PTB48510 Datasheet, PDF (3/13 Pages) Texas Instruments – Dual Complementary-Output DC/DC Converter for DSL

PTB48510A, PTB48511A
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
Specifications (Unless otherwise stated, T_a =25°C, V_in =48 V, C_in =0 µF, ±C_o =0 µF, |+I_o | = |–I_o |, and |±I_o | =0.5 |±I_o |_max)
PTB4851xA
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Output Power
Output Current
Output Load Imbalance
Output Voltage
Temperature Variation
Line Regulation
Load Regulation
Efficiency
P_o
|±I_o |
|+I_o | – |–I_o |
|±V_o |
∆Reg_temp
∆Reg_line
∆Reg_load
η
Total output power from ±V_o
Over V_in range, |+I_o | – |–I_o | ≤ 0.1 A
|+I_o | ≥0.1 A, |–I_o | ≥ 0.1 A
Inlcudes set-point, line, |+I_o | – |–I_o | ≤ 0.1 A
–40 ≤T_a ≤+85°C
–40 ≤T_a ≤ +85°C, |±I_o | =0.1 A
+V_o
–V_o
Over V_in range, balanced load
±V_o
Over ±I_o range, balanced load
±V_o
0
—
0
—
0
—
4.75 ⁽²⁾
5
—
±1
—
±1
—
±0.1
—
±0.2
—
86
65 ⁽¹⁾
6.5 ⁽²⁾
1 ⁽³⁾
5.25 ⁽²⁾
—
—
±0.4
±0.4
—
W
A
A
V
%V_o
%V_o
%V_o
%
V_o Ripple (pk-pk)
Transient Response
Over Current Threshold
±V_r
t_tr
∆V_tr
I_otrip
20 MHz bandwidth,
C_o =10 µF tantalum capacitor
0.1 A/µs load step, 50% to 75% ±I_omax
|±V_o | over/undershoot
V_in =36 V
reset followed by auto-recovery
—
20
30 ⁽⁴⁾
mV_pp
—
30
—
µs
—
±1.0
—
%V_o
6.8
7.5
10
A
Over-Voltage Threshold
|±V_o | _trip
Outputs latched off ⁽⁵⁾
PTB48510
N/A
—
PTB48511
5.9
—
N/A
7
V
Short Circuit Current
Continuous over-current trip,
|+I_o | = |–I_o |
|±I_o |_pk
—
12.5
—
A
Duty
—
10
—
%
Output Voltage Adjust Range
Switching Frequency
Under-Voltage Lockout
On/Off Enable (pin 3)
Input High Voltage
Input Low Voltage
Input Low Current
|±V_o | _adj
ƒ_s
V_inon
V_inoff
V_IH
V_IL
I_IL
|+V_o | and |–V_o | adjust simulataneously
Over V_in and I_o ranges
V_in increasing
V_in decreasing
Referenced to –V_in (pin 4)
3.5
—
5.5
V
440
470 ⁽⁶⁾
500
kHz
—
33
—
V
—
32
—
+3.6
—
–0.2
—
—
—
+75 ⁽⁷⁾
V
+0.8
–1
mA
Standby Input Current
Start-up Time
Internal Input Capacitance
External Output Capacitance
Reliability
I_in standby
pin 3 open circuit
—
2
t_on
|±I_o | =1 A, |±V_o | rising 0 to 0.95 |±V_o | _typ
6
10
C_in
—
3
±C_o
Capacitance from either output to COM (pin 6)
0
—
MTBF
Per Bellcore TR-332
PTB48510A 2.7
—
50% stress, T_a =40°C, gnd benign PTB48511A
2.5
—
—
22
—
5,000 ⁽⁸⁾
—
—
mA
ms
µF
µF
10⁶ Hrs
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 +V_o is balanced to within ±0.1 A of that flowing into –V_o.
(3) A load imbalance is the difference in current flowing from +V_o to –V_o. 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 +V_o (pin 5) or –V_o (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 +V_in. 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.
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