PT6881_技术文档

PT6880 Series

5-A, 15-36-V Input

Integrated Switching Regulator

SLTS103B -JULY 2000 - REVISED JANUARY 2003

Features

• 5A Non-Isolated Output

• >90% Efficiency

• Low-cost Alternative to Isolated

Converters

• Standby Function

• Solderable Copper Case

• Surface Mountable

• IPC Lead Free 2

• 15 to 36V Input Voltage Range

• Adjustable Output Voltage

• Output Remote Sense

Description

Pin-Out Information

Ordering Information

The PT6880 product family is a series

of highly efficient, non-isolated integrated

switching regulator (ISR) modules. De-

signed to operate off a wide-input bus,

these regulators produce a tightly reg-

ulated output voltage at load currents of

up to 5A. The series includes standard

output voltage options ranging from

2.5V to 15V.

The series is an ideal choice for general

purpose and industrial applications that

operate off a 24/28V battery providing a

low-cost alternative to a fully isolated

converter.

Pin Function

PT6881r

PT6882r

PT6883r

PT6884r

=

3.3 Volts

2.5 Volts

5.0 Volts

9.0 Volts

1

2

3

4

5

6

7

8

9

Vo Adjust

No Connect

STBY *

No Connect

GND

Vin

PT6885r = 15.0 Volts

PT6886r = 12.0 Volts

PT Series Suffix

(PT1234x)

10 Vin

11 GND

12 GND

13 GND

14 GND

15 Vout

16 Vout

17 Vout

18 Remote Sense

Case/Pin

Configuration

Order

Suffix

Package

Code *

Vertical

Horizontal

SMD

N

A

C

(EPD)

(EPA)

(EPC)

The PT6880 series is packaged in a

thermally efficient, 18-pin, space-saving

copper case. Both vertical and horizontal

configurations are available, including

surface-mount.

* Previously known as package styles 1500/10.

(Reference the applicable package code drawing

for the dimensions and PC board layout).

*

For further information, see

application notes.

Standard Application

REMOTE SENSE

18

V_IN

V_OUT

15,16,17

8, 9,10

PT6880

6, 7,

11–14

+

L

O

A

D

C_IN

C_OUT

COM

C_in= Required 560µF electrolytic

C_out= Required 330µF electrolytic

For technical support and more information, see inside back cover or visit www.ti.com

PT6880 Series

5-A, 15-36-V Input

Integrated Switching Regulator

SLTS103B -JULY 2000 - REVISED JANUARY 2003

Specifications (Unless otherwise stated, T_a=25°C, V_in=28V, C_in=560µF, C_out=330µF, and I_o=I_omax)

PT6880 SERIES

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

(1)

Output Current

I_o

T_a=60°C, 200LFM

V_o≤ 12V

0.1

—

5

4

A

V_o> 12V

(2)

Input Voltage Range

V_in

Over I_orange

V_o=2.5V

V_o=3.3V

V_o=5.0V

V_o≥6.5V

15

18

—

25

33

36

Vdc

Set Point Voltage Tolerance

Temperature Variation

Line Regulation

Load Regulation

Total Output Voltage Variation

V_otol

—

0.5

1

—

1

%V_o

Reg_temp

Reg_line

Reg_load

∆V_otot

–40° ≤T_a≤ +85°C, I_o=I_omin

Over V_inrange

Over I_orange

Includes set-point, line, load,

–40° ≤T_a≤ +85°C

1

—

1.5

2

%V_o

Efficiency

η

V_o= 15V

V_o= 12V

V_o=9.0V

V_o=5.0V

V_o=3.3V

V_o=2.5V

—

90

88

87

82

73

78

—

%

V_oRipple (pk-pk)

Transient Response

Switching Frequency

V_r

20MHz bandwidth

V_o≤5V

V_o>5V

—

500

50

1

100

550

—

600

mV_pp

%V_o

µs

mV

kHz

t_tr

∆V_tr

ƒ_s

5A/µs load step, 50% to 100% I_omax

V_oover/undershoot

Over V_inand I_orange

On/Off Standby (Pin 4)

Input High Voltage

Input Low Voltage

Input Low Current

Referenced to GND (pin 6)

(3)

V_IH

V_IL

I_IL

2.0

—

–0.5

16

—

Open

+0.4

–

35

—

V

–0.1

—

mA

µF

Standby Input Current

External Input Capacitance

External Output Capacitance

Operating Temperature Range

Solder Reflow Temperature

Storage Temperature

I_instandby

C_in

C_out

pins 4 & 6 connected

See application schematic

Over V_inrange

Surface temperature of module pins or case

—

(4)

560

330

–40

—

1,000

µF

(5)

T

85

°C

a

(6)

T_reflow

T

s

215

125

–40

Reliability

MTBF

Per Bellcore TR-332

6

7.7

—

10 Hrs

50% stress, T_a=40°C, ground benign

Mechanical Shock

—

Per Mil-Std-883D, method 2002.3,

1ms, half-sine, mounted to a fixture

500

G’s

(7)

Mechanical Vibration

—

Mil-Std-883D, Method 2007.2,

20-2000Hz, soldered in PCB

Suffix N, A

Suffix C

—

20

—

G’s

15

Weight

Flammability

—

23

—

grams

Materials meet UL 94V-0

Notes: (1) The ISR will operate at no load with reduced specifications.

(2) The stated maximum input voltage assumes the nominal output voltage. If the output voltage is adjusted (trimmed) to some other value, consult the

related application note on output voltage adjustment for the revised input voltage limitations.

(3) The STBY* control (pin 4) has an internal pull-up and if it is left open circuit the module will operate when input power is applied. The open-circuit

voltage is low (less than 5V). Consult the related application note for interface considerations.

(4) For guidance on suitable input and output capacitors consult the accompanying application note, “Capacitor Recommendations for the PT6880 Series.”

(5) See Safe Operating Area curves or contact the factory for the appropriate derating.

(6) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For

further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).

(7) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information consult the applicable package outline drawing.

For technical support and more information, see inside back cover or visit www.ti.com

Typical Characteristics

PT6880Series

5-A, 15-36-V Input

Integrated Switching Regulator

SLTS103B -JULY 2000 - REVISED JANUARY 2003

PT6883 V_out=5V (Note A)

PT6886, V_out=12V (Note A)

PT6881, V_out=3.3V (Note A)

Efficiency vs Output Current

90

80

70

60

50

90

80

70

60

50

100

90

80

70

60

50

V_IN

18.0V

24.0V

36.0V

18.0V

24.0V

36.0V

18.0V

24.0V

36.0V

0

0.8

1.6

2.4

3.2

4

0

1

2

3

4

5

0

1

2

3

4

5

Iout - (A)

Iout (A)

Ripple vs Output Current

50

40

30

20

10

0

50

40

30

20

10

0

100

80

60

40

20

0

V_IN

18.0V

24.0V

36.0V

18.0V

24.0V

36.0V

24.0V

18.0V

0

0.8

1.6

2.4

3.2

4

0

1

2

3

4

5

0

1

2

3

4

5

Iout - (A)

Iout (A)

Power Dissipation vs Output Current

6

5

4

3

2

1

0

6

5

4

3

2

1

0

6

5

4

3

2

1

0

V_IN

36.0V

24.0V

18.0V

36.0V

24.0V

18.0V

36.0V

24.0V

18.0V

0

1

2

3

4

5

0

0.8

1.6

2.4

3.2

4

0

1

2

3

4

5

Iout - (A)

Iout (A)

SOA Curves @V_in=+24V (Note B)

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

Airflow

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

Nat Conv

0

1

2

3

4

5

0

1

2

3

4

5

0

0.8

1.6

2.4

3.2

4

Iout (A)

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.

Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6880 Series

Capacitor Recommendations for the

PT6880 Regulator Series

Tantalum Capacitors (For V_out<5.1V)

Input Capacitor:

Tantalum type capacitors can be used on the output bus

for output voltages less than 5.1V. Voltages higher than this

will exceed the capacitor’s published surge voltage limits.

The required input capacitor is determined by a 1.2Arms

minimum ripple current rating and 560µF capacitance

value. The ripple current rating and <120mΩ equivalent

series resistance (ESR) are the major considerations, along

with temperature, when designing with different types of

capacitors.

If tantalum capacitors are located on the output bus, an

2

appropriate fuse with I t current derating is recommended

along with an external clamp component. An Output

Over-voltage Clamp (OOVC) will fault the output fuse

protecting the capacitors in event of an over-voltage condi-

tion. The OOVC can be a simple zener high power di-

ode, 3-5W, located on the load side of the output bus. The

zener diode should be rated to 1.3 times the normal out-

put voltage.

Tantalum/Os-Con® capacitors are not recommended

due to a minimum voltage rating of 2× (the maximum

DC voltage + AC ripple). This is necessary to improve

the reliability of these capacitors in high bus applications.

Output Capacitors:

The ESR specification of the output capacitor should be

at least 50mΩ. Electrolytic capacitors have marginal

ripple performance at frequencies greater than 400kHz

but excellent low frequency transient response. Above

the ripple frequency ceramic capacitors are necessary

to improve the transient response and reduce any high-

frequency noise components apparent during higher

current excursions. Electrolytic capacitors with appropriate

ESR values are identified in Table 1-1. In low-temperature

applications (<0°C), a higher capacitance with lower ESR

will improve performance.

Capacitor Table

Table 1-1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple

current (rms) ratings. The number of capacitors required

at both the input and output buses is identified for each

capacitor type.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those listed

are for guidance. The RMS ripple current rating and ESR

(Equivalent Series Resistance at 100kHz) are critical parameters

necessary to insure both optimum regulator performance and

long capacitor life.

Os-Con® and ultra low ESR type capacitors are not recom-

mended on the output bus as they degrade regulator stability.

Table 1-1: Input/Output Capacitors

Capacitor Vendor/

Series

Capacitor Characteristics

Quantity

Working

Voltage

Value(µF)

(ESR) Equivalent

Series Resistance

105°C Maximum

Ripple

Physical

Size(mm)

Input

Bus

Output

Bus

Vendor Part Number

Current(Irms)

Panasonic

FC (Radial)

50V

560

390

0.068Ω

0.080Ω

1900mA

1610mA

18×15

16x15

16×15

1

2

1

EEUFC1H561

EEUFC1H391S

FC/FK (Surface Mtg)

63V

35V

50V

680

330

1000

0080Ω

0.080Ω

0.073Ω

1690mA

850mA

1610mA

18×16.5

10×10.2

16×16.5

1

N/R ⁽¹⁾

1

EEVFK1J681M

EEVFK1V331P

EEVFK1H102M

United Chemi-con

LXZ/LXV Series

50V

35V

680

330

0.048Ω

0.068Ω

1840mA

1050mA

16×20

10×16

1

LXZ50VB681M16X20LL

LXV35VB331M10X16LL

N/R ⁽¹⁾

MVY (Surface Mtg)

35V

220

0.150Ω

670mA

10×10.3

N/R ⁽¹⁾

2

MVY35VC2211M10X10TP

Nichicon

PM Series

50V

63V

50V

560

330

0.044Ω

0.039Ω

0.060Ω

1550mA

1400mA

1210mA

16×20

18×20

16×15

1

2

1

UPM1H561MHH6

UPM1J561MHH6

UPM1H331MHH6

AVX Tantalum

TPS (Surface Mtgt)

10V

330

0.10Ω

0.06Ω

>2500mA

>3000mA

7.3L

×5.7W

×4.1H

N/R ⁽¹⁾

1

TPSE337M010R0100 (V_o<5.1V)

TPSV337M010R0060 (V_o<5.1V)

Kemet Tantalum ⁽²⁾

T496 /T495 Series

(Surface Mount)

10V

220

0.500Ω

0.070Ω

500mA

>2000mA

4.3W

×7.3L

×4.0H

N/R ⁽¹⁾

2

T496X227M010AS (V_o<5.1V)

T495X227M0100AS (V_o<5.1V)

Sprague Tantalum ⁽²⁾

594D Series

(Surface Mount)

10V

330

0.130Ω

1393mA

7.2L

×6W

×4.1H

N/R ⁽¹⁾

1

595D337X0010R2T (V_o<5.1V)

Notes: (1) N/R –Not recommended. The voltage rating does not meet the minimum operating limits.

(2) A fused input bus is recommended when tantalum capacitors are used on the output bus.

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6880 Series

Using the On/Off Standby Function on the

PT6880 Excalibur™ Series of ISRs

The PT6880 series of integrated switching regulators

(ISRs) incorporate an on/off standby function, which

may be used to disable the regulator output. This func-

tion is provided by the STBY* control (pin 4). If pin 4 is left

open-circuit the regulator operates normally, providing a

regulated output whenever a valid supply voltage is applied

to V_in(pins 8–10) with respect to GND (pins 6, 7, & 11–

14). If the STBY* control is driven low to ground ¹, the

regulator output is disabled and the input current drawn

by the ISR drops to its idle value ².

Turn-On Time: In the circuit of Figure 2-1, turning Q₁on

applies a low voltage to pin 4 and disables the regulator

output. Correspondingly, turning Q₁off removes the

low-voltage signal and enables the output. Once enabled

the output will typically experience a 5–10ms delay fol-

lowed by a quick ramp-up of voltage. The regulator should

provide a fully regulated output within 20ms. The wave-

forms of Figure 1-2 show the rise of both the output

voltage and input current for a PT6883 (5V). The turn

off of Q₁corresponds to the drop of Q₁Vgs. The wave-

form was measured with a 24Vdc input voltage and 4-ADC

load.

The STBY* pin must be controlled with a low-leakage

open-collector (or open-drain) discrete transistor ^3.See

Figure 2-1 for the application schematic, and Table 2-1

for the input parameters.

Figure 2-2

Table 2-1 Standby Control Requirements

Parameter

Min

Typ

Max

Enable (V_IH

Disable (V_IL

)

—

–0.2V

Open Circuit

0.3V

I_stby(pin 4 =ground)

V_stby(open circuit)

–50µA

1.4V

Vo (2V/Div)

2V

Iin (1A/Div)

Figure 2-1

REMOTE SENSE

Q1Vgs (10V/Div)

18

Rem Sense

V_IN

V_OUT

15,16,17

8, 9,10

V_IN

V_O

PT6880

HORIZ SCALE: 5ms/Div

STBY*

4

GND

6, 7,

11–14

+

L

O

A

D

C_IN

C _{O U T}

Notes:

Q₁

BSS138

1. To ensure that the regulator output is disabled, the

control pin must be pulled to less than 0.3Vdc with a

low-level 0.1mA sink to ground.

1 =Inhibit

COM

2. When the regulator output is disabled the current drawn

from the V_ininput source is typically reduced to less than

20mA.

3. The standby control input is NOT compatible with TTL

devices that incorporate a totem-pole output drive. Use

only a true open-collector device, preferably a low-leakage

discrete bipolar transistor (or MOSFET). Do Not use a

pull-up resistor, or drive the STBY* pin with an external

voltage.

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6880 Series

Adjusting the Output Voltage of the PT6880

5-A Excalibur™ Converter Series

Figure 3-1

The output voltage of the Power Trends PT6880 Excalibur

series of ISRs may be adjusted higher or lower than the

factory trimmed pre-set voltage with the addition of a

18

1

single external resistor . Table 3-1 gives the respective

Vsense

allowable adjustment range for each model in the series as

V_a(min) and V_a(max).

8

–10

15 –17

Vin

Vo

Vin

PT6880

Vo

STBY

4

GND

6, 7,

Vo(adj)

1

Adjust Up: An increase in the output voltage is obtained

by adding a resistor R₂, between pin 1 (V_oAdjust) and

pins 6, 7 /11-14 (GND).

11

– 14

(R1)

Adj Down

L

O

A

D

+

C _in

C_out

Adjust Down: Add a resistor (R₁), between pin 1 (V_oAd-

just) and pins 15-17 (V_out).

R2

Adjust

Up

Refer to Figure 3-1 and Table 3-2 for both the placement and

value of the required resistor, either (R₁) or R₂as appropriate.

C O M

Notes:

1. Use only a single 1% resistor in either the (R₁) or R₂

location. Place the resistor as close to the ISR as possible.

The values of (R₁) [adjust down], and R₂[adjust up], can

also be calculated using the following formulas.

2. Never connect capacitors from V_oadjust to either GND,

V_out, or the Remote Sense pin. Any capacitance added to

the V_oadjust pin will affect the stability of the ISR.

R_o(V_o– 1.25) (V_a– 1.25)

(R₁)

R₂

=

– R_skΩ

kΩ

1.25 (V_o– V_a)

3. If the remote sense feature is being used, connecting the

resistor (R₁) between pin 1 (V_oAdjust) and pin 18 (Remote

Sense) can benefit load regulation.

R_o(V_o– 1.25)

V_a- V_o

– R_s

4. For output voltages above 10Vdc, the maximum output

current must be limited to 4Adc.

5. Adjustments to the output voltage may place additional

limits on the input voltage for the part. The revised limits

must comply with the following requirements.

Where: V_o= Original output voltage

V_a= Adjusted output voltage

R_o= The resistance value in Table 3-1

R_s= The series resistance from Table 3-1

V_in(min)

= (V_out+ 3)V or 15V,

whichever is higher.

V_in(max)

= (10 x V_out)V or 36V,

whichever is less.

Table 3-1

PT6880 ADJUSTMENT AND FORMULA PARAMETERS

Series Pt #

PT6882

PT6881

PT6883

PT6884

PT6886

PT6885

V_o(nom)

V_a(min)

V_a(max)

R_o(kΩ)

R_s(kΩ)

2.5V

1.8V

4.3V

4.99

2.49

3.3V

2.2V

4.7V

4.22

4.99

5.0V

3.0V

6.5V

2.49

4.99

9.0V

6.0V

10.2V

2.0

12.0V

9.0V

13.6V

2.0

15.0V

10.0V

17.0V

2.0

12.7

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes continued

PT6880 Series

Table 3-2

PT6880 ADJUSTMENT RESISTOR VALUES

Series Pt #

Current

PT6882

5Adc

PT6881

5Adc

PT6883

5Adc

Series Pt #

Current

PT6884

5Adc

PT6886

4Adc

PT6885

4Adc

V_o(nom)

V_a(req’d)

2.5Vdc

3.3Vdc

5Vdc

V_o(nom)

V_a(req’d)

9Vdc

12Vdc

15Vdc

1.8

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

3.1

3.2

3.3

3.4

3.5

3.6

3.7

3.8

3.9

4.0

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

5.0

5.1

5.2

5.3

5.4

5.5

5.6

5.7

5.8

5.9

6.0

6.1

6.2

6.3

6.4

6.5

R₁= (Blue)

(1.4)kΩ

(2.9)kΩ

(5.0)kΩ

(8.1)kΩ

(13.3)kΩ

(23.7)kΩ

(54.9)kΩ

6.0

6.2

6.4

6.6

6.8

7.0

7.2

7.4

7.6

7.8

8.0

8.2

8.4

8.6

8.8

9.0

9.2

(6.9)kΩ

(9.2)kΩ

(11.9)kΩ

(14.0)kΩ

(18.6)kΩ

(23.0)kΩ

(28.3)kΩ

(35.0)kΩ

(43.5)kΩ

(55.0)kΩ

(71.0)kΩ

(95.0)kΩ

(135.0)kΩ

(215.0)kΩ

(455.0)kΩ

(1.0)kΩ

(2.3)kΩ

(3.9)kΩ

(5.8)kΩ

(8.4)kΩ

(11.7)kΩ

(16.5)kΩ

(23.6)kΩ

(35.4)kΩ

(59.0)kΩ

(130.0)kΩ

59.9kΩ

28.7kΩ

18.3kΩ

13.1kΩ

10.0kΩ

7.9kΩ

6.4kΩ

5.3kΩ

4.4kΩ

3.8kΩ

3.2kΩ

2.7kΩ

2.3kΩ

2.0kΩ

1.7kΩ

1.4kΩ

1.2kΩ

1.0kΩ

(1.6)kΩ

(2.3)kΩ

(3.1)kΩ

(4.0)kΩ

(5.1)kΩ

(6.2)kΩ

(7.6)kΩ

(9.1)kΩ

(10.9)kΩ

(13.0)kΩ

(15.6)kΩ

(18.7)kΩ

(22.6)kΩ

(27.6)kΩ

(34.2)kΩ

(43.6)kΩ

(57.6)kΩ

(80.9)kΩ

(128.0)kΩ

(268.0)kΩ

(31.7)kΩ

(36.1)kΩ

(41.2)kΩ

(47.1)kΩ

(54.1)kΩ

(62.6)kΩ

(72.8)kΩ

(85.7)kΩ

(102.0)kΩ

(124.0)kΩ

(155.0)kΩ

(201.0)kΩ

(278.0)kΩ

(432.0)kΩ

(895.0)kΩ

81.5kΩ

38.3kΩ

23.8kΩ

16.6kΩ

12.3kΩ

9.4kΩ

7.4kΩ

5.8kΩ

4.6kΩ

3.7kΩ

2.9kΩ

2.2kΩ

1.7kΩ

1.2kΩ

64.8kΩ

26.1kΩ

13.1kΩ

6.7kΩ

2.8kΩ

9.4

9.6

9.8

10.0

10.2

10.4

10.6

10.8

11.0

11.2

11.4

11.6

11.8

12.0

12.2

12.4

12.6

12.8

13.0

13.2

13.4

13.6

13.8

14.0

14.2

14.5

15.0

15.5

16.0

16.5

17.0

(25.8)kΩ

(28.3)kΩ

(31.1)kΩ

(34.1)kΩ

(37.3)kΩ

(40.9)kΩ

(44.9)kΩ

(49.3)kΩ

(54.3)kΩ

(59.8)kΩ

(66.1)kΩ

(73.3)kΩ

(81.6)kΩ

(91.3)kΩ

(103.0)kΩ

(117.0)kΩ

(133.0)kΩ

(154.0)kΩ

(181.0)kΩ

(217.0)kΩ

(268.0)kΩ

(343.0)kΩ

(570.0)kΩ

0.2kΩ

94.8kΩ

41.1kΩ

23.1kΩ

14.2kΩ

8.8kΩ

5.2kΩ

2.7kΩ

0.7kΩ

88.4kΩ

41.7kΩ

26.1kΩ

18.4kΩ

13.7kΩ

10.6kΩ

8.4kΩ

6.7kΩ

5.4kΩ

4.4kΩ

3.5kΩ

2.8kΩ

2.2kΩ

1.7kΩ

1.2kΩ

42.3kΩ

14.8kΩ

5.6kΩ

1.1kΩ

R₂= Black

For technical support and more information, see inside back cover or visit www.ti.com

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型号：	PT6881
厂家：	TEXAS INSTRUMENTS
描述：	5-A, 15-36-V Input Integrated Switching Regulator 5 -A ， 15-36 - V输入集成开关稳压器稳压器开关
文件：	总8页 (文件大小：189K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PT6881 [TI]

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