TEA1792T/N1 [NXP]
DIODE RECTIFIER DIODE, Rectifier Diode;
| 型号： | TEA1792T/N1 |
| 厂家： | 
NXP |
| 描述： | DIODE RECTIFIER DIODE, Rectifier Diode 二极管 |
| 文件： | 总13页 (文件大小：329K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TEA1792T
GreenChip synchronous rectifier controller
Rev. 2 — 9 July 2012
Product data sheet
1. General description
The TEA1792T is a member of the new generation of Synchronous Rectifier (SR)
controller ICs for switched mode power supplies. Its high level of integration allows the
design of a cost-effective power supply with a very low number of external components.
The TEA1792T is a controller IC dedicated to synchronous rectification on the secondary
side of discontinuous conduction mode and quasi-resonant flyback converters.
The TEA1792T is fabricated in a Silicon-On-Insulator (SOI) process.
2. Features and benefits
2.1 Distinctive features
Accurate synchronous rectification functionality
Wide supply voltage range (8.5 V to 38 V)
High level of integration, resulting in a very low external component count
High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
Selectable regulation level for driver stage
2.2 Green features
Low current consumption
High system efficiency from no load to full load
2.3 Protection features
UnderVoltage Protection (UVP)
3. Applications
The TEA1792T is intended for adapters. The device can also be used in all other
discontinuous conduction mode systems and quasi-resonant flyback systems that
demand a highly efficient and cost-effective solution.
TEA1792T
NXP Semiconductors
GreenChip synchronous rectifier controller
4. Ordering information
Table 1.
Ordering information
Type number
Package
Name
SO8
Description
plastic small outline package; 8 leads; body width 3.9 mm
Version
TEA1792T/N1
SOT96-1
5. Block diagram
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See Table 2 for details on the pinning.
(1) 1.8 s and 2.1 s.
Fig 1. Block diagram
TEA1792T
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Product data sheet
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TEA1792T
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GreenChip synchronous rectifier controller
6. Pinning information
6.1 Pinning
1
2
3
4
8
7
6
5
SRSENSE
GND
V
CC
n.c.
TEA1792T
n.c.
SELREG
n.c.
DRIVER
aaa-000136
Fig 2. Pin configuration
6.2 Pin description
Table 2.
Symbol
SRSENSE
GND
Pin description
Pin
1
Description
synchronous timing input
ground
2
n.c.
3
not connected
DRIVER
n.c
4
driver output for SR MOSFET
not connected
5
SELREG
n.c.
6
selection input for driver regulation level
not connected
7
VCC
8
supply voltage
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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GreenChip synchronous rectifier controller
7. Functional description
7.1 Introduction
The TEA1792T is the controller for synchronous rectification used in discontinuous
conduction mode and quasi-resonant flyback converters.
7.2 Start-up and UnderVoltage LockOut (UVLO)
The IC leaves the undervoltage lockout state and activates the synchronous rectifier
circuitry when the voltage on the VCC pin is above 8.5 V (typical). When the voltage drops
below 8.0 V (typical), the undervoltage lockout state is entered again and the SR driver
output is actively kept low.
7.3 Synchronous rectification
After a negative voltage lower than Vact(drv) (220 mV typical) is sensed on the SRSENSE
pin, the driver output voltage is driven HIGH. Then the external MOSFET is switched on.
When the SRSENSE voltage rises to Vreg(drv) 42 mV/30 mV), the driver output voltage
is regulated to maintain the Vreg(drv) on the SRSENSE pin. When the SRSENSE voltage is
above the Vdeact(drv) level (12 mV typical), the driver output is pulled to ground.
After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked
during the tact(sr)(min) (1.8 s typical). This action eliminates false switch-off due to high
frequency ringing at the start of the secondary stroke.
When the voltage on the SRSENSE pin is Vreg(drv), the driver output voltage is reduced.
This reduction enables the external power switch to be switched off quickly when the
current through the switch reaches zero. The zero current switch-off removes the need for
a separate Standby mode to maintain high efficiency during the no-load operation. The
zero current is detected by sensing a Vdeact(drv) (12 mV typical) level on the SRSENSE
pin (see Figure 3).
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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TEA1792T
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GreenChip synchronous rectifier controller
V
SRSENSE
0 V
V
V
V
(-12 mV typ.)
(-42 mV/-30 mV typ.)
(-220 mV typ.)
deact(drv)
reg(drv)
act(drv)
primary
current
0 A
0 A
0 V
secondary
current
V
DRIVER
aaa-000137
Fig 3. Synchronous rectification signals
The level of the driver regulation voltage Vreg(drv) can be selected using the SELREG pin.
When this SELREG pin is grounded, the typical Vreg(drv) equals 42 mV. When the
SELREG pin is left open, the Vreg(drv) level equals 30 mV.
Internally, the SELREG pin has a pull-up current source of 10 µA. When this pin is short
circuited to ground, the pin selects the lowest Vreg(drv). If the pin is left open, the highest
Vreg(drv) value is selected.
If the secondary stroke of the flyback converter is shorter than tact(sr)(min) short time (1.8 s
typical), the driver output is disabled. This action guarantees stable operation for very low
duty cycles. When the secondary stroke increases above tact(sr)(min), long time (2.1 s
typical), the driver output is again enabled.
7.4 Supply management
All internal reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
7.5 Driver
The driver circuit to the external power MOSFET gate has a typical source capability of
400 mA and a typical sink capability of 2.7 A. These capabilities permit fast switch-on and
switch-off of the power MOSFET for efficient operation. The source stage is coupled to the
timer (see Figure 1). When the timer has finished, the source capability is reduced to a
small current (5 mA typical) capable of keeping the driver output voltage at its level.
TEA1792T
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Product data sheet
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TEA1792T
NXP Semiconductors
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The output voltage of the driver is limited to 10 V (typical). This high output voltage drives
all MOSFET brands to the minimum on-state resistance.
During start-up conditions (VCC < Vstartup) and undervoltage lockout the driver output
voltage is actively pulled low.
8. Limiting values
Table 3.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured
with respect to ground (pin 2); positive currents flow into the chip. The voltage ratings and current
ratings are valid provided the other ratings are not violated.
Symbol
Voltages
VCC
Parameter
Conditions
Min
Max
Unit
supply voltage
continuous
0.4
-
+38
120
+5
V
V
V
VSRSENSE voltage on pin SRSENSE continuous
VSELREG
Currents
IDRIVER
ISRSENSE
General
Ptot
voltage on pin SELREG
continuous
0.4
current on pin DRIVER
current on pin SRSENSE
duty cycle < 10 %
0.8
3
+3
-
A
mA
total power dissipation
storage temperature
junction temperature
Tamb < 80 C
-
0.45
+150
+150
+2
W
Tstg
55
40
2
C
C
kV
Tj
[1]
VESD
electrostatic discharge
voltage
human body model; JEDEC
Class 2; all pins
charged device model;
JEDEC Class 3; all pins
500 +500
V
[1] Equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor.
9. Thermal characteristics
Table 4.
Thermal characteristics
Parameter
Symbol
Conditions
Typ
Unit
Rth(j-a)
thermal resistance from junction JEDEC test board
to ambient
157
K/W
Rth(j-c)
thermal resistance from junction JEDEC test board
to case
90
K/W
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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TEA1792T
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GreenChip synchronous rectifier controller
10. Characteristics
Table 5.
amb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into
the IC; unless otherwise specified.
Characteristics
T
Symbol Parameter
Supply voltage management (pin VCC
Conditions
Min
Typ
Max
Unit
)
Vstartup
Vhys
start-up voltage
8.2
0.35
0.2
0.8
8.5
0.5
0.25
1
8.8
0.65
0.4
V
[1]
hysteresis voltage
V
ICC(oper)
operating supply current
VCC = 8 V (VCC < Vstartup
)
mA
mA
under normal operation; no load on
pin DRIVER
1.2
Synchronous rectification sense input (pin SRSENSE)
Vact(drv)
Vreg(drv)
driver activation voltage
driver regulation voltage
260
55
220
42
180
30
mV
mV
resistance between pins SELREG
and GND < 15 k
resistance between pins SELREG
38
30
22
mV
and GND > 700 k
Vdeact(drv)
td(act)(drv)
driver deactivation voltage
-
12
-
mV
ns
driver activation delay
time
50
75
100
tact(sr)(min)
minimum synchronous
rectification active time
short time
1.3
1.6
12
1.8
2.1
10
2.3
2.6
8
s
s
A
long time
Io(SELREG)
output current on pin
SELREG
VSELREG = 2.5 V
Driver (pin DRIVER)
Isource
source current
VCC = 15 V; voltage on
pin DRIVER = 2 V
during minimum synchronous
rectification time
0.45
6
0.4
5
0.35
4
A
minimum synchronous
mA
rectification time has ended
Isink
sink current
VCC = 15 V
voltage on pin DRIVER = 2 V
voltage on pin DRIVER = 9.5 V
1
1.4
2.7
10
-
A
A
V
2.2
9
-
Vo(max)
maximum output voltage VCC = 15 V
12
[1] The VCC stop voltage is Vstartup Vhys
.
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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GreenChip synchronous rectifier controller
11. Application information
A switched mode power supply with the TEA1792T consists of a primary side
discontinuous conduction mode flyback controller, a transformer and an output stage with
a feedback circuit. A MOSFET (Qsec) is used for low conduction losses in the output state.
The TEA1792T controls this MOSFET.
The timing for the synchronous rectifier switch is derived from the voltage sensed on the
SRSENSE pin. The resistor in the SRSENSE connection protects the TEA1792T from
excessive voltages. The RSRSENSE resistor is typically 1 k. Higher values can impair
correct timing, lower values do not provide sufficient protection.
TR
Q
sec
V
o
V
IN
R
R
SRSENSE
DRIVER
C
VCC
GND SELREG DRIVER
Q
C
out
prim
PRIMARY
SIDE
CONTROLLER
TEA1792
V
CC
SRSENSE
aaa-000138
Fig 4. Application diagram high side rectification
TR
V
o
V
IN
V
CC
R
SRSENSE
SRSENSE
DRIVER
Q
Q
sec
prim
PRIMARY
SIDE
C
out
TEA1792
R
DRIVER
CONTROLLER
SELREG
GND
aaa-000139
Fig 5. Application diagram low side rectification
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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TEA1792T
NXP Semiconductors
GreenChip synchronous rectifier controller
12. Package outline
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
D
E
A
X
v
c
y
H
M
A
E
Z
5
8
Q
A
2
A
(A )
3
A
1
pin 1 index
θ
L
p
L
1
4
e
w
M
detail X
b
p
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
(1)
(1)
(2)
UNIT
A
A
A
b
c
D
E
e
H
L
L
p
Q
v
w
y
Z
θ
1
2
3
p
E
max.
0.25
0.10
1.45
1.25
0.49
0.36
0.25
0.19
5.0
4.8
4.0
3.8
6.2
5.8
1.0
0.4
0.7
0.6
0.7
0.3
mm
1.27
0.05
1.05
0.041
1.75
0.25
0.01
0.25
0.01
0.25
0.1
8o
0o
0.010 0.057
0.004 0.049
0.019 0.0100 0.20
0.014 0.0075 0.19
0.16
0.15
0.244
0.228
0.039 0.028
0.016 0.024
0.028
0.012
inches 0.069
0.01 0.004
Notes
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
JEITA
99-12-27
03-02-18
SOT96-1
076E03
MS-012
Fig 6. Package outline SOT96-1 (SO8)
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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GreenChip synchronous rectifier controller
13. Revision history
Table 6.
Revision history
Document ID
TEA1792T v.2
TEA1792T v.1.1
TEA1792T v.1
Release date
20120709
20120126
20110816
Data sheet status
Product data sheet
Objective data sheet
Objective data sheet
Change notice
Supersedes
TEA1792T v.1.1
TEA1792T v.1
-
-
-
-
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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GreenChip synchronous rectifier controller
14. Legal information
14.1 Data sheet status
Document status[1][2]
Product status[3]
Development
Definition
Objective [short] data sheet
This document contains data from the objective specification for product development.
This document contains data from the preliminary specification.
This document contains the product specification.
Preliminary [short] data sheet Qualification
Product [short] data sheet Production
[1]
[2]
[3]
Please consult the most recently issued document before initiating or completing a design.
The term ‘short data sheet’ is explained in section “Definitions”.
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
Suitability for use — NXP Semiconductors products are not designed,
14.2 Definitions
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconductors products in such equipment or
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Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
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representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
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Product specification — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
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shall an agreement be valid in which the NXP Semiconductors product is
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Product data sheet.
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14.3 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. NXP Semiconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
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products are sold subject to the general terms and conditions of commercial
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applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
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Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
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construed as an offer to sell products that is open for acceptance or the grant,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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TEA1792T
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GreenChip synchronous rectifier controller
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
whenever customer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, damages or failed product claims resulting from customer design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors product is automotive qualified,
the product is not suitable for automotive use. It is neither qualified nor tested
in accordance with automotive testing or application requirements. NXP
Semiconductors accepts no liability for inclusion and/or use of
14.4 Trademarks
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
product for such automotive applications, use and specifications, and (b)
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
GreenChip — is a trademark of NXP B.V.
15. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
TEA1792T
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Product data sheet
Rev. 2 — 9 July 2012
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GreenChip synchronous rectifier controller
16. Contents
1
General description. . . . . . . . . . . . . . . . . . . . . . 1
2
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1
Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1
Protection features . . . . . . . . . . . . . . . . . . . . . . 1
2.1
2.2
2.3
3
4
5
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information. . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
6
6.1
6.2
Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
7
Functional description . . . . . . . . . . . . . . . . . . . 4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Start-up and UnderVoltage LockOut (UVLO) . . 4
Synchronous rectification . . . . . . . . . . . . . . . . . 4
Supply management. . . . . . . . . . . . . . . . . . . . . 5
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1
7.2
7.3
7.4
7.5
8
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal characteristics . . . . . . . . . . . . . . . . . . 6
Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application information. . . . . . . . . . . . . . . . . . . 8
Package outline . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history. . . . . . . . . . . . . . . . . . . . . . . . 10
9
10
11
12
13
14
Legal information. . . . . . . . . . . . . . . . . . . . . . . 11
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 11
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
14.1
14.2
14.3
14.4
15
16
Contact information. . . . . . . . . . . . . . . . . . . . . 12
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2012.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 9 July 2012
Document identifier: TEA1792T
相关型号：
TEA1792T/N1,118
Synchronous rectification controller suitable for both high-side and low-side control SOIC 8-Pin
NXP
TEA1795T/N1,118
Dual synchronous rectification controller suitable for both high-side and low-side control SOIC 8-Pin
NXP
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