temperature Range

–55°C to +125°C

–40°C to +85°C

0°C to +70°C

Available Packages

COMP

FB

8

7

6

5

REF

1

2

3

4

UCC1800

UCC2800

UCC3800

J

N, D, PW

VCC

OUT

GND

CS

ORDERING INFORMATION

RC

UCC

80

PACKAGE

PRODUCT OPTION

TEMPERATURE RANGE

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ T_A≤ +125°C for

UCC180x; –40°C ≤ T_A≤ +85°C for UCC280x; 0°C ≤ T_A≤ +70°C for UCC380x; V_CC=10V (Note 3); RT=100k from REF to RC;

CT=330pF from RC to GND; 0.1µF capacitor from V_CCto GND; 0.1µF capacitor from V_REFto GND. T_A=T_J.

PARAMETER

TEST CONDITIONS

UCC180X

UCC280X

UCC380X

UNITS

MIN TYP MAX MIN TYP MAX

Reference Section

Output Voltage

T_J=+25°C, I=0.2mA, UCCx800/1/2/4

T_J=+25°C, I=0.2mA, UCCx803/5

0.2mA<I<5mA

4.925 5.00 5.075 4.925 5.00 5.075

3.94 4.00 4.06 3.94 4.00 4.06

V

Load Regulation

Total Variation

10

30

10

25

mV

V

UCCx800/1/2/4 (Note 7)

4.88 5.00 5.10 4.88 5.00 5.10

3.90 4.00 4.08 3.90 4.00 4.08

UCCx803/5 (Note 7)

V

Output Noise Voltage

Long Term Stability

Output Short Circuit

Oscillator Section

Oscillator Frequency

10Hz ≤ f ≤ 10kHz, T_J=+25°C (Note 9)

T_A=+125°C, 1000 Hours (Note 9)

130

5

130

5

µV

mV

mA

–5

–35

–5

–35

UCCx800/1/2/4 (Note 4)

UCCx803/5 (Note 4)

(Note 9)

40

26

46

31

52

36

40

26

46

31

52

36

kHz

%

Temperature Stability

Amplitude peak-to-peak

Oscillator Peak Voltage

2.5

2.25 2.40 2.55 2.25 2.40 2.55

2.45 2.45

V

2

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ T_A≤ +125°C for

UCC180x; –40°C ≤ T_A≤ +85°C for UCC280x; 0°C ≤ T_A≤ +70°C for UCC380x; V_CC=10V (Note 3); RT=100k from REF to RC;

CT=330pF from RC to GND; 0.1µF capacitor from V_CCto GND; 0.1µF capacitor from V_REFto GND. T_A=T_J.

PARAMETER

TEST CONDITIONS

UCC180X

UCC280X

UCC380X

UNITS

Error Amplifier Section

Input Voltage

COMP=2.5V; UCCx800/1/2/4

COMP=2.0V; UCCx803/5

2.44 2.50 2.56 2.44 2.50 2.56

V

1.95

–1

2.0

2.05 1.95

2.0

2.05

1

Input Bias Current

Open Loop Voltage Gain

COMP Sink Current

COMP Source Current

Gain Bandwidth Product

PWM Section

1

–1

60

µA

dB

60

80

FB=2.7V, COMP=1.1V

FB=1.8V, COMP=REF–1.2V

(Note 9)

0.3

3.5

0.4

2.5

mA

MHz

–0.2 –0.5 –0.8 –0.2 –0.5 –0.8

2

Maximum Duty Cycle

UCCx800/2/3

UCCx801/4/5

COMP=0V

97

48

99

49

100

50

0

97

48

99

49

100

50

0

%

Minimum Duty Cycle

Current Sense Section

Gain

(Note 5)

1.10 1.65 1.80 1.10 1.65 1.80

V/V

V

Maximum Input Signal

Input Bias Current

CS Blank Time

COMP=5V (Note 6)

0.9

–200

50

1.0

1.1

200 –200

150 50

0.9

1.0

1.1

200

150

nA

ns

V

100

Over-Current Threshold

COMP to CS Offset

Output Section

1.42 1.55 1.68 1.42 1.55 1.68

0.45 0.90 1.35 0.45 0.90 1.35

CS=0V

V

OUT Low Level

I=20mA, all parts

0.1

0.4

0.1

0.4

V

I=200mA, all parts

I=50mA, VCC=5V, UCCx803/5

I=20mA, VCC=0V, all parts

I=–20mA, all parts

I=–200mA, all parts

I=–50mA,VCC=5V, UCCx803/5

C_L=1nF

0.35 0.90

0.15 0.40

0.35 0.90

0.15 0.40

V

0.7

1.2

0.7

1.2

V

OUT High V_SAT

(V_CC-OUT)

0.15 0.40

V

1.0

0.4

41

1.9

0.9

70

1.0

0.4

41

1.9

0.9

70

V

Rise Time

ns

Fall Time

C_L=1nF

44

75

44

75

Undervoltage Lockout Section

Start Threshold (Note 8)

UCCx800

6.6

8.6

7.2

9.4

7.8

6.6

8.6

7.2

9.4

7.8

V

UCCx801

10.2

UCCx802/4

UCCx803/5

UCCx1800

UCCx1801

UCCx802/4

UCCx803/5

UCCx800

11.5 12.5 13.5 11.5 12.5 13.5

3.7

6.3

6.8

7.6

3.2

0.12

1.6

3.5

0.2

4.1

6.9

7.4

8.3

3.6

0.3

2

4.5

7.5

8.0

9.0

4.0

3.7

6.3

6.8

7.6

3.2

4.1

6.9

7.4

8.3

3.6

0.3

2

4.5

7.5

8.0

9.0

4.0

0.48

2.4

5.1

0.8

Stop Threshold (Note 8)

Start to Stop Hysteresis

0.48 0.12

UCCx801

2.4

5.1

0.8

1.6

3.5

0.2

UCCx802/4

UCCx803/5

4.2

0.5

4.2

0.5

3

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ T_A≤ +125°C for

UCC180x; –40°C ≤ T_A≤ +85°C for UCC280x; 0°C ≤ T_A≤ +70°C for UCC380x; V_CC=10V (Note 3); RT=100k from REF to RC;

CT=330pF from RC to GND; 0.1µF capacitor from V_CCto GND; 0.1µF capacitor from V_REFto GND. T_A=T_J.

PARAMETER

TEST CONDITIONS

UCC180X

UCC280X

UCC380X

UNITS

Soft Start Section

COMP Rise Time

FB=1.8V, Rise from 0.5V to REF–1V

4

10

4

10

ms

Overall Section

Start-up Current

V

_CC< Start Threshold

0.1

0.5

0.2

1.0

15

0.1

0.5

0.2

1.0

15

mA

V

Operating Supply Current

VCC Internal Zener Voltage

FB=0V, CS=0V

I_CC=10mA (Note 8)

12

13.5

1.0

12

13.5

1.0

VCC Internal Zener Voltage Minus UCCx802/4

Start Threshold Voltage

0.5

V

Note 3: Adjust VCC above the start threshold before setting at 10V.

Note 4: Oscillator frequency for the UCCx800, UCCx802 and UCCx803 is the output frequency.

Oscillator frequency for the UCCx801, UCCx804 and UCCx805 is twice the output frequency.

∆V_COMP

Note 5: Gain is defined by: A =

0 ≤V_CS≤ 0.8V.

∆V_CS

Note 6: Parameter measured at trip point of latch with Pin 2 at 0V.

Note 7: Total Variation includes temperature stability and load regulation.

Note 8: Start Threshold, Stop Threshold and Zener Shunt Thresholds track one another.

Note 9: Guaranteed by design. Not 100% tested in production.

PIN DESCRIPTIONS

effective CS to OUT propagation delay. Note, however,

that the minimum non-zero On-Time of the OUT signal is

directly affected by the leading-edge-blanking and the

CS to OUT propagation delay.

COMP: COMP is the output of the error amplifier and the

input of the PWM comparator.

Unlike other devices, the error amplifier in the UCC3800

family is a true, low output-impedance, 2MHz operational

amplifier. As such, the COMP terminal can both source

and sink current. However, the error amplifier is internally

current limited, so that you can command zero duty cycle

by externally forcing COMP to GND.

The over-current comparator is only intended for fault

sensing, and exceeding the over-current threshold will

cause a soft start cycle.

FB: FB is the inverting input of the error amplifier. For

The UCC3800 family features built-in full cycle Soft Start. best stability, keep FB lead length as short as possible

Soft Start is implemented as a clamp on the maximum and FB stray capacitance as small as possible.

COMP voltage.

GND: GND is reference ground and power ground for all

CS: CS is the input to the current sense comparators. functions on this part.

The UCC3800 family has two different current sense

OUT: OUT is the output of a high-current power driver

comparators: the PWM comparator and an over-current

capable of driving the gate of a power MOSFET with

comparator.

peak currents exceeding ± 750mA. OUT is actively held

The UCC3800 family contains digital current sense filter-

ing, which disconnects the CS terminal from the current

sense comparator during the 100ns interval immediately

following the rising edge of the OUT pin. This digital filter-

ing, also called leading-edge blanking, means that in

most applications, no analog filtering (RC filter) is re-

quired on CS. Compared to an external RC filter tech-

nique, the leading-edge blanking provides a smaller

low when V is below the UVLO threshold.

CC

The high-current power driver consists of FET output de-

vices, which can switch all of the way to GND and all of

the way to V . The output stage also provides a very

CC

low impedance to overshoot and undershoot. This means

that in many cases, external schottky clamp diodes are

not required.

4

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

PIN DESCRIPTIONS (cont.)

used as the logic power supply for high speed switching

logic on the IC.

RC: RC is the oscillator timing pin. For fixed frequency

operation, set timing capacitor charging current by con-

necting a resistor from REF to RC. Set frequency by con-

necting a timing capacitor from RC to GND. For best

performance, keep the timing capacitor lead to GND as

short and direct as possible. If possible, use separate

ground traces for the timing capacitor and all other func-

tions.

When V

is greater than 1V and less than the UVLO

CC

threshold, REF is pulled to ground through a 5k ohm re-

sistor. This means that REF can be used as a logic out-

put indicating power system status. It is important for

reference stability that REF is bypassed to GND with a

ceramic capacitor as close to the pin as possible. An

electrolytic capacitor may also be used in addition to the

ceramic capacitor. A minimum of 0.1µF ceramic is re-

quired. Additional REF bypassing is required for external

loads greater than 2.5mA on the reference.

The frequency of oscillation can be estimated with the

following equations:

1.5

UCCx800/1/2/4: F =

R • C

To prevent noise problems with high speed switching

transients, bypass REF to ground with a ceramic capaci-

tor very close to the IC package.

1.0

UCCx803, UCCx805: F =

R • C

where frequency is in Hz, resistance is in ohms, and ca-

pacitance is in farads. The recommended range of timing

resistors is between 10k and 200k and timing capacitor is

100pF to 1000pF. Never use a timing resistor less than

10k.

VCC: V

In normal operation V

limiting resistor. Although quiescent V current is very

low, total supply current will be higher, depending on

is the power input connection for this device.

CC

is powered through a current

CC

OUT current. Total V

current is the sum of quiescent

CC

V

current and the average OUT current. Knowing the

CC

To prevent noise problems, bypass VCC to GND with a

ceramic capacitor as close to the VCC pin as possible.

An electrolytic capacitor may also be used in addition to

the ceramic capacitor.

operating frequency and the MOSFET gate charge (Qg),

average OUT current can be calculated from:

I_OUT= Q_g× F .

REF: REF is the voltage reference for the error amplifier

and also for many other functions on the IC. REF is also

The UCC3800/1/2/3/4/5 oscillator generates a sawtooth

waveform on RC. The rise time is set by the time constant of

RT and CT. The fall time is set by CT and an internal transis-

tor on-resistance of approximately 125Ω. During the fall

time, the output is off and the maximum duty cycle is re-

duced below 50% or 100% depending on the part number.

Larger timing capacitors increase the discharge time and re-

duce the maximum duty cycle and frequency.

Figure 1. Oscillator.

Figure 2. Error amplifier gain/phase response.

5

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

4.00

3.98

3.96

3.94

3.92

3.90

3.88

3.86

3.84

3.82

1000

100

10

100

(k )

1000

4

4.2 4.4 4.6 4.8

5

5.2 5.4 5.6 5.8

6

R

T

V

CC (V)

Figure 3. UCC1803/5 V

vs. V ; I

= 0.5mA.

Figure 4. UCC1800/1/2/4 oscillator frequency vs. R

REF

CC LOAD

T

and C .

T

1000

100

99.5

99

98.5

98

100

97.5

97

96.5

96

95.5

95

10

100

(k )

1000

10

100

1000

R

T

Oscillator Frequency (kHz)

Figure 5. UCC1803/5 oscillator frequency vs. R and

Figure 6. UCC1800/2/3 maximum duty cycle vs.

oscillator frequency.

T

C

T.

50

49.5

49

16

14

12

, 1nF

10V

=

10

V^CC

48.5

48

8

6

47.5

47

, No Load

4

CC

V

= 10V

, No Load

8V

=

CC

V

2

0

46.5

0

100 200 300 400 500 600 700 800 900 1000

10

100

1000

Oscillator Frequency (kHz)

Figure 7. UCC1801/4/5 maximum duty cycle vs.

oscillator frequency.

Figure 8. UCC1800 ICC vs. oscillator frequency.

6

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

8

7

6

5

4

3

2

1

0

500

450

400

350

300

250

200

150

100

50

UCC1803/5

, 1nF

10V

=

V^CC

, 1nF

V^CC= 8V

UCC1800/1/2/4

, No Load

V^CC= 10V

, No Load

8V

=

CC

V

0

100

200

300

400

500

600

700

800

900 1000

0

100 200 300 400 500 600 700 800 900 1000

CT (pF)

Oscillator Frequency (kHz)

Figure 8. UCC1805 ICC vs. oscillator frequency.

Figure 9. Dead time vs. C , R = 100k.

T T

1.1

1.0

0.9

0.8

Slope = 1.8mV/°C

0.7

0.6

0

-55-50 -25

0

25

50

75

100

125

Temperature (°C)

Figure 10. COMP to CS offset vs. temperature,

CS = 0V.

7

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any product or service without notice, and advise customers to obtain the latest version of relevant information

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subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

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

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

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

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型号	制造商	描述	价格	文档
UCC380002DTR	ETC	Analog IC	获取价格
UCC380002J	ETC	Analog IC	获取价格
UCC380002N	ETC	Analog IC	获取价格
UCC380002PW	ETC	Analog IC	获取价格
UCC380002PWTR	ETC	Analog IC	获取价格
UCC380003D	ETC	Analog IC	获取价格
UCC380003DTR	ETC	Analog IC	获取价格
UCC380003J	ETC	Analog IC	获取价格
UCC380003N	ETC	Analog IC	获取价格
UCC380003PW	ETC	Analog IC	获取价格

UCC380002D

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