PT6728N [ETC]
Analog IC ; 模拟IC\n
| 型号： | PT6728N |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总8页 (文件大小：193K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT6725 Series
14-A 12V-Input Adjustable
Integrated Switching Regulator
SLTS102A
(Revised 1/14/2002)
Features
• Up to 14A Output Current
• +12V Input
• 93% Efficiency (PT6724)
• On/Off Standby Function
• Differential Remote Sense
• Adjustable Output Voltage
• Short Circuit Protection
• 17-pin Space-Saving Package
• Solderable Copper Case
Description
Pin-Out Information
Pin Function
Ordering Information
The PT6725 series of power modules
are integrated switching regulators (ISRs),
housed in a 17-pin space saving solderable
copper package. These modules operate
off a 12V input power bus to provide up to
14A of low-voltage power for the indus-
try’s latest high-speed, DSPs, µPs, and
bus drivers. The series includes the stan-
dard output bus voltage options, ranging
from 1.2V to 5.0V. The factory preset
voltage can also be adjusted over a limit-
ed range with a single external resistor.
Features include a Standby function,
output short circuit protection, and a
differential Remote Sense to compensate
for voltage drop between the ISR and
load. The modules are available in both
through-hole and surface mount configu-
rations.
PT 6724r = 5.0 Volts
PT 6725r = 3.3 Volts
PT 6726r = 2.5 Volts
PT 6727r = 1.8 Volts
PT 6728r = 1.5 Volts
PT 6729r = 1.2 Volts
1
2
3
4
5
6
Vo Adjust
STBY*
Do Not Connect
Vin
Vin
Vin
7Remote
Sense
Gnd
8
9
GND
GND
PT Series Suffix
(PT1234x)
10 GND
11 GND
12 GND
13 Vout
14 Vout
15 Vout
16 Vout
Case/Pin
Configuration
O rder
Suffix
Package
Code *
Vertical
Horizontal
SMD
N
A
C
(EMD)
(EMA)
(EMC)
* Previously known as package styles 1340/50.
17Remote Sense oVut
(Reference the applicable package code drawing
for the dimensions and PC board layout)
*
For further information, see
application notes.
Standard Application
STBY*
Vout Adjust
REMOTE SENSE (+)
2
1
17
L1
VIN
VOUT
4 - 6
13 - 16
PT6725
1µH
8 - 12
7
+
+
CIN
COUT
LOAD
REMOTE
SENSE (-)
GND
GND
C
C
= Required 1000µF electrolytic
= Required 330µF electrolytic
in
out
L1 = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT6725 Series
14-A 12V-Input Adjustable
Integrated Switching Regulator
Specifications (Unless otherwise stated, Ta =25°C, Vin =12V, Cin =1,000µF, Cout =330µF, and Io =Iomax)
PT6725 SERIES
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
(1)
(1)
Output Current
Io
Ta =+60°C, 200LFM
Vo≤2.5V
0.1
0.1
—
—
14
13
A
Ta =+25°C, natural convection
Vo >2.5V
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Vin
Over Io Range
10.8
—
—
—
—
—
1
0.5
5
13.2
1.5
—
10
10
VDC
%Vo
%Vo
mV
(2)
Vo tol
Regtemp
Regline
Regload
∆Votot
–40° ≤Ta ≤ +85°C, Io =Iomin
Over Vin range
Over Io range
Includes set-point, line, load,
–40° ≤Ta ≤ +85°C
5
mV
—
2
3
%Vo
Efficiency
η
Io =9.0A
Vo =5.0V
Vo =3.3V
Vo
—
—
93
90
—
—
=2.5V
—
—
87—
%
Vo =1.8V
Vo =1.5V
Vo =1.2V
84
—
—
—
—
81
—
78
Vo Ripple (pk-pk)
Transient Response
Vr
ttr
20MHz bandwidth
5A/µs load step, 50% to 100% Iomax
Vo over/undershoot
—
—
—
—
300
35
70
100
20
350
—
—
—
32
mVpp
µs
mV
A
∆Vtr
Isc threshold
ƒs
Short Circuit Threshold
Switching Frequency
Over Vin and Io range
400
kHz
Remote On/Off (Pin 2)
Input High Voltage
Input Low Voltage
Input Low Current
Referenced to –Vin (pin 8)
(3)
VIH
VIL
IIL
—
—
—
–0.5
0.5
—
—
—
Open
+0.4
–
V
–0.1
—
—
330
1,000
-40
-40
mA
mA
µF
µF
°C
°C
Standby Input Current
External Output Capacitance
External Input Capacitance
Operating Temperature Range
Storage Temperature
Iin standby
Cout
Cin
pins 2 & 8 connected
See application schematic
See application schematic
Over Vin range
1.0
15,000
—
(4)
(5)
T
+85
+125
a
T
s
—
—
Reliability
MTBF
Per Bellcore TR-332
6
7.8
—
—
—
10 Hrs
50% stress, Ta =40°C, ground benign
Mechanical Shock
—
Per Mil-Std-883D, method 2002.3,
1ms, half-sine, mounted to a fixture
500
—
G’s
Mechanical Vibration
—
Mil-Std-883D, Method 2007.2,
20-2000Hz, soldered in PCB
(6)
—
—
15
—
—
G’s
Weight
Flammability
—
—
23
grams
Materials meet UL 94V-0
Notes: (1) The ISR will operate at no load with reduced specifications.
(2) If the remote sense feature is not being used, connect the Remote Sense Gnd (pin 7) to GND (pin 8) for optimum output voltage accuracy.
(3) The STBY* control (pin 2) has an internal pull-up and if it is left open circuit the module will operate when input power isapplied. The open-circuit
voltage is typically the input voltage, Vin. Refer to the application notes for other interface considerations.
(4) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. See application notes.
(5) See Safe Operating Area curves or contact the factory for the appropriate derating.
(6) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
Input/Output Capacitors: For proper operation in all applications, the PT6725 series requires a 1,000µF input capacitor (Cin) with a minimum 1.6Arms ripple current
rating. And a 330µF output capacitor (Cout) with a maximum ESR of 50mΩ at 100kHz. For transient or dynamic load applications, additional output capacitance may be
necessary. The maximum allowable output capacitance is 15,000µF. For more information consult the related application note on capacitor recommendations.
Input Inductor: An input filter inductor is optioinal for most applications. The inductor must be sized to handle 6.5ADC with a typical value of 1µH.
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT6725 Series
14-A 12V-Input Adjustable
Integrated Switching Regulator
Characteristic Data; Vin =12V (See Note A)
Safe Operating Area; Vin =12V (See Note B)
Efficiency vs Output Current
PT6724, Vo =5.0V
100
90
80
70
60
50
90
80
VOUT
Airflow
70
60
50
40
30
20
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
200LFM
120LFM
60LFM
Nat Conv
0
2
4
6
8
10
12
14
0
2
4
6
8
8
8
8
10
10
10
10
12
12
12
12
14
14
14
14
Iout (A)
Iout (A)
Output Ripple vs Output Current
PT6725, Vo =3.3V
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
VOUT
5.0V
Airflow
3.3V
2.5V
1.8V
1.5V
1.2V
200LFM
120LFM
60LFM
Nat Conv
0
2
4
6
8
10
12
14
0
2
4
6
Iout (A)
Iout (A)
Power Dissipation vs Output Current
PT6726, Vo =2.5V
10
8
90
80
70
60
50
40
30
20
VOUT
Airflow
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
6
200LFM
120LFM
60LFM
4
Nat Conv
2
0
0
2
4
6
8
10
12
14
0
2
4
6
Iout (A)
Iout (A)
PT6729, Vo =1.2V
90
80
70
60
50
40
30
20
Airflow
200LFM
120LFM
60LFM
Nat Conv
0
2
4
6
Iout (A)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6721/22 & PT6725 Series
Capacitor Recommendations for the 12V-Input
PT6721/22 and PT6725 Series of ISRs
Tantalum Characteristics
Tantalum capacitors are recommended on the output bus
but only AVX TPS Series, Sprague 593D/594/595 Series,
or Kemet T495/T510 Series. These capacitors are recom-
mended over other types due to their higher surge current,
excellent power dissipation and ripple current ratings. As a
caution, the TAJ Series by AVX is not recommended. This
series exhibits considerably higher ESR, reduced power
dissipation and lower ripple current capability. The TAJ
Series is also less reliable compared to the TPS series when
determining power dissipation capability.
Input Capacitors
The recommended input capacitor(s) is determined by
1.6Arms minimum ripple current rating and 1,000µF mini-
mum capacitance. Ripple current and Equivalent Series
Resistance (ESR) values are the major considerations along
with temperature when selecting the proper capacitor.
The tantalum capacitors listed below cannot be used on
the input bus since they are not rated for 12V operation.
Capacitor Table
Output Capacitors
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple cur-
rent (rms) ratings. The suggested minimum quantities
per regulator for both the input and output buses are
identified.
The minimum required output capacitance is 330µF with a
maximum ESR less than or equal to 50mΩ. Failure to
observe this requirement may lead to regulator instability
or oscillation. Electrolytic capacitors have poor ripple
performance at frequencies greater than 400kHz, but
excellent low frequency transient response. Above the
ripple frequency ceramic decoupling capacitors are nec-
essary to improve the transient response and reduce any
microprocessor high frequency noise components apparent
during higher current excursions. Preferred low ESR type
capacitor part numbers are identified in the Table 1 below.
This is not an extensive capacitor list. Capacitors from
other vendors are available with comparable specifications.
Those listed are for guidance. The RMS ripple current rating
and ESR (Equivalent Series Resistance at 100kHz) are the
critical parameters are necessary to insure both optimum
regulator performance and long capacitor life.
Table 1 Capacitors Characteristic Data
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value(µF)
(ESR) Equivalent
Series Resistance
105°C Maximum
Ripple
Physical
Size(mm)
Input
Bus
Output
Bus
Vendor Part Number
Current(Irms)
Panasonic
FC (Radial)
35V
25V
25V
680
1000
1000
0.043Ω
0.038Ω
0.038Ω
1655mA
1655mA
1690mA
12.5×20
12.5×20
16×15
2
1
1
1
2
1
EEUFC1V681
EEUFC1E102
EEUFC1E102S
FC/FK (Surface Mount)
50V
25V
35V
1000
1000
470
0073Ω
0.038Ω
0.043Ω
1610mA
2000mA
1690mA
16×16.5
18×16.5
16×16.5
1
1
2
1
1
1
EEVFK1H102M
EEVFC1E102N
EEVFC1V471N
United Chemi-con
LXV Series
35V
35V
16V
680
1000
470
0.034Ω
0.038Ω
0.084Ω÷2 =0.042Ω
1690mA
1630mA
825mA (×2)
12.5×25
16×20
10×16
2
1
2
1
1
1
LXV35VB680M12X25LL
LXV35VB102M16X20LL
LXV16VB471M10X16LL
Nichicon
PL Series
35V
25V
680
1200
0.036Ω
0.039Ω
1660mA
1600mA
12.5×25
18×15
2
1
1
1
UPL1V681MHH
UPL1E122MHH6
PM Series
35V
1000
0.034Ω
1770mA
16×20
1
1
UPM1V102MHH6
Os-con:
SS
10V
10V
330
330
0.025Ω
0.020Ω
3500mA
3800mA
10×10.5
10.3×10.3
N/R(1)
N/R(1)
1
1
10SS330M (Vo <5V)
10SV330 (Vo <5V)
SV (surface Mount)
AVX Tantalum
TPS (Surface Mount)
10V
10V
330
330
0.1Ω÷2 =0.05Ω
0.06Ω÷2 =0.03Ω
>2500mA
>3000mA
7.3L
×5.7W
×4.1H
N/R(1)
N/R(1)
2
2
TPSE337M010R0100
TPSV337M010R0060
Kemet Tantalum
T510/T495 Series
(Surface Mount)
10V
10V
330
220
0.033Ω
0.07Ω÷2 =0.035Ω
1400mA
>2000mA
4.3W
×7.3L
×4.0H
N/R(1)
N/R(1)
1
2
510X337M010AS
T495X227M0100AS
Sprague Tantalum
594D Series
(Surface Mount)
10V
330
0.045Ω
2360mA
7.2L
×6W
×4.1H
N/R(1)
1
594D337X0010R2T
Note: (N/R -Not recommended) The 10V-rated tantalum capacitors cannot be used on the input bus.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6725 Series
Using the Standby Function of the PT6725
Series of Integrated Switching Regulators
Figure 1
The PT6725 series of power modules are high efficiency
regulators that operate off a +12V input bus voltage.
These regulators incorporate an on/off ‘Standby’ func-
tion, which may be used to disable the regulator output.
2
17
STBY*
Sense(+)
4–6
13–16
VIN
VOUT
The standby function is provided by the STBY* control,
pin 2. If pin 2 is left open-circuit the regulator operates
normally, and provides a regulated output when a valid
supply voltage is applied to Vin (pins 4–6) with respect to
+Vin
Vout
PT6725
GND
Vo(adj)
1
Sense(–)
8–12
7
+
+
CIN
COUT
3
Q1
BSS138
GND (pins 8–12). If a low voltage is then applied to
pin 2 the regulator output will be disabled and the input
current drawn by the ISR will be reduced to 0.5mA .
The standby control may also be used to hold-off the
regulator output during the period that input power is
applied.
STBY
GND
1
GND
Turn-On Time: In the circuit of Figure 1, turning Q1 on
applies a low voltage to the STBY control (pin 2) and
disables the regulator ouput. Correspondingly, turning
Q1 off removes the low-voltage signal and enables the
output. Once enabled, the output will typically experience
a 10–15ms delay followed by a predictable ramp-up of
voltage. The regulator should provide a fully regulated
output voltage within 30ms. Figure 2 shows the output
voltage response, Vo, of a PT6726 (2.5V) following the
turn-off of Q1. The turn-off of Q1 corresponds to the
rise in Vstby. The waveform was measured with a 12Vdc
input voltage, and 9.3ADC resistive load.
Pin 2 is ideally controlled with an open-collector (or
open-drain) discrete transistor (See Figure 1). The open-
circuit voltage is typcially the input voltage Vin. Table 1
gives the circuit parameters for this control input.
Table 1 Standby Control Requirements (2, 3)
Parameter
Min
Typ
Max
Input Low (VIL
)
–0.1V
—
+0.4V
—
Istby (pin 2 =ground)
Vstby (open circuit)
–0.5mA
Vin
—
—
Notes:
1. When the regulator output is disabled the current drawn
from the +Vin input source is typically reduced to 0.5mA.
Figure 2
2
The standby control input requires no external pull-up
resistor. The open-circuit voltage of the STBY* pin is
approximately th input voltage Vin (+12V).
3. The standby control input is Not compatible with TTL
devices that incorporate a totem-pole output drive. Use
only a true open-collector device, preferably a discrete
bipolar transistor (or MOSFET). To ensure the regulator
output is disabled, the control pin must be pulled to less
than 0.4Vdc with a low-level 0.5mA sink to ground.
Vo (1V/Div)
4. After Q1 in Figure 1 is turned off and before the output
begins to rise, the regulator output will assert a low
impedance to ground. If an external voltage is applied to
the output it will sink current and possibly over-stress the
part.
Vstby (10V/Div)
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6725 Series
Adjusting the Output Voltage of the PT6725
Series of Integrated Switching Regulators
Figure 1
The PT6725 series of ISRs are non-programmable
versions of the PT6721/2 Excalibur™ regulators. The
regulators have a fixed output voltage, which may be
adjusted higher or lower than the factory pre-set voltage
using a single external resistor. Table 1 gives the adjust-
ment range for each model in the series as Va (min) and
Va (max).
2
Stby*
17
Sns(+)
4,5,6
13–16
Vout
Vin
+5V
Vo
PT6725
GND
Vo(adj)
1
Sns(-)
7
(R1)
Adj Down
8–12
+
+
L
O
A
D
Cin
Cout
Adjust Up: An increase in the output voltage is obtained by
adding a resistor R2, between pin 1 (Vo Adjust) and pin 7
(Remote Sense GND).
R2
Adjust Up
Adjust Down: Add a resistor (R1), between pin 1 (Vo Adjust)
and pin 17 (Remote Sense Vout).
COM
COM
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the regulator as
possible.
Ro ( Va –Vr )
Vo – Va
(R1)
R2
=
=
– Rs kΩ
2. Never connect capacitors from Vo Adjust to either GND,
Vout, or the Remote Sense pins. Adding capacitance to the
Vo Adjust pin will affect the stability of the ISR.
3. If the Remote Sense feature is not being used, pin 7 must
be connected to pin 8 for optimum output voltage
Ro ·Vr
Va – Vo
– Rs
kΩ
accuracy. The resistors (R1) and R2 may then be connected
from ‘Vo Adjust’ to either Vout or GND respectively.
Where: Vo = Original output voltage
Va = Adjusted output voltage
Vr = The reference voltage (Table 1)
Ro = The multiplier resistance (Table 1)
Rs = The internal series resistance (Table 1)
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT6705/PT6715 Series
Table 1
ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6729
PT6728
PT6727
PT6726
PT6725
PT6724
Vo (nom)
Va (min)
Va (max)
Vr (V)
1.2
1.09
1.52
0.8
1.5
1.47
1.73
1.8
1.75
2.0
2.5
2.25
2.85
3.3
2.75
3.75
5.0
4.01
5.47
1.271.271.271.271.27
Ro (kΩ)
Rs (kΩ)
10.0
24.9
10.2
49.9
10.0
49.9
10.0
33.2
10.0
24.9
9.09
24.9
Table 2
ADJUSTMENT RESISTOR VALUES
Series Pt #
Vo (nom)
PT6729
PT6728
PT6727
PT6726
Series Pt #
Vo (nom)
PT6725
PT6724
1.2V
1.5V
1.8V
2.5V
3.3V
5.0
Va (req’d)
Va (req’d)
2.75
2.8
2.85
2.9
2.95
3.0
3.05
3.1
3.15
3.2
3.25
3.3
3.35
3.4
3.45
3.5
(2.0)kΩ
(5.7)kΩ
1.1
1.15
1.2
1.25
1.3
1.35
1.4
1.45
1.474.7
1.5
1.55
1.6
1.65
1.714.9k
1.75
1.8
(5.1)kΩ
(45.1)kΩ
(10.2)kΩ
(15.9)kΩ
(23.1)kΩ
(32.8)kΩ
(46.3)kΩ
(66.6)kΩ
(100.0)kΩ
(168.0)kΩ
(371.0)kΩ
135.0kΩ
55.1kΩ
28.4kΩ
15.1kΩ
7.1kΩ
Ω
k
(18.1)kΩ
1.8kΩ
209.0kΩ
79.6kΩ
36.5kΩ
Ω
229.0kΩ
102.0kΩ
59.8kΩ
38.6kΩ
25.9kΩ
17.4kΩ
11.4kΩ
Ω
(46.1)kΩ
3.55
3.6
3.65
3.76.9k
3.75
·
1.85
1.9
1.95
2.0
2.05
2.1
204.0kΩ
77.1kΩ
34.8kΩ
13.6kΩ
3.3kΩ
4.1
4.2
(3.7)kΩ
(8.4)kΩ
2.15
2.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
(14.4)kΩ
(22.5)kΩ
(33.8)kΩ
(50.8)kΩ
(79.0)kΩ
(136.0)kΩ
(305.0)kΩ
2.25
2.3
2.35
2.4
2.45
2.5
2.55
2.6
2.65
2.730.3k
2.75
2.8
2.85
R1 = (Blue)
(6.0)kΩ
(18.3)kΩ
(38.8)kΩ
(79.8)kΩ
(203.0)kΩ
221.0kΩ
93.8kΩ
51.5kΩ
Ω
90.5kΩ
32.8kΩ
13.6kΩ
4.0kΩ
17.6kΩ
9.1kΩ
3.1k
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com
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相关型号：
PT6882A
5A SWITCHING REGULATOR, 600kHz SWITCHING FREQ-MAX, SMA18, HORIZONTAL THROUGH HOLE, SIP-18
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