UCC2813-4 datasheet, PDF - EEWORLD Datasheet

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UCC2813-4: DescriptionLow Power Economy BiCMOS Current Mode PWM; File Size179KB，8 Pages; ManufacturerETC

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UCC2813-4 Overview

Low Power Economy BiCMOS Current Mode PWM

UCC2813-4 Preview

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UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

Low Power Economy BiCMOS Current Mode PWM

FEATURES

•

100mA Typical Starting Supply Current

•

500mA Typical Operating Supply Current

•

Operation to 1MHz

•

Internal Soft Start

•

Internal Fault Soft Start

•

Internal Leading-Edge Blanking of the

Current Sense Signal

•

1 Amp Totem-Pole Output

•

70ns Typical Response from

Current-Sense to Gate Drive Output

•

1.5% Tolerance Voltage Reference

•

Same Pinout as UCC3802, UC3842, and

UC3842A

DESCRIPTION

The UCC3813-0/-1/-2/-3/-4/-5 family of high-speed, low-power inte-

grated circuits 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.

These devices have the same pin configuration as the UC3842/3/4/5

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

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

The UCC3813-0/-1/-2/-3/-4/-5 family offers a variety of package options,

temperature range options, choice of maximum duty cycle, and choice

of critical voltage levels. Lower reference parts such as the UCC3813-3

and UCC3813-5 fit best into battery operated systems, while the higher

reference and the higher UVLO hysteresis of the UCC3813-2 and

UCC3813-4 make these ideal choices for use in off-line power supplies.

The UCC2813-x series is specified for operation from –40°C to +85°C

and the UCC3813-x series is specified for operation from 0°C to +70°C.

ORDERING INFORMATION

Part Number

UCCx813-0

UCCx813-1

UCCx813-2

UCCx813-3

UCCx813-4

UCCx813-5

Maximum Duty Cycle

100%

50%

100%

50%

Reference Voltage

Turn-On Threshold

7.2V

9.4V

12.5V

4.1V

12.5V

4.1V

Turn-Off Threshold

6.9V

7.4V

8.3V

3.6V

8.3V

3.6V

BLOCK DIAGRAM

UDG-96134

SLUS161A - APRIL 1999 - REVISED JANUARY 2005

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

ABSOLUTE MAXIMUM RATINGS (Note 1)

VCC Voltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0V

VCC Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.0mA

OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±1.0A

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

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

Power Dissipation at T

< +25°C (N Package). . . . . . . . . 1.0W

Power Dissipation at T

< +25°C (D Package). . . . . . . . 0.65W

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

Junction Temperature . . . . . . . . . . . . . . . . . . . –55°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 Integrated

Circuits databook for information regarding thermal specifica-

tions and limitations of packages.

Note 2: In normal operation VCC is powered through a current

limiting resistor. Absolute maximum of 12V applies when VCC

is driven from a low impedance source such that ICC does not

exceed 30mA. The resistor should be sized so that the VCC

voltage under operating conditions is below 12V but above the

turn off threshold.

TEMPERATURE RANGE

–40°C TO +85°C

0°C TO +70°C

PACKAGES

N, D, PW

CONNECTION DIAGRAMS

DIL-8 or SOIC-8 (TOP VIEW)

N or D PACKAGE

COMP

REF

VCC

OUT

GND

TSSOP-8 (TOP VIEW)

PW PACKAGE

COMP

REF

VCC

OUT

GND

UCC2813

UCC3813

ORDERING INFORMATION

UCC

813

–

PRODUCT OPTION

PACKAGE

TEMPERATURE RANGE

UCC2813-x; 0°C

+70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;

0.1mF capacitor from VCC to GND; 0.1mF capacitor from VREF to GND. T

= T

PARAMETER

Reference Section

Output Voltage

Load Regulation

Total Variation

Output Noise Voltage

Long Term Stability

Output Short Circuit

Oscillator Section

Oscillator Frequency

Temperature Stability

Amplitude Peak-to-Peak

Oscillator Peak Voltage

UCCx813-0/-1/-2/-4 (Note 4)

UCCx813-5 (Note 4)

(Note 9)

2.25

2.5

2.40

2.45

2.55

kHz

= +25°C, I = 0.2mA, UCCx813-0/-1/-2/-4

= +25°C, I = 0.2mA, UCCx813-5

0.2mA < I < 5mA

UCCx813 -0-1/-2/-4 (Note 7)

UCCx813-5 (Note 7)

10Hz

10kHz, T

= +25°C (Note 9)

= +125°C, 1000 Hours (Note 9)

–5

4.84

3.84

4.925

3.94

5.00

4.00

5.00

4.00

–35

5.075

4.06

5.10

4.08

TEST CONDITIONS

MIN

UCC2813-x

UCC3813-x

TYP

MAX

UNITS

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these specifications apply for –40°C

+85°C for

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

UCC2813-x; 0°C

+70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;

0.1mF capacitor from VCC to GND; 0.1mF capacitor from VREF to GND. T

= T

PARAMETER

Error Amplifier Section

Input Voltage

Input Bias Current

Open Loop Voltage Gain

COMP Sink Current

COMP Source Current

Gain Bandwidth Product

PWM Section

Maximum Duty Cycle

Minimum Duty Cycle

Current Sense Section

Gain

Maximum Input Signal

Input Bias Current

CS Blank Time

Over-Current Threshold

COMP to CS Offset

Output Section

OUT Low Level

I = 20mA, all parts

I = 200mA, all parts

I = 50mA, VCC = 5V, UCCx813-3/-5

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

OUT High V

SAT

-OUT)

Rise Time

Fall Time

Undervoltage Lockout Section

Start Threshold (Note 8)

UCCx813-0

UCCx813-1

UCCx813-2/-4

UCCx813-3/-5

Stop Threshold (Note 8)

UCC1813-0

UCC1813-1

UCCx813-2/-4

UCCx813-3/-5

Start to Stop Hysteresis

UCCx813-0

UCCx813-1

UCCx813-2/-4

UCCx813-3/-5

6.6

8.6

11.5

3.7

6.3

6.8

7.6

3.2

0.12

1.6

3.5

0.2

7.2

9.4

12.5

4.1

6.9

7.4

8.3

3.6

0.3

4.2

0.5

7.8

10.2

13.5

4.5

7.5

8.0

9.0

4.0

0.48

2.4

5.1

0.8

I = –20mA, all parts

I = –200mA, all parts

I = –50mA,VCC = 5V, UCCx813-3/-5

= 1nF

0.1

0.35

0.15

0.7

0.15

1.0

0.4

0.90

0.40

1.2

0.40

1.9

0.9

CS = 0V

(Note 5)

COMP = 5V (Note 6)

1.10

0.9

1.65

1.0

100

1.55

0.90

1.80

1.1

200

150

1.70

1.35

V/V

UCCx813-0/-2/-3

UCCx813-1/-4/-5

COMP = 0V

100

FB = 2.7V, COMP = 1.1V

FB = 1.8V, COMP = REF – 1.2V

(Note 9)

COMP = 2.5V; UCCx813-0/-1/-2/-4

COMP = 2.0V; UCCx813-3/-5

2.42

1.92

2.50

2.0

2.5

–0.5

–0.8

2.56

2.05

MHz

TEST CONDITIONS

MIN

UCC2813-x

UCC3813-x

TYP

MAX

UNITS

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these specifications apply for –40°C

+85°C for

–

0.4

–0.2

–

200

1.32

0.45

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

UCC2813-x; 0°C

+70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;

0.1mF capacitor from VCC to GND; 0.1mF capacitor from VREF to GND. T

= T

PARAMETER

Soft Start Section

COMP Rise Time

Overall Section

Start-up Current

Operating Supply Current

VCC Internal Zener Voltage

VCC Internal Zener Voltage Minus Start

Threshold Voltage

VCC < Start Threshold

FB = 0V, CS = 0V, RC = 0V

ICC = 10mA (Note 8)

UCCx813-2/-4

0.5

0.1

0.5

13.5

1.0

0.23

1.2

FB = 1.8V, Rise from 0.5V to REF–1V

TEST CONDITIONS

MIN

UCC2813-x

UCC3813-x

TYP

MAX

UNITS

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these specifications apply for –40°C

+85°C for

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

Note 4: Oscillator frequency for the UCCx813-0, UCCx813-2 and UCCx813-3 is the output frequency.

Oscillator frequency for the UCCx813-1, UCCx813-4 and UCCx813-5 is twice the output frequency.

COMP

Note 5: Gain is defined by:

0.8

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: Ensured by design. Not 100% tested in production.

PIN DESCRIPTIONS

COMP:

COMP is the output of the error amplifier and the

input of the PWM comparator.

Unlike other devices, the error amplifier in the UCC3813

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 UCC3813 family features built-in full cycle Soft Start.

Soft Start is implemented as a clamp on the maximum

COMP voltage.

FB:

FB is the inverting input of the error amplifier. For

best stability, keep FB lead length as short as possible

and FB stray capacitance as small as possible.

CS:

CS is the input to the current sense comparators.

The UCC3813 family has two different current sense

comparators: the PWM comparator and an over-current

comparator.

The UCC3813 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

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.

The over-current comparator is only intended for fault

sensing, and exceeding the over-current threshold will

cause a soft start cycle.

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.

UCC2813-0/-1/-2/-3/-4/-5

UCC3813-0/-1/-2/-3/-4/-5

PIN DESCRIPTIONS (cont.)

The frequency of oscillation can be estimated with the

following equations:

UCCx813-0/-1/-2/-4:

1.5

1.0

low, total supply current will be higher, depending on

OUT current. Total VCC current is the sum of quiescent

VCC current and the average OUT current. Knowing the

operating frequency and the MOSFET gate charge (Qg),

average OUT current can be calculated from:

OUT

To prevent noise problems, bypass VCC to GND with a

0.1

ceramic capacitor in parallel as close to the VCC

pin as possible. An electrolytic capacitor may also be

used in addition to the ceramic capacitor.

REF:

REF is the voltage reference for the error amplifier

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

used as the logic power supply for high speed switching

logic on the IC.

When VCC is greater than 1V and less than the UVLO

threshold, REF is pulled to ground through a 5kW resis-

tor. This means that REF can be used as a logic output

indicating power system status. It is important for refer-

ence stability that REF is bypassed to GND with a ce-

ramic capacitor as close to the pin as possible. An

electrolytic capacitor may also be used in addition to the

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

quired. Additional REF bypassing is required for external

loads greater than 2.5mA on the reference.

To prevent noise problems with high speed switching

transients, bypass REF to ground with a ceramic capaci-

tor very close to the IC package.

UCCx813-3, UCCx813-5:

where frequency is in Hz, resistance is in

and capaci-

tance is in farads. The recommended range of timing re-

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

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

10k.

GND:

GND is reference ground and power ground for all

functions on this part.

OUT:

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

pable of driving the gate of a power MOSFET with peak

currents exceeding

±750mA.

OUT is actively held low

when VCC is below the UVLO threshold.

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 VCC. The output stage also provides a very

low impedance to overshoot and undershoot. This

means that in many cases, external schottky clamp di-

odes are not required.

VCC:

VCC is the power input connection for this device.

In normal operation VCC is powered through a current

limiting resistor. Although quiescent VCC current is very

APPLICATION INFORMATION

UDG-96139

The UCC3813-0/-1/-2/-3/-4/-5 oscillator generates a sawtooth waveform on RC. The rise time is set by the time constant of R

and C

. The fall time is set by CT and an internal transistor on-resistance of approximately 125W. During the fall time, the out-

put is off and the maximum duty cycle is reduced below 50% or 100% depending on the part number. Larger timing capacitors

increase the discharge time and reduce the maximum duty cycle and frequency.

Figure 1. Oscillator.

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