PTB48511B datasheet(3/13 Pages) TI

Part #	PTB48511B

Description	Dual Complementary-Output DC/DC Converter for DSL

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PTB48510A, PTB48511A

Dual Complementary-Output

DC/DC Converter for DSL

Specifications (Unless otherwise stated, Ta =25°C, Vin =48 V, Cin =0 µF, ±Co =0 µF, |+Io | = |–Io |, and |±Io | =0.5 |±Io |max)

PTB4851xA

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

Output Power

Po

Total output power from ±Vo

0—

65 (1)

W

Output Current

|±Io |

Over Vin range, |+Io | – |–Io | ≤ 0.1 A

0

—

6.5 (2)

A

Output Load Imbalance

|+Io | – |–Io ||+Io | ≥0.1 A, |–Io | ≥ 0.1 A

0

—

1

(3)

A

Output Voltage

|±Vo|

Inlcudes set-point, line,

|+Io | – |–Io | ≤ 0.1 A

4.75 (2)

5

5.25 (2)

V

–40

≤Ta ≤+85°C

Temperature Variation

∆Regtemp

–40

≤Ta≤ +85°C, |±Io | =0.1 A

+Vo

—±1

—

%Vo

–Vo

—±1

—

Line Regulation

∆Regline

Over Vin range, balanced load

±Vo

—

±0.1

±0.4

%Vo

Load Regulation

∆Regload

Over ±Io range, balanced load

±Vo

—

±0.2

±0.4

%Vo

Efficiency

η

—86

—

%

Vo Ripple (pk-pk)

±Vr

20 MHz bandwidth,

—

20

30 (4)

mVpp

Co =10 µF tantalum capacitor

Transient Response

ttr

0.1 A/µs load step, 50% to 75% ±Iomax

—

30

—

µs

∆Vtr

|±Vo|over/undershoot

—

±1.0

—

%Vo

Over Current Threshold

Iotrip

Vin =36 V

6.8

7.5

10

A

reset followed by auto-recovery

Over-Voltage Threshold

|±Vo| trip

Outputs latched off (5)

PTB48510

N/A

—

N/A

V

PTB48511

5.9

—

7

Short Circuit Current

Continuous over-current trip,

|±Io |pk

—

12.5

—

A

|+Io | = |–Io |

Duty

—

10

—

%

Output Voltage Adjust Range

|±Vo|adj

|+Vo | and |–Vo | adjust simulataneously

3.5

—

5.5

V

Switching Frequency

ƒs

Over Vin and Io ranges

440

470 (6)

500

kHz

Under-Voltage Lockout

Vinon

Vin increasing

—

33

—

V

Vinoff

Vin decreasing

—

32

—

On/Off Enable (pin 3)

Referenced to –Vin (pin 4)

Input High Voltage

VIH

+3.6

—

+75 (7)

V

Input Low Voltage

VIL

–0.2

—

+0.8

Input Low Current

IIL

——–1

mA

Standby Input Current

Iin standby

pin 3 open circuit

—

2

—

mA

Start-up Time

ton

|±Io | =1 A, |±Vo | rising 0 to 0.95 |±Vo | typ

6

1022ms

Internal Input Capacitance

Cin

—3

—µF

External Output Capacitance

±Co

Capacitance from either output to COM (pin 6)

0

—

5,000 (8)

µF

Reliability

MTBF

Per Bellcore TR-332

PTB48510A

2.7

—

106 Hrs

50% stress, Ta =40°C, gnd benign PTB48511A

2.5

—

Notes:

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

(2) Under balanced load conditions, load current flowing out of +Vo is balanced to within ±0.1 A of that flowing into –Vo.

(3) A load imbalance is the difference in current flowing from +Vo to –Vo. The module can operate with a higher imbalance but with reduced specifications.

(4) Output voltage ripple is measured with a 10 µF tantalum capacitor connected from +Vo (pin 5) or –Vo (pin 8), to COM (pin 6).

(5) If the over-voltage threshold is exceeded by either regulated output the module will shut down, turning both outputs off. This is a latched condition, which

can only by reset by removing and then re-applying the module’s input power.

(6) This is the free-running frequency. The module can be made to synchronize with the PTB48500 when both modules are used together in a system.

(7) The On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor. The input is diode protected

and may be connected to +Vin. The open-circuit voltage is 5 V max. If it is left open circuit the converter will operate when input power is applied.

(8) Electrolytic capacitors with very low equivalent series resistance (ESR) may induce instability when used on the output. Consult the factory before using

capacitors with organic, or polymer-aluminum type electrolytes.

SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004

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