PTB48510_14 Datasheet, PDF (4/18 Pages) Texas Instruments – DUAL COMPLEMENTARY-OUTPUT DC/DC CONVERTER FOR DSL

Not Recommended for New Designs
PTB48510
PTB48511
SLTS219F – FEBRUARY 2004 – REVISED MARCH 2007
www.ti.com
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
PTB4851xB
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_O1or V_O1
Over V_I range, I_O1 ≤ 0.1 A or I_O2 ≤ 0.1 A ≤ 0.1 A
I_O1 ≥ 0.1 A, I_O2 ≥ 0.1 A
0
72 ⁽¹⁾
0
3 ⁽²⁾
0
1 ⁽³⁾
V_O1 or V_O2 Output Voltage
Includes set point, line, load, I_O1 ≤ 0.1 A or I_O2 ≤ 0.1 A ≤
0.1 A
–40°C ≤ T_A ≤ 85°C
11.6⁽²⁾
12 12.4⁽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
Line Regulation
Over V_I range, balanced load
V_O1 or V_O2
±0.05 ±0.5
ΔReg_load Load Regulation
Over I_O1 or I_O2 range, balanced load
V_O1 or V_O2
±0.1
±1
η
Efficiency
89%
V_r
V_O Ripple (pk-pk)
20 MHz bandwidth, C_O = 10 μF tantalum capacitor
20 80⁽⁴⁾
t_tr
Transient Response
0.1 A/μs load step, 50% to 75% I_O1 or I_O2 maximum
30
ΔV_tr
V_O1 or V_O2 overshoot/undershoot
±1
I_Otrip
Overcurrent Threshold
V_I = 36 V, reset followed by auto-recovery
3.3
3.8
5
V_O1(trip),
V_O2(trip)
Overvoltage Threshold
Outputs latched off ⁽⁵⁾
PTB48510A NA
PTB48511A
14
NA
15.8
17
Short Circuit Current
Continuous overcurrent trip, I_O1 = I_O2
I_O1(pk) I_O2(pk)
Duty
6
10%
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 rising 0 to 0.95 (typ)
Internal Input Capacitance
External Output
Capacitance
Capacitance from either output to COM (pin 6)
6.5
13.4
440
480⁽⁶⁾ 500
33
32
3.6
–0.2
6
0
75 ⁽⁷⁾
0.8
–1
2
12
18
3
3000 ⁽⁸
)
MTBF
Reliability
Per Telcordia SR-332 50% stress,
T_A = 40°C, ground benign
PTB48510B 2.8
PTB48511B 2.5
UNIT
W
A
A
V
%V_O
%V_O
%V_O
mV_pp
μs
%V_O
A
V
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) If the overvoltage 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_I. The open-circuit voltage is 5 V maximum. If it is left open circuit the converter operates
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.
4
Copyright © 2004–2007, Texas Instruments Incorporated