DCT104803P [TI]
SWITCHING REGULATOR, 440kHz SWITCHING FREQ-MAX, PDIP22, PLASTIC, DIP-28;
| 型号： | DCT104803P |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SWITCHING REGULATOR, 440kHz SWITCHING FREQ-MAX, PDIP22, PLASTIC, DIP-28 开关 光电二极管 |
| 文件： | 总11页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DCT104803
DCT104805
SLVS407 – OCTOBER 2001
10-WATT ISOLATED TELECOMS DC/DC CONVERTER
D
D
Central Office Line Cards
Point-of-Use Power Conversion
FEATURES
D
D
D
D
28-Pin (0.6″ Wide) PDIP and SMD
Output Variants: 5 V, 3.3 V
Input Range: 32 V – 75 V
DESCRIPTION
The DCT1048 family is a series of galvanically isolated
dc/dc converters designed for telecommunications
applications. With a low component count and highly
compact magnetics sets, the devices offer extremely
high power density in JEDEC standard with through-
hole and surface-mount IC packages. The unique
application of custom-level silicon integration, together
with an advanced thermal design, provides extremely
high reliability and allows operation at ambient
temperatures up to 85°C.
High Reliability (Measured): TBD Failures In
Time (FITs)
D
D
D
D
D
D
D
1500 V
Isolation
RMS
Basic Insulation
Remote Sensing
Remote Shutdown
Undervoltage Lockout
Soft Start
85°C Operation (No Heatsinking)
Thecircuitprovidesisolationto1500V
requirements
,meetingthe
RMS
of
UL1950/CSA22.2/EN
60950
APPLICATIONS
(pending), with basic insulation to 75 V. The
DCT10480x is a part of Texas Instrument’s range of
isolated dc/dc converters.
D
Network Access Equipment
functional block diagram
Output
Choke
Isolating
Transformer
0 V
O
V
I
Primary
Control
IC
V
O
0 V
I
Rectifiers
REF
Isolation
Reference
RSD
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCT PREVIEW information concerns products in the formative or
Copyright 2001, Texas Instruments Incorporated
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
NVM/DVM PACKAGE
(TOP VIEW)
1
2
3
4
28
27
26
25
PWMa
0 V
RSD
0 V
0 V
(dev)
I
V
I
(dev)
SNUB1
SNUB2
7
8
0 V
PWMb
(dev)
21
20
19
18
17
16
15
DNC
V
V
O
O
BIAS
COMP
10
11
12
13
14
DNC
DNC
0 V
(sense)
REF
0 V
0 V
O
O
NC
NC – No internal connection
AVAILABLE OPTIONS
PACKAGE
T
A
PLASTIC
(DIL)
PLASTIC DIL
(GULLWING)
DCT104803P
DCT104805P
DCT104803P-U
DCT104805P-U
–40°C to 85°C
†
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 V
I
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 125°C
stg
Operating ambient temperature, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 85°C
Lead temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270°C
A
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
electrical characteristics, T = 25°C, V = 48 VDC, V set to nominal output voltage, Load = 2A
A
I
O
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
32
TYP
MAX
75
UNIT
V
I
Input voltage range
V
V = 32 V–75 V,
See Figure 1
Relative to V = 48 V,
I
I
Line regulation
±0.2
±0.5
%V
V
O
Under voltage lockout
See Figure 1
28
3.5
Input current during remote shutdown
Reference voltage
V = 75 V,
I
See Figure 1
mA
V
V
ref
See output voltage programming section
1.223 1.238
1.252
DCT104803 See Figure 1
DCT104805 See Figure 1
3.3
5
V
Nominal output voltage
V
V = 40 V–60 V, Tested at nominal output volts,
See Figure 1
I
–10%
10%
DCT104803,
DCT104805
Output voltage trim range
V = 32 V–75 V, Tested at nominal output
volts, See Figure 1
I
†
–2%
†
2%
Load regulation
Output current
I
O
= 10% to 100% I
, relative to 50% I
max
±0.5
±1
2
%V
A
max
O
I
O
0.2
DCT104803
DCT104805
6.6
10
Output power
W
Output ripple and noise
I
O
= 100% I
, See Note 1 and Figure 1
50
mV
pp
max
†
Output voltage temperature coefficient
Transient response
Relative to 25°C, See Figure 1
±0.02
%/C
%V
I
= 50 to 75% I
, See Figure 1
5
250
5
O
O
max
max
O
Transient recovery
(Time to within 1% of nominal volts)
I
= 50 to 75% I
, See Figure 1
µs
V
OS
Start-up overshoot
See Figure 1
See Figure 1
%V
S
O
Start-up time
(Time to within 1% of nominal volts)
TBD
DCT104803
DCT104805
76%
80%
I
= 75% I
at nominal output voltage,
O
max
Efficiency
thermal steady state, See Figure 1
See
Note 3
Maximum output short circuit duration
S
V
Remote shutdown on logic low input
voltage
V
T
See Note 2
–0.3
0.8
IL
Logic low pullup current
Operating temperature
Storage temperature
Switching frequency
Tested at V = 0.8 V
IL
–1300
–40
–640
–200
85
µA
°C
–40
125
°C
stg
440
kHz
†
Assured by design.
NOTES: 1. Measurement made using tip and barrel technique, decoupled with a 100-nF ceramic capacitor. Bandwidth of oscilloscope limited
to 20 MHz.
2. Remote shutdown (RSD) pin is active low. See application section for more information.
3. Continuous
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
Package Pin Assignments
PIN
1
SIGNAL
PWMa
0V
PIN
8
SIGNAL
PWMb
PIN
15
16
17
18
19
20
21
SIGNAL
PIN
22
23
24
25
26
27
28
SIGNAL
Not present
Not present
Not present
SNUB2
0V
0V
O
2
9
Not present
BIAS
(dev)
O
3
V
I
10
11
12
13
14
DNC
DNC
4
SNUB1
COMP
5
Not present
Not present
0V
(sense)
V
V
0V
0V
O
(dev)
6
REF
NC
O
I
7
0V
(dev)
DNC
RSD
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
2, 7, 26
0 V
0 V
0 V
0 V
Device 0 V
(dev)
12
15,16
27
Output 0 V
Output 0 V
Input 0 V
(sense)
(sense)
O
I
BIAS
10
Bias voltage. Bias point for internal circuitry.
Compensation. Frequency compensation for control loop shaping.
COMP
DNC
11
17, 18, 21 Do not connect. Pin has internal electrical connection and must be left open circuit.
14 No connection. Pin has no internal electrical connection.
NC
Not present
5, 6, 9, 22, These pins have been removed.
23, 24
PWMa
PWMb
REF
1
8
Pulse width modulator A. Input to pulse width modulator.
Pulse width modulator B. Control loop signal for pulse width modulator.
Reference voltage. Used to provide regulated output voltage. For internal use only.
Remote shutdown. Active low with respect to primary side ground to shutdown the DCT10.
Snubber connection
13
28
4
RSD
SNUB1
SNUB2
25
3
Snubber connection
V
I
Input voltage (positive)
19,20
Output voltage (positive). Regulated output voltage.
V
O
4
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
R1
Input
Volts
3
10
V
BIAS
I
Output
Volts
25
19,20
SNUB2
V
O
C7
220 pF
DCT1048XX
R7 470 R
11
13
R2
47 R
COMP
REF
C1
22 µF
C2
100 nF
4
28
1
V
(sense)
C4
100 nF
SNUB1
RSD
PWMa
Remote
Shutdown
R3
R4
C5
100 nF
C6
470 µF
R5
1 kΩ
C3
100 nF
8
PWMb
0 V
(dev)
0 V
2,7,26
12
R6
0.75 Ω
0 V
(sense)
(sense)
27
15,16
Input 0 V
0 V
0 V
O
Output 0 V
I
Figure 1. Schematic
schematic information
ITEM
REF
DESCRIPTION
GENERAL INFORMATION
1
C1
22 µF, 100 V, ultralow impedance electrolytic capacitor. 105°C. Ripple
current at 100 kHz >80 mA.
2
3
4
5
6
C2
C3
C4
C5
C6
100 nF, 100 V, X7R dielectric
100 nF, 25 V, X7R dielectric
100 nF, 25 V, X7R dielectric
100 nF, 25 V, X7R dielectric
470 µF, 10 V, ultralow impedance electrolytic capacitor. 105°C. Ripple
Capacitor value should not exceed 470 µF
current at 100 kHz > 400 mA
7
8
C7
R1
220 pF, 100 V, X7R, dielectric
5%, power rating > 10 mW
R1 = 100 Ω, DCT104803
R1 = 270 Ω, DCT104805
9
R2
R3
47 R, 5%, power rating ≥ 250 mW
10
R3 = 20 kΩ, DCT104803
R3 = 10 kΩ, DCT104805
Power rating > 10 mW
See application section for more information
11
R4
R4 = 12 kΩ, DCT104803
R4 = 3.3 kΩ, DCT104805
Power rating > 10 mW
See application section for more information
12
13
14
R5
R6
R7
1 kΩ, 5%, power rating >10 mW
0.75 Ω, 5%, power rating ≥ 250 mW
470 R, 5%, power rating > 10 mW
detailed description
The DCT10 switching topology is based on a buck derived, full-bridge converter. The output is sensed and
compared with a secondary side reference and an error signal is fed back via an optocoupler to the PWM
controller.
The converter construction is based on well developed industry standard integrated circuit processes. A copper
leadframe is used for mounting the components. The magnetic devices are glued into position and the
terminations are soldered onto the leadframe using high temperature solder. The silicon dice are mounted onto
the leadframe with silver loaded epoxy and the bond connections are ultrasonically welded onto the leadframe.
The complete assembly is transfer moulded using a silica-filled epoxy material.
5
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
APPLICATION INFORMATION
remote shutdown
The remote shutdown (RSD) allows the converter to be put into a low power dissipation state and is active low.
The RSD input can typically source 640 µA and should be pulled to less than 0.8 V with respect to 0 V . The
I
switch device should be rated to V
≥ 40 V.
(CEO)
RSD
0 V
I
Figure 2. Remote Shutdown Circuit
When using the remote shutdown, start-up load sequencing conditions apply, where the input voltage is greater
than 60 VDC. Under these conditions, the output load should not be greater than 0.25 A. As soon as the output
rail has reached the correct voltage, any specified load can be applied.
output voltage programming
The output voltage is determined by programming R4 (see Figure 1 schematic) according to the following
formula:
3.3-V variant: R4 = 24600/ (V – V ), where V is the value of the reference voltage.
O
ref
ref
R4 cannot be less than 10.25 k or greater than 14 k. For example, for a 3.3-V output, R4 = 12k.
5-V variant: R4 = 12300/(V – V ), where V is the value of the reference voltage.
O
ref
ref
R4 cannot be less than 2.9 k or greater than 3.8 k. For example, for a 5-V output, R4 = 3.3k.
Output set-point can be determined by taking into account the tolerance of R3, R4 and V and applying the
ref
following formula:
R4 ) R3
V
+ V
x
O
ref
R4
6
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
APPLICATION INFORMATION
remote sensing
Full-differentialremotesensingcanbeachievedbyconnectingV
(seeFigure1schematic)and0V
(sense)
(sense)
at the point of load. The maximum terminal voltage should not exceed the defined output voltage trim range
values. Care should be taken when laying out the sense connections to avoid noise pickup. If wire is used for
sense leads, it is recommended that it be formed into a twisted pair. Additional noise suppression can be
provided by adding 0.1-µF ceramic capacitors between each of the output pins and the corresponding sense
connection.
Protection can be added in the event of one of the remote sense leads breaking by inserting 50-Ω resistors
betweenV
andV and0V
and0V . TheseprotectionresistorsshouldbeconnectedlocallytoV
(sense)
O
(sense) O O
and 0 V
O.
Ifremotesensingisnotrequired,V
and0V
shouldbeconnectedlocallytoV and0V respectively.
(sense)
(sense) O O
safety
For safety agency approval of the end-system in which the DCT10408x is used, the unit must be installed in
compliance with the safety and separation requirements of the end-use safety standard: UL 1950, CSA 22.2
and EN 60 950.
The isolation system deployed in the DCT10408x is considered to be basic insulation in accordance with UL
1950, CSA 22.2 and EN 60 950. The following circuits can be connected together:
BETWEEN (INPUT)
AND (OUTPUT)
TNV-2 Circuit
TNV-3 Circuit
Unearthed SELV circuit
Earthed SELV circuit
Earthed or unearthed
Hazardous voltage
Secondary circuit
Earthed SELV circuit
ELV Circuit
Unearthed hazardous voltage
Secondary circuit
In order to maintain basic insulation between the above circuits, special consideration must be given to the
layout of the host application printed-circuit board. It is assumed that the application installation is category II
and the comparative tracking index is IIIa + IIIb.
Creepage/clearance distances must be adhered to between the various pin/tracking connections as shown in
the following table:
Between pins
And pins
10 to 21
Creepage (minimum) Clearance (minimum)
1,3 mm 0,7 mm
1 to 8 and 25–28
To ensure there are no operational issues, the following creepage/clearance distances should be adhered to:
Between pin
And pin
Creepage (minimum) Clearance (minimum)
V (3)
I
0V
(2), PWMa (1), DNC (4)
(26)
1,3 mm
1,2 mm
0,7 mm
0,7 mm
(dev)
(dev)
DNC (21)
0V
The input to the DCT10, should be protected by a 5-A slow-blow fuse.
7
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
APPLICATION INFORMATION
safety (continued)
Overvoltage protection is required to protect downstream circuitry and to ensure the output of the DCT10
complies with SELV limits during fault conditions. In the event of a single point failure of basic insulation or a
component, it is imperative that the voltage appearing across the output rails will not exceed 42.4-V peak, or
60 VDC for longer than 0.2 s. Moreover, a limit of 71-V peak, or 120 VDC will not be exceeded.
It is recommended that a clamp type circuit be applied across the output rails. In the event of a failure, this circuit
detects that an overvoltage condition has occurred and then applies a low-impedance across the output rails
forcing the input fuse to blow. Either a transorb (SMBJ6.0A manufactured by Semtech and General Instrument)
or a crowbar circuit as shown in Figure 3 can be used.
+V
O
D1, 6V2
BZX55c6v2
SCR1
R1
100 Ω,1/8 W
C1
100 nF, 25 Vdc
Ceramic
0 V
O
Figure 3. Protection Circuit
layout considerations
Special care should be taken when laying out the PCB to accommodate the DCT10 module with respect to
safety, EMC, output voltage ripple/noise, and thermal performance.
safety
See the safety section in the Application Information of this document.
thermal
The main thermal path for the extraction of heat is via the pins and the host printed-circuit board. The pins that
carry the heat on the primary side of the device are pins 2 and 26, and the pins that carry the heat on the
secondary side are pins 15 and 16 and 19 and 20.
output voltage ripple/noise
Large ground loops between V and 0 V should be avoided. Filter capacitors should be positioned as close
O
O
as possible to these connections.
8
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
MECHANICAL DATA
DVM (R-PDSO-G22/28)
PLASTIC SMALL-OUTLINE
C
1.565 (39,75)
1.380 (35,05)
28
15
0.580 (14,73)
0.485 (12,32)
C
Index
Area
1
14
0±5°
0.310 (7,87)
0.300 (7,62)
0.625 (15,88)
0.600 (15,24)
0.350 (8,89)
MAX
0.070 (1,78)
0.030 (0,76)
D
Base
Plane
–C–
Seating
Plane
0±5°
0.022 (0,56)
0.014 (0,36)
0.020 (0,51)
MIN
0.057 (1,45)
0.045 (1,15)
0.005 (0,13)
MIN 4 PL
C
0.010 (0,25) M
0.015 (0,38)
0.008 (0,20)
0.730 (18,54)
0.690 (17,53)
C
Full Lead
0.100 (2,54)
4202652/A 08/01
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 (0,25).
D. Maximum dimension does not include dambar protrusions. Dambar protrusions shall not exceed 0.005 (0,13).
E. Lead shoulder dimension for leads 2, 3, 4, 25, 26 less than nominal to maintain specified lead spacing.
F. A visual index feature must be located within the cross-hatched area.
G. For automatic insertion, any raised irregularity on the top surface (step, mesa, etc.) shall be symmetrical about the lateral and
longitudinal package centerlines.
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DCT104803
DCT104805
SLVS407 – OCTOBER 2001
MECHANICAL DATA
NVM (R-PDIP-T22/28)
PLASTIC DUAL-IN-LINE
D
1.565 (39,75)
1.380 (35,05)
28
15
0.580 (14,73)
0.485 (12,32)
D
Index
1
14
Area
0.310 (7,87)
0.300 (7,62)
E
0.625 (15,88)
0.070 (1,78)
0.030 (0,76)
H
0.350 (8,89)
MAX
0.600 (15,24)
C
Base
Plane
–C–
Seating
PLane
E
C
0.200 (5,08)
0.110 (2,79)
0.600 (15,26)
0.022 (0,56)
0.014 (0,36)
0.005 (0,13)
MIN 4 PL
Full Lead
0.015 (0,38)
0.008 (0,20)
D
M
0.010 (0,25)
C
0.060 (1,52)
0.000 (0,00)
F
0.100 (2,54)
0.010 (0,25)
MIN
C
0.700 (17,78)
MAX
F
4202651/A 08/01
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Dimensions are measured with the package seated in JEDEC seating plane gauge GS-3.
D. Dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 (0,25).
E. Dimensions measured with the leads constrained to be perpendicular to Datum C.
F. Dimensions are measured at the lead tips with the leads unconstrained.
G. Pointed or rounded lead tips are preferred to ease insertion.
H. Maximum dimension does not include dambar protrusions. Dambar protrusions shall not exceed 0.005 (0,13).
I. Lead shoulder dimension for leads 2, 3, 4, 25, 26 less than nominal to maintain specified lead spacing.
J. A visual index feature must be located within the cross-hatched area.
K. For automatic insertion, any raised irregularity on the top surface (step, mesa, etc.) shall be symmetrical about the lateral and
longitudinal package centerlines.
10
www.ti.com
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, maskworkright, orotherTIintellectualpropertyrightrelatingtoanycombination, machine, orprocess
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Mailing Address:
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Post Office Box 655303
Dallas, Texas 75265
Copyright 2001, Texas Instruments Incorporated
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Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
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