PTB48511BAH [TI]
2-OUTPUT 72W DC-DC REG PWR SUPPLY MODULE, ROHS COMPLIANT, DIP-8;
| 型号： | PTB48511BAH |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 2-OUTPUT 72W DC-DC REG PWR SUPPLY MODULE, ROHS COMPLIANT, DIP-8 转换器 |
| 文件： | 总13页 (文件大小：359K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PTB48510, PTB48511
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
Features
• Dual Complementary Outputs
( 5 V, 12 V, or 15 V)
• Input Voltage Range:
36 V to 75 V
• On/Off Enable for Sequencing
• 1500 VDC Isolation
• Over-Current Protection
• Over Voltage Protection
(PTB48511 only)
• Under-Voltage Lockout
• Temp Range: –40 to +100 °C
• Industry Standard Outline
• Fixed Frequency Operation
• Synchronizes with PTB48500
• Powers line driver ICs for AC-7
and other xDSL chipsets
• Safety Approvals:
EN60950
• Over-Temperature Shutdown
UL/cUL60950
Description
Pin Configuration
The PTB4851x series of isolated
DC/DC converter modules produce a
complementary pair of regulated supply
voltages for powering line-driver ICs in
xDSL telecom applications. The mod-
ules operate from a standard telecom
(-48 V) central office (CO) supply and
can provide up to a 72 W of power in a
balanced load configuration.
Pin Function
The PTB48511 adds output over-voltage
protection (OVP).
1
2
3
4
5
6
7
8
+Vin
Sync In
Enable *
–Vin
The control inputs, “Enable” and
“Sync In,” are compatible with the “EN
Out” and “Sync Out” signals of the
PTB48500 DC/DC converter. This
allows the power-up and switching fre-
quency of the PTB4851x modules to be
directly controlled from a PTB48500.
Together the PTB48500 and PTB4851xA
converters meet all the system power
and sequencing requirements of the AC-7
ADSL chipset.
The PTB4851x uses double-sided
surface mount technology contruction.
The package size is based on the industry
standard outline and does not require a
heatsink. Both through-hole and surface
mount pin configurations are available.
+Vout
COM
Vo Adjust
–Vout
Shaded functions indicate signals
that are referenced to –Vin.
The A-suffix module ( 5 V) is designed
to power the line driver ICs for the AC-7
ADSL chipset. Other voltage options will
power other analog applications requiring
a complementary supply with relatively
balanced loads.
Both the PTB48510 and PTB48511
include an “on/off” enable control, output
current limit, over-temperature protection,
and input under-voltage lockout (UVLO).
*
Denotes negative logic:
Open
–Vin
= Outputs Off
= Normal operation
Stand-Alone Application
PTB4851x
+VIN
+VOUT
1
5
+Vin
+VOUT
L
O
A
D
2
3
Sync In
Enable
7
6
±Vo Adj
COM
COM
–VIN
4
L
O
A
D
–Vin
–VOUT
8
–VOUT
For technical support and further information visit http://power.ti.com
PTB48510, PTB48511
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
Ordering Information
Base Pt. No. (PTB4851❒xxx)
Output Voltage
Package Options
(PTB4851x❒xx) (PT4851xx❒❒)
(2)
Order Prefix
Description
Code
A
Voltage
Code
AH
AS
Description
Horiz. T/H
SMD, Standard (3)
Pkg Ref.
(ERK)
(ERL)
PTB48510xxx
PTB48511xxx
Basic Model
Adds Output OVP
5 V
12 V
(1)
B
C
(4)
15 V
Notes: (1) Output Over-Voltage Protection.
(2) Reference the applicable package reference drawing for the dimensions and PC board layout
(3) “Standard” option specifies 63/37, Sn/Pb pin solder material.
(4) 1ꢀ-V output is not available with the PꢁT4ꢂꢀ11
Pin Descriptions
+Vin: The positive input supply for the module with respect
Vo Adjust: Using a single resistor, this pin allows the
magnitude of both ‘+Vout’ and ‘–Vout’ to be adjusted
together, either higher or lower than their preset value. If
not used, this pin should be left open circuit.
to –Vin. When powering the module from a –48 V telecom
central office supply, this input is connected to the primary
system ground.
–Vin: The negative input supply for the module, and the
0 VDC reference for the ‘Enable*’, and ‘Sync In’ signals.
When the module is powered from a +48-V supply, this
input is connected to the 48-V Return.
Enable*: This is an open-collector (open-drain) negative
logic input that enables the module output. This pin is
referenced to -Vin. A logic ‘0’ at this pin enables the
module’s outputs, and a high impedance disables the
outputs. If this feature is not used the pin should be con-
nected to –Vin. Note: Connecting this input directly to the
“EN Out” pin of the PꢁT4ꢂꢀ0x enables the output voltages
from both converters (PꢁT4ꢂꢀ0x and PꢁT4ꢂꢀ1x) to power
up in sequence.
+Vout: The positive output supply voltage, which is ref-
erenced to the ‘COM’ node. The voltage at ‘+Vout’ has the
same magnitude, but is the complement to that at ‘-Vout’.
–Vout: The negative output supply voltage, which is ref-
erenced to the ‘COM’ node. The voltage at ‘-Vout’ has the
same magnitude, but is the complement to that at ‘+Vout’.
Sync In: This pin is used when the PTB4851x and PTB4850x
DC/DC converter modules are used together. Connect-
ing this pin to the ‘Sync Out’ of the PTB4850x module
allows the PTB4851x to be synchronized to the same
switch conversion frequency as the PTB4850x.
COM: The secondary return reference for the module’s
regulated output voltages. This node is dc isolated from
the input supply pins.
Environmental and General Specifications (Unless otherwise stated, all voltages are with respect to –Vin
)
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Input Voltage Range
Vin
Over output load range
36
48
75
VDC
Isolation Voltage
Capacitance
Resistance
Input–output/input–case
Input to output
1500
—
—
—
—
—
V
1500
—
pF
MΩ
Input to output
10
Operating Temperature Range
Over-Temperature Protection
T
OTP
Over Vin Range
Shutdown threshold
Hysterisis
–40
—
—
—
115
10
+85
—
—
°C
a
(i)
°C
(ii)
Solder Reflow Temperature
Storage Temperature
Mechanical Shock
Treflow
T
s
Surface temperature of module body or pins
—
Per Mil-STD-883D, Method 2002.3
1 msec, ½ Sine, mounted
235
125
—
—
°C
°C
–40
—
—
—
500
250
T/H
G’s
SMD
Mechanical Vibration
Mil-STD-883D, Method 2007.2
20-2000 Hz
T/H
—
—
10
5
—
—
G’s
SMD
Weight
Flammability
—
—
—
28
—
grams
Meets UL 94V-O
Notes: (i) ꢁhis parameter is guaranteed be design
(ii) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum.
For technical support and further information visit http://power.ti.com
PTB48510A, PTB48511A
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
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
Po
| Io |
|+Io | – |–Io |
| Vo|
Conditions
Min
0
0
0
4.75
Typ
—
—
—
5
Max
65
6.5
1
Units
W
A
A
V
(1)
(2)
(3)
(2)
Output Power
Total output power from Vo
Over Vin range, |+Io |– |–Io | ≤ 0.1 A
|+Io | ≥0.1 A, |–Io | ≥ 0.1 A
Inlcudes set-point, line, |+Io | – |–Io | ≤ 0.1 A
–40 ≤Ta ≤+85°C
Output Current
Output Load Imbalance
Output Voltage
(2)
5.25
Temperature Variation
∆Regtemp
–40 ≤Ta ≤ +85°C, | Io |=0.1 A
+Vo
–Vo
—
—
1
1
—
—
%Vo
Line Regulation
Load Regulation
Efficiency
∆Reg
∆Regload
η
Over Vin range, balanced load
Over Io range, balanced load
Vo
Vo
—
—
—
0.1
0.2
86
0.4
0.4
—
%Vo
%Vo
%
line
Vo Ripple (pk-pk)
Vr
20 MHz bandwidth,
(4)
—
20
30
mVpp
Co =10 µF tantalum capacitor
Transient Response
ttr
∆Vtr
Iotrip
0.1 A/µs load step, 50% to 75% Iomax
| Vo |over/undershoot
—
—
30
1.0
—
—
µs
%Vo
Over Current Threshold
Over-Voltage Threshold
Short Circuit Current
Vin =36 V
6.8
7.5
10
A
reset followed by auto-recovery
(5)
| Vo|trip
Outputs latched off
PTB48510
PTB48511
N/A
5.9
—
—
3.5
440
—
—
12.5
10
—
470
N/A
7
—
—
5.5
500
V
Continuous over-current trip,
| Io |pk
Duty
A
%
V
kHz
V
|+Io | = |–Io |
Output Voltage Adjust Range
Switching Frequency
Under-Voltage Lockout
| Vo|adj
ƒs
Vinon
Vinoff
|+Vo | and |–Vo | adjust simulataneously
Over Vin and Io ranges
Vin increasing
Vin decreasing
(6)
—
—
33
32
—
—
On/Off Enable (pin 3)
Input High Voltage
Referenced to –Vin (pin 4)
(7)
+0.8
VIH
VIL
IIL
+3.6
–0.2
—
—
6
—
0
2.7
2.5
—
—
—
2
10
3
—
+75
V
Input Low Voltage
Input Low Current
–1
—
22
—
mA
mA
ms
µF
Standby Input Current
Start-up Time
Internal Input Capacitance
External Output Capacitance
Reliability
Iin standby
ton
Cin
Co
MTBF
pin 3 open circuit
| Io | =1 A, | Vo | rising 0 to 0.95 | Vo | typ
(8)
Capacitance from either output to COM (pin 6)
5,000
µF
Per Bellcore TR-332
PTB48510A
—
—
—
—
6
10 Hrs
50% stress, Ta =40°C, gnd benign PTB48511A
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. ꢁhe 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 ꢀ) or –Vo (pin ꢂ), to COM (pin 6).
(ꢀ) If the over-voltage threshold is exceeded by either regulated output the module will shut down, turning both outputs off. ꢁhis is a latched condition, which
can only by reset by removing and then re-applying the module’s input power.
(6) ꢁhis is the free-running frequency. ꢁhe module can be made to synchronize with the PꢁT4ꢂꢀ00 when both modules are used together in a system.
(7) ꢁhe On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor. ꢁhe input is diode protected
and may be connected to +Vin. ꢁhe open-circuit voltage is ꢀ V max. If it is left open circuit the converter will operate when input power is applied.
(ꢂ) 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.
For technical support and further information visit http://power.ti.com
PTB48510A, PTB48511A
Typical Characteristics
65-W Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
PTB4851xA Characteristic Data @VIN =48 V (See Notes A)
Safe Operating Area PTB4851xA (See Note C)
Efficiency vs Load Current (See Note T)
Balanced Load, VIN =48 VDC (See Note T)
100
90
80
90
80
70
60
50
Airflow
70
60
50
40
30
20
400LFM
200LFM
100LFM
Nat Conv
0
1
2
3
4
5
6
0
1
2
3
4
5
6
|±IOUT| (Balanced)
A
|± Iout| (A)
Power Dissipation vs Load Current (See Note T)
12
10
8
6
4
2
0
0
1
2
3
4
5
6
|±IOUT| (Balanced)
A
Cross Regulation, ∆|+VO| vs |–IO|, with |+IO| = 1 A
300
200
100
0
-100
-200
-300
0
1
2
3
4
5
6
Load Current |–IO| - A
Cross Regulation, ∆|–VO| vs |+IO|, with |–IO| = 1 A
300
200
100
0
-100
-200
-300
0
1
2
3
4
5
6
Load Current |+IO| - A
Note A: Characteristic data has been developed from actual products tested at 2ꢀ°C. ꢁhis data is considered typical data for the converter.
Note B: Under a balanced load, current flowing out of +Vo is equal to that flowing into –Vo.
Note C: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to
modules soldered directly to a 4 in. × 4 in. double-sided PCT with 1 oz. copper.
For technical support and further information visit http://power.ti.com
PTB48510B, PTB48511B
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
Specifications (Unless otherwise stated, Ta =25°C, Vin =48 V, Cin =0 µF, Co =0 µF, |+Io | = |–Io |, and | Io | =0.5 | Io
|
)
max
PTB4851xB
Characteristic
Symbol
Po
| Io |
|+Io | – |–Io |
| Vo|
Conditions
Min
0
0
0
11.6
Typ
—
—
—
12
Max
72
3
1
12.4
Units
W
A
A
V
(1)
(2)
(3)
(2)
Output Power
Total output power from Vo
Over Vin range, |+Io |– |–Io | ≤ 0.1 A
|+Io | ≥0.1 A, |–Io | ≥ 0.1 A
Inlcudes set-point, line, |+Io | – |–Io | ≤ 0.1 A
–40 ≤Ta ≤+85°C
Output Current
Output Load Imbalance
Output Voltage
(2)
Temperature Variation
Line Regulation
Load Regulation
Efficiency
∆Regtemp
–40 ≤Ta ≤ +85°C, | Io |=0.1 A
Over Vin range, balanced load
Over Io range, balanced load
Vo
Vo
Vo
—
—
—
—
1
—
0.5
1
%Vo
%Vo
%Vo
%
∆Reg
0.05
0.1
89
line
∆Regload
η
—
Vo Ripple (pk-pk)
Vr
20 MHz bandwidth,
(4)
—
20
80
mVpp
Co =10 µF tantalum capacitor
Transient Response
ttr
∆Vtr
Iotrip
0.1 A/µs load step, 50% to 75% Iomax
| Vo |over/undershoot
—
—
30
1
—
—
µs
%Vo
Over Current Threshold
Over-Voltage Threshold
Short Circuit Current
Vin =36 V
3.3
3.8
5
A
reset followed by auto-recovery
(5)
| Vo|trip
Outputs latched off
PTB48510A
PTB48511A
N/A
14
—
—
6.5
440
—
N/A
17
—
—
13.4
520
V
15.8
Continuous over-current trip,
| Io |pk
Duty
6
10
—
480
33
32
A
%
V
kHz
V
|+Io | = |–Io |
Output Voltage Adjust Range
Switching Frequency
Under-Voltage Lockout
| Vo|adj
ƒs
Vinon
Vinoff
|+Vo | and |–Vo | adjust simulataneously
Over Vin and Io ranges
Vin increasing
Vin decreasing
(6)
—
—
—
—
On/Off Enable (pin 3)
Input High Voltage
Referenced to –Vin (pin 4)
(7)
+0.8
VIH
VIL
IIL
+3.6
–0.2
—
—
6
—
0
2.8
2.5
—
—
—
2
12
3
—
+75
V
Input Low Voltage
Input Low Current
–1
—
18
—
mA
mA
ms
µF
Standby Input Current
Start-up Time
Internal Input Capacitance
External Output Capacitance
Reliability
Iin standby
ton
Cin
Co
MTBF
pin 3 open circuit
| Io | =1 A, | Vo | rising 0 to 0.95 | Vo | typ
(8)
Capacitance from either output to COM (pin 6)
3,000
µF
Per Bellcore TR-332
PTB48510B
—
—
—
—
6
10 Hrs
50% stress, Ta =40°C, gnd benign PTB48511B
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. ꢁhe 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 ꢀ) or –Vo (pin ꢂ), to COM (pin 6).
(ꢀ) If the over-voltage threshold is exceeded by either regulated output the module will shut down, turning both outputs off. ꢁhis is a latched condition, which
can only by reset by removing and then re-applying the module’s input power.
(6) ꢁhis is the free-running frequency. ꢁhe module can be made to synchronize with the PꢁT4ꢂꢀ00 when both modules are used together in a system.
(7) ꢁhe On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor. ꢁhe input is diode protected
and may be connected to +Vin. ꢁhe open-circuit voltage is ꢀ V max. If it is left open circuit the converter will operate when input power is applied.
(ꢂ) 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.
For technical support and further information visit http://power.ti.com
PTB48510B, PTB48511B
Typical Characteristics
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
PTB4851xB Characteristic Data @VIN =48 V (See Notes A)
Safe Operating Area PTB4851xB (See Note C)
Efficiency vs Load Current (See Note T)
Balanced Load, VIN =48 VDC (See Note T)
100
90
80
90
80
70
60
50
Airflow
70
60
50
40
30
20
400LFM
200LFM
100LFM
Nat conv
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
|±IOUT| (Balanced)
A
|±Iout| (A)
Power Dissipation vs Load Current (See Note T)
12
10
8
6
4
2
0
0
0.5
1
1.5
2
2.5
3
|±IOUT| (Balanced Load)
A
Cross Regulation, ∆|+VO| vs |–IO|, with |+IO| = 1 A
400
200
0
-200
-400
0
0.5
1
1.5
2
2.5
3
Load Current |–IO| - A
Cross Regulation, ∆|–VO| vs |+IO|, with |–IO| = 1 A
400
200
0
-200
-400
0
0.5
1
1.5
2
2.5
3
Load Current |+IO| - A
Note A: Characteristic data has been developed from actual products tested at 2ꢀ°C. ꢁhis data is considered typical data for the converter.
Note B: Under a balanced load, current flowing out of +Vo is equal to that flowing into –Vo.
Note C: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to
modules soldered directly to a 4 in. × 4 in. double-sided PCT with 1 oz. copper.
For technical support and further information visit http://power.ti.com
PTB48510C
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
Specifications (Unless otherwise stated, Ta =25°C, Vin =48 V, Cin =0 µF, Co =0 µF, |+Io | = |–Io |, and | Io | =0.5 | Io
|
)
max
PTB48510C
Characteristic
Symbol
Po
| Io |
|+Io | – |–Io |
| Vo|
Conditions
Min
0
0
0
14.5
Typ
—
—
—
15
Max
66
2.2
1
Units
W
A
A
V
(1)
(2)
(3)
(2)
Output Power
Total output power from Vo
Over Vin range, |+Io |– |–Io | ≤ 0.1 A
|+Io | ≥0.1 A, |–Io | ≥ 0.1 A
Inlcudes set-point, line, |+Io | – |–Io | ≤ 0.1 A
–40 ≤Ta ≤+85°C
Output Current
Output Load Imbalance
Output Voltage
(2)
15.5
Temperature Variation
Line Regulation
Load Regulation
Efficiency
∆Regtemp
–40 ≤Ta ≤ +85°C, | Io |=0.1 A
Over Vin range, balanced load
Over Io range, balanced load
| Io| =| Io (max)|
Vo
Vo
Vo
—
—
—
—
1
—
0.5
1
%Vo
%Vo
%Vo
%
∆Reg
0.05
0.1
90
line
∆Regload
η
—
Vo Ripple (pk-pk)
Vr
20 MHz bandwidth,
(4)
—
50
100
mVpp
Co =10 µF tantalum capacitor
Transient Response
ttr
∆Vtr
Iotrip
0.1 A/µs load step, 50% to 75% Iomax
| Vo |over/undershoot
—
—
30
1
—
—
µs
%Vo
Over Current Threshold
Short Circuit Current
Vin =36 V
2.45
3
3.85
A
reset followed by auto-recovery
Continuous over-current trip,
| Io |pk
Duty
—
—
7.2
440
—
—
4.5
10
—
480
33
32
—
—
16.7
520
—
—
A
%
V
kHz
V
|+Io | = |–Io |
Output Voltage Adjust Range
Switching Frequency
Under-Voltage Lockout
| Vo|adj
ƒs
Vinon
Vinoff
|+Vo | and |–Vo | adjust simulataneously
Over Vin and Io ranges
Vin increasing
Vin decreasing
(5)
On/Off Enable (pin 3)
Input High Voltage
Referenced to –Vin (pin 4)
(6)
+0.8
VIH
VIL
IIL
+3.6
–0.2
—
—
6
—
0
—
—
—
2
12
3
—
+75
V
Input Low Voltage
Input Low Current
–1
—
18
—
mA
mA
ms
µF
Standby Input Current
Start-up Time
Internal Input Capacitance
External Output Capacitance
Reliability
Iin standby
ton
Cin
Co
MTBF
pin 3 open circuit
| Io | =1 A, | Vo | rising 0 to 0.95 | Vo | typ
(7)
Capacitance from either output to COM (pin 6)
Per Bellcore TR-332
50% stress, Ta =40°C, gnd benign
3,000
µF
6
2.8
—
—
10 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 +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. ꢁhe 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 ꢀ) or –Vo (pin ꢂ), to COM (pin 6).
(ꢀ) ꢁhis is the free-running frequency. ꢁhe module can be made to synchronize with the PꢁT4ꢂꢀ00 when both modules are used together in a system.
(6) ꢁhe On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor. ꢁhe input is diode protected
and may be connected to +Vin. ꢁhe open-circuit voltage is ꢀ V max. If it is left open circuit the converter will operate 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.
For technical support and further information visit http://power.ti.com
PTB48510C
Typical Characteristics
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
PTB48510C Characteristic Data @VIN =48 V (See Notes A)
Safe Operating Area PTB48510C (See Note C)
Efficiency vs Load Current (See Note T)
Balanced Load, VIN =48 VDC (See Note T)
100
90
80
90
80
70
60
50
70
Airflow
60
400LFM
200LFM
100LFM
Nat conv
50
40
30
20
0
0.3
0.6
0.9
|±IOUT
1.2
(A)
1.5
1.8
2.1
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
|±IOUT| (Balanced)
A
|
Power Dissipation vs Load Current (See Note T)
10
8
6
4
2
0
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
|±IOUT| (Balanced)
A
Cross Regulation, ∆|+VO| vs |–IO|, with |+IO| = 1 A
300
200
100
0
-100
-200
-300
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
Load Current |-IO| - A
Cross Regulation, ∆|–VO| vs |+IO|, with |–IO| = 1 A
300
200
100
0
-100
-200
-300
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
Load Current |+IO| - A
Note A: Characteristic data has been developed from actual products tested at 2ꢀ°C. ꢁhis data is considered typical data for the converter.
Note B: Under a balanced load, current flowing out of +Vo is equal to that flowing into –Vo.
Note C: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to
modules soldered directly to a 4 in. × 4 in. double-sided PCT with 1 oz. copper.
For technical support and further information visit http://power.ti.com
Application Notes
PTB48510 & PTB48511
Adjusting the Output Voltages of the
PTB4851x Series of DC/DC Converters
The PTB48510 & PTB48511 DC/DC converters produce
a balanced pair of complimentary output voltages. They
are identified +VOUT and -VOUT, respectively. The mag-
nitude of both output voltages can be adjusted together
as a pair, higher or lower, by up to 10% of their nominal.
The adjustment method uses a single external resistor. 1
The value of the resistor determines the adjustment
magnitude, and its placement determines whether the
magnitude is increased or decreased. The resistor values
can be calculated using the appropriate formula (see
below). The formula constants are given in Table 1-1.
The placement of each resistor is as follows.
Calculation of Resistor Adjust Values
The value of the adjust resistor is calculated using one of
the following equations. Use the equation for R1 to adjust
up, or (R2) to adjust down.
Vr Ro
2 (Va – Vo )
R1 [Adjust Up]
=
=
– Rs kΩ
– Rs kΩ
Ro (2 Va – Vr )
2 (Vo – Va )
(R2) [Adjust Down]
Adjust Up: 3 To increase the magnitude of both output
voltages, place a resistor R1 between Vo1 Adj (pin 7) and
the -VOUꢁ (pin 8) voltage rail; see Figure 1-1(a).
Where: Vo = Magitude of the original VOUT
= Magnitude of the adjusted voltage
V
a
Vr = The reference voltage from Table 1-1
Ro = The resistance value in Table 1-1
Rs = The series resistance from Table 1-1
Figure 1-1a
PTB48510
+VOUT
5
+VOUT
Table 1-1
ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
PTB4851xA
PTB4851xB
PTB48510C
7
±Vo Adj
Vo(nom)
Va(min)
Va(max)
Vr
Ro (kΩ)
Rs (kΩ)
5 V
3.5 V
5.5 V
2.495 V
7.5
12 V
6.5 V
13.4 V
2.495 V
18.2
15 V
7.2 V
16.7 V
2.495 V
22.1
6
COM
R1
Adjust Up
–VOUT
8
–VOUT
9.09
16.9
16.9
Notes:
1. A 0.05 W rated resistor may be used. The tolerance
should be 1%, with a temperature stability of 100 ppm/°C
or better. Place the resistor in either the R1 or (R2)
location, as close to the converter as possible.
Adjust Down: To decrease the magnitude of both output
voltages, add a resistor (R2), between Vo Adj (pin 7) and
the +VOUꢁ (pin 5) voltage rail; see Figure 1-1(b).
2. Never connect capacitors to the Vo Adj pin. Capacitance
added to this pin can affect the stability of the regulated
output.
Figure 1-1b
3. The over-voltage protection (PTB48511x) is nominally
set to 25% above the original output voltage set-point.
Increasing the magnitude of the output voltages reduces
the margin between the output voltage and the over-
voltage (OV) protection threshold. This could make the
module more sensitive to OV faults, as a result of
random noise and load transients.
PTB48510
+VOUT
5
+VOUT
(R2)
Adj Down
7
±Vo Adj
6
COM
Note: An OV fault is a latched condition that shuts down the
converter’s outputs. ꢁhe fault can only be cleared by cycling the
Enable pin, or by momentarily removing input power to the
module.
–VOUT
8
–VOUT
For technical support and further information visit http://power.ti.com
Application Notes
PTB4850x & PTB4851x
Configuring the PTB4850x & PTB4851x DC/DC
Converters for DSL Applications
Power-Up Sequencing
The desired power-up sequence for the AC7 supply volt-
ages requires that the two logic-level voltages from the
PTB4850x converter rise to regulation prior to the two
complementary voltages that power the transceiver ICs.
This sequence cannot be guaranteed if the PTB4850x
and PTB4851x are allowed to power up independently,
especially if the 48-V input voltage rises relatively slowly.
To ensure the desired power-up sequence, the “EN Out”
pin of the PTB4850x is directly connected to the active-
low “Enable” input of the PTB4851x (see Figure 2-1).
This allows the PTB4850x to momentarily hold off the
outputs from the PTB4851x until the logic-level voltages
have risen first. Figure 2-2 shows the power-up wave-
forms of all four supply voltages from the schematic of
Figure 2-1.
When operated as a pair, the PTB4850x and PTB4851x
converters are specifically designed to provide all the
required supply voltages for powering xDSL chipsets.
The PTB4850x produces two logic voltages. They include
a 3.3-V source for logic and I/O, and a low-voltage for
powering a digital signal processor core. The PTB4851x
produces a balanced pair of complementary supply voltages
that is required for the xDSL transceiver ICs. When used
together in these types of applications, the PTB4850x and
PTB4851x may be configured for power-up sequencing,
and also synchronized to a common switch conversion
frequency. Figure 2-1 shows the required cross-connects
between the two converters to enable these two features.
Figure 2-2; Power-Up Sequencing Waveforms
Switching Frequency Synchronization
Unsynchronized, the difference in switch frequency
introduces a beat frequency into the input and output
AC ripple components from the converters. The beat
frequency can vary considerably with any slight variation
in either converter’s switch frequency. This results in a
variable and undefined frequency spectrum for the ripple
waveforms, which would normally require separate filters
at the input of each converter. When the switch frequency
of the converters are synchronized, the ripple components
are constrained to the fundamental and higher. This
simplifies the design of the output filters, and allows a
common filter to be specified for the treatment of input
ripple.
VCCIO (1 V/Div)
VCORE(1 V/Div)
+VTCVR (5 V/Div)
–VTCVR (5 V/Div)
HORIZ SCALE: 10 ms/Div
Figure 2-1; Example of PTB4850x & PTB4851x Modules Configured for DSL Applications
9
Vo2 Adj
–48 V RTN
–48 V
1
10
6
+Vin
Vo1
Vo2
+
–
VCCIO
VCORE
PTB48500A
Input
Filter
3
5
8
Enable
–Vin
POR
COM
7
POR
EN Out Sync Out
4
2
2
7
Sync In
±Vo Adj
1
5
6
8
+Vin
+Vo
COM
–Vo
+VTCVR
PTB48510A
3
Enable
–Vin
4
–VTCVR
For technical support and further information visit http://power.ti.com
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相关型号：
PTB48540CAZ
IC 1-OUTPUT 10 W DC-DC REG PWR SUPPLY MODULE, ROHS COMPLIANT, PACKAGE-13, Power Supply Module
TI
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