PTB48510_14 Datasheet, PDF (5/18 Pages) Texas Instruments – DUAL COMPLEMENTARY-OUTPUT DC/DC CONVERTER FOR DSL

www.ti.com
Not Recommended for New Designs
PTB48510
PTB48511
SLTS219F – FEBRUARY 2004 – REVISED MARCH 2007
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, T_A = 25°C, V_I = 48 V, C_I = 0 μF, C_O = 0 μF, I_O1 = I_O2 = 3.25 A maximum)
PARAMETER
TEST CONDITIONS
PTB4851xC
MIN
TYP MAX
P_O
I_O1 or I_O2
I_O1 - I_O2
Output Power
Output Current
Output Load Imbalance
Total output power from V_O1 or V_O2
Over V_I range, I_O1 ≤ 0.1 A or I_O2 ≤ 0.1 A
I_O1 ≤ 0.1 A or I_O2 ≤ 0.1 A
0
66 ⁽¹⁾
0
2.2 ⁽²⁾
0
1 ⁽³⁾
V_O1 or V_O2 Output Voltage
Includes set point, line, load, I_O1 - I_O2 ≤ 0.1 A,
–40°C ≤ T_A ≤ 85°C
14.5⁽²⁾
15 15.5⁽²⁾
ΔReg_temp Temperature Variation
–40°C ≤ T_A ≤ 85°C, I_O1 ≤ 0.1 A or I_O2 ≤ 0.1 V_O1 or V_O2
A
±1
ΔReg_line
ΔReg_load
η
V_r
t_tr
ΔV_tr
I_Otrip
Line Regulation
Load Regulation
Efficiency
V_O Ripple (pk-pk)
Transient Response
Over Current Threshold
Short Circuit Current
Over V_I range, balanced load
V_O1 or V_O2
Over I_O1 or I_O2 range, balanced load
V_O1 or V_O2
I_O1 = I_O2
20 MHz bandwidth, C_O = 10 μF tantalum capacitor
0.1 A/μs load step, 50% to 75% I_O1 or I_O2 maximum
V_O1 or V_O2 overshoot/undershoot
V_I = 36 V, reset followed by auto-recovery
Continuous overcurrent trip, I_O1 = I_O2
I_O1(pk) I_O2(pk)
Duty
2.45
±0.05
±0.1
90%
50
30
±1
3
4.5
10%
±0.5
±1
100 ⁽⁴⁾
3.85
V_O1(adj) ,
V_O2(adj)
f_S
V_I on
V_I off
V_IH
V_IL
I_IL
I_I standby
t_ON
C_I
C_O
Output Voltage Adjust
Range
V_O1 and V_O2 adjust simultaneously
Switching Frequency
Under-Voltage Lockout
On/Off Enable (pin 3)
High-level input voltage
Over V_I and I_O ranges
V_I increasing
V_I decreasing
Referenced to –V_I (pin 4)
Low-level input voltage
Low-level input current
Standby Input Current
Pin 3 open circuit
Start-up Time
I_O1 ≤ 1 A or I_O2 ≤ 1 A, V_O1 or V_O2 or rising 0 to 0.95 (typ)
Internal Input Capacitance
External Output
Capacitance
Capacitance from either output to COM (pin 6)
7.2
440
3.6
–0.2
6
0
480 ⁽⁵⁾
33
32
16.7
520
75 ⁽⁶⁾
0.8
–1
2
12
18
3
3000 ⁽⁷
)
MTBF
Reliability
Per Telcordia SR-332 50% stress,
T_A = 40°C, ground benign
2.8
UNIT
W
A
A
V
%V_O
%V_O
%V_O
mV_pp
μs
%V_O
A
A
V
kHz
V
V
mA
mA
ms
μF
μF
10⁶ hrs
(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_O1 is balanced to within ±0.1 A of that flowing into V_O2.
(3) A load imbalance is the difference in current flowing from V_O1 to V_O2. 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_O1 (pin 5) or V_O2 (pin 8), to COM (pin 6).
(5) 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.
(6) 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_I. The open-circuit voltage is 5 V maximum. If it is left open circuit the converter operates
when input power is applied.
(7) 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.
Copyright © 2004–2007, Texas Instruments Incorporated
5