Data Sheet

TEA1762T
GreenChip synchronous rectifier controller
Rev. 02 — 25 April 2007
Product data sheet
1. General description
The TEA1762T 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 TEA1762T is a controller IC dedicated for synchronous rectification on the secondary
side of discontinuous conduction mode and quasi resonant flyback converters. Besides
electronics for synchronous rectification, it also has integrated circuitry for output voltage
and output current regulation.
The TEA1762T is fabricated in a Silicon On Insulator (SOI) process. This NXP SOI
process makes possible a wide range of operation.
2. Features
2.1 Distinctive features
n
n
n
n
n
n
n
n
Combined synchronous rectification and primary feedback control functionality
Wide supply voltage range (8.6 V to 38 V)
High level of integration, resulting in a very low external component count
Wide opto output voltage range (3.5 V to 38 V)
Accurate internal voltage reference for voltage control (within 1 %)
Separate sense ground for accurate voltage sensing
High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
Reference voltage output pin
2.2 Green features
n Low current consumption
n High system efficiency from no load to full load
2.3 Protection features
n Undervoltage protection
n Internal over-temperature protection
n General purpose protection input pin
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
3. Applications
n The TEA1762T is intended for adapters. The device can also be used in all other
discontinuous conduction mode and quasi resonant flyback systems that demand a
highly efficient and cost-effective solution.
4. Ordering information
Table 1.
Ordering information
Type number
TEA1762T
Package
Name
Description
Version
SO14
plastic small outline package; 14 leads; body width 3.9 mm
SOT108-1
5. Block diagram
VCC
14
OPTOREG
10
8
9
VSENSE
VREF
2.5 V
11
OPTOPROT
50 mV
7
4
PROTECT
1.25 V
OVER
TEMPERATURE
PROTECTION
SRSENSE
ISENSE
1
control
Q R
DRIVER
TIMER
2 µs
6
Q S
2.2 µs
5, 12, 13
n.c.
−310 mV
2
POWERGND
−12 mV
−55 mV
3
SENSEGND
014aaa059
Fig 1. TEA1762T block diagram
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
2 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
6. Pinning information
6.1 Pinning
SRSENSE
1
14 VCC
POWERGND
2
13 n.c.
SENSEGND
3
12 n.c.
PROTECT
4
n.c.
5
DRIVER
6
OPTOPROT
7
TEA1762T
11 ISENSE
10 VSENSE
9
VREF
8
OPTOREG
001aae773
Fig 2. Pin configuration TEA1762T
6.2 Pin description
Table 2.
Pin description for SO14
Symbol
Pin
Description
SRSENSE
1
synchronous timing input
POWERGND
2
power ground
SENSEGND
3
sense ground
PROTECT
4
general purpose protection input
n.c.
5
not connected
DRIVER
6
driver output for SR MOSFET
OPTOPROT
7
opto coupler driver output for current protection
OPTOREG
8
opto coupler driver output for voltage regulation
VREF
9
reference voltage output
VSENSE
10
sense input for voltage control
ISENSE
11
sense input for current control
n.c.
12
not connected
n.c.
13
not connected
VCC
14
supply voltage
7. Functional description
The TEA1762T is the controller for synchronous rectification to be used in discontinuous
conduction mode and quasi resonant flyback converters. Besides controlling the
SR MOSFET, the TEA1762T contains the voltage reference and amplifiers to regulate and
control the output voltage and output current of the power supply.
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
3 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
7.1 Start-up and undervoltage lock-out
The IC leaves the under-voltage lock-out state and activates the synchronous rectifier
circuitry and also the voltage/current sense circuitry as soon as the voltage on the VCC pin
is above 8.6 V (typical). As soon as the voltage drops below 8.1 V (typical), the
under-voltage lock-out state is re-entered and the SR driver output is actively kept low and
also the opto driver outputs are disabled.
7.2 Synchronous rectification
After a negative voltage (−310 mV typical) is sensed on the SRSENSE pin, the driver
output voltage is made high and the external MOSFET is switched on. As soon as the
SRSENSE voltage rises to −55 mV, the driver output voltage is regulated to maintain the
−55 mV on the SRSENSE pin. As soon as the SRSENSE voltage is above −12 mV, the
driver output is pulled to ground. After switch-on of the SR MOSFET, the input signal on
the SRSENSE pin is blanked for 2 µs (typical). This will eliminate false switch-off due to
high frequency ringing at the start of the secondary stroke.
Because the driver output voltage is reduced as soon as the voltage on the SRSENSE pin
is −55 mV, the external power switch can be switched off fast when the current through the
switch reaches zero. With this zero-current switch off, no separate standby mode is
needed to maintain high efficiency during no-load operation. The zero current is detected
by sensing a −12 mV level on the SRSENSE pin. See Figure 3.
VSRSENSE
0V
−12 mV
−55 mV
−310 mV
Primary
current
0A
Secondary
current
0A
VDRIVER
0V
014aaa057
Fig 3. Synchronous rectification
If the secondary stroke of the flyback converter is shorter than 2 µs (typical), the driver
output is disabled. This will guarantee stable operation for very low duty cycles. When the
secondary stroke increases above 2.2 µs (typical), the driver output is again enabled.
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
4 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
7.3 SMPS output voltage and current regulation
The output voltage of the flyback Switched Mode Power Supply (SMPS) can be controlled
by sensing the output voltage via the VSENSE pin. The feedback loop via the primary
controller can regulate the output voltage of the switched mode power supply by
regulating the voltage on the VSENSE pin to 2.5 V above the voltage on pin SENSEGND.
Also the output current of the flyback SMPS can be controlled or limited. The voltage on
the ISENSE pin is regulated or limited to 50 mV above the voltage on pin POWERGND.
7.4 Opto outputs
The opto output is intended to drive an opto coupler (see Figure 5). The opto outputs have
an open drain output configuration. The maximum sink current is internally limited to 5 mA
(typical). The outputs are linearly controlled via the VSENSE and ISENSE input pins. An
over-temperature situation will switch the protection opto output (OPTOPROT) to its
maximum sink current.
During start-up (VCC < Vstartup) and undervoltage lock-out the outputs are disabled.
7.5 Protection input
The PROTECT pin is a general purpose input pin which can be used for additional
protection of the switched mode power supply. With a Negative Temperature Coefficient
(NTC) thermistor external temperature protection can be provided, e.g. the external power
switches and transformer can be protected against high temperatures. With a Zener diode
a secondary overvoltage protection can be made.
7.6 Reference voltage output
The reference voltage output pin can be used for supplying external circuitry. The
maximum output current must be limited to 1 mA.
The reference voltage is activated as soon as the start-up voltage is reached on the VCC
pin and switched off again after the VCC pin voltage drops below the VCC stop level.
7.7 Supply management
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit. The reference voltage is trimmed to an accuracy within 1 %.
7.8 OverTemperature Protection (OTP)
The IC provides an accurate internal overtemperature protection of 150 °C (typical). The
IC will maximize the current of pin OPTOPROT as soon as the internal temperature limit is
reached. The opto signal can be used on the primary side of the flyback controller to
activate the SMPS protection or limit the output power. As soon as the overtemperature
condition is solved, normal operation will resume.
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
5 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
7.9 Driver
The driver circuit to the gate of the external power MOSFET has a source capability of
typically 250 mA and a sink capability of typically 2.7 A. This permits fast turn-on and
turn-off of the power MOSFET for efficient operation. The output voltage of the driver is
limited to 10 V (typical). This high output voltage will drive all MOSFET brands to the
minimum on-state resistance.
During start-up conditions (VCC < Vstartup) and undervoltage lock-out the driver output
voltage is actively pulled low.
7.10 Power ground and sense ground
The TEA1762T has two ground connections. The sense ground ensures an increased
accuracy of the output voltage of the switched mode power supply and can also be used
to compensate for cable losses on the output of the converter. The grounds are internally
connected via two anti-parallel diodes.
8. Limiting values
Table 3.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to power
ground (pin 2); positive currents flow into the chip. The voltage ratings are valid provided other ratings are not violated; current
ratings are valid provided the maximum power rating is not violated.
Symbol
Parameter
Conditions
Min
Max
Unit
VCC
supply voltage
continuous
−0.4
+38
V
VOPTOREG
voltage on pin OPTOREG
continuous
−0.4
+38
V
VOPTOPROT
voltage on pin OPTOPROT
continuous
−0.4
+38
V
VSRSENSE
voltage on pin SRSENSE
continuous
-
+120
V
VVSENSE
voltage on pin VSENSE
continuous
−0.4
+5
V
VISENSE
voltage on pin ISENSE
−0.4
+5
V
VPROTECT
voltage on pin PROTECT
−0.4
+5
V
−0.4
+0.4
V
Voltages
VSENSEGND
[1]
voltage on pin SENSEGND
Currents
IOPTOREG
current on pin OPTOREG
-
+6
mA
IOPTOPROT
current on pin OPTOPROT
-
+6
mA
IDRIVER
current on pin DRIVER
−0.8
+3
A
IVREF
current on pin VREF
−2
-
mA
ISRSENSE
current on pin SRSENSE
−3
-
mA
-
0.65
W
duty cycle < 10 %
General
Tamb < 80 °C
Ptot
total power dissipation
Tstg
storage temperature
−55
+150
°C
Tj
junction temperature
−20
+150
°C
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
6 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
Table 3.
Limiting values …continued
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to power
ground (pin 2); positive currents flow into the chip. The voltage ratings are valid provided other ratings are not violated; current
ratings are valid provided the maximum power rating is not violated.
Symbol
Parameter
Conditions
electrostatic discharge voltage
class 2
Min
Max
Unit
ESD
VESD
human body model
[2]
-
2000
V
machine model
[3]
-
200
V
-
500
V
charged device model
[1]
Voltages on pin SENSEGND less than +1.0 V will not damage the IC when the duration is limited to 100 µs, but voltages on pin
SENSEGND larger than +0.4 V may lead to disturbed IC operation.
[2]
Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
[3]
Equivalent to discharging a 200 pF capacitor through a 0.75 µH coil and a 10 Ω resistor.
9. Thermal characteristics
Table 4.
Thermal characteristics
Symbol
Parameter
Conditions
Typ
Unit
Rth(j-a)
thermal resistance from
junction to ambient
in free air
100
K/W
The graph in Figure 4 shows the relationship between junction temperature and VSENSE
voltage.
001aae779
2600
regulated
VSENSE
voltage
(mV)
2520
2480
2440
2400
−50
0
50
100
150
junction temperature (°C)
Fig 4. Typical regulated VSENSE voltage versus junction temperature
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
7 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
10. Characteristics
Table 5.
Characteristics
Tamb = 25 °C; VCC = 20 V; all voltages are measured with respect to sense ground (pin 3); currents are positive when flowing
into the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
8.35
8.6
8.85
V
-
0.5
-
V
VCC = 8 V; VCC < Vstartup
-
1
-
mA
under normal operation;
no load on pin DRIVER
-
1.4
-
mA
mV
Supply voltage management (pin VCC)
Vstartup
start-up voltage
Vhys
hysteresis voltage
ICC(oper)
operating supply current
[1]
Synchronous rectification sense input (pin SRSENSE)
Vact(drv)
driver activation voltage
w.r.t. power ground
−340
−310
−280
Vreg(drv)
driver regulation voltage
w.r.t. power ground
−65
−55
−45
Vdeact(drv)
driver deactivation voltage
w.r.t. power ground
td(act)(drv)
driver activation delay time
tact(sr)(min)
minimum synchronous rectification Short time
active time
Long time
mV
−12
mV
125
ns
1.5
2
2.5
µs
1.7
2.2
2.7
µs
−0.3
−0.25
−0.2
A
voltage on pin DRIVER = 2 V
1
1.4
-
A
voltage on pin DRIVER = 9.5 V
2.2
2.7
-
A
VCC = 15 V
-
10
12
V
4
5
6
mA
3.5
V
Driver (pin DRIVER)
Isource
source current
VCC = 15 V; voltage on pin
DRIVER = 2 V
Isink
sink current
VCC = 15 V
Vo(max)
maximum output voltage
Opto output (pin OPTOREG and OPTOPROT)
IO(max)
maximum output current
VOPTO > 5 V
VO(min)
minimum output voltage
IOPTO = 4 mA
Voltage sense (pin VSENSE)
Vreg(VSENSE) regulation voltage on pin VSENSE See Figure 4
II(VSENSE)
input current on pin VSENSE
VVSENSE = Vreg(VSENSE)
gm
transconductance
VVSENSE to IOPTOREG
GB
gain bandwidth product
RL = 1 kΩ
2.475
2.5
2.525
V
−100
0
+100
nA
40
A/V
1
MHz
Reference voltage (pin VREF)
VVREF
voltage on pin VREF
2.465
IVREF
current on pin VREF
−1
CVREF(max)
maximum capacitance on pin
VREF
2.5
2.535
V
mA
40
pF
Current sense (pin ISENSE)
Vreg(ISENSE)
regulation voltage on pin ISENSE
II(reg)(ISENSE) regulation input current on pin
ISENSE
gm
transconductance
w.r.t. power ground;
VPOWERGND > −0.4 V
46
50
54
mV
VISENSE = Vreg(ISENSE)
−200
−100
0
nA
VISENSE to IOPTOPROT
TEA1762T_2
Product data sheet
8
A/V
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
8 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
Table 5.
Characteristics …continued
Tamb = 25 °C; VCC = 20 V; all voltages are measured with respect to sense ground (pin 3); currents are positive when flowing
into the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min
GB
gain bandwidth product
RL = 1 kΩ
1
Typ
Max
Unit
MHz
Protection input (pin PROTECT)
Vth(PROTECT) threshold voltage on pin
PROTECT
Vhys
hysteresis voltage
II(PROTECT)
input current on pin PROTECT
VPROTECT = Vth(PROTECT)
1.15
1.25
1.35
V
15
30
45
mV
−100
−50
−5
nA
Temperature protection
Tpl(max)
maximum protection level
temperature
140
150
-
°C
Tpl(hys)
protection level hysteresis
temperature
-
12
-
°C
[1]
The VCC stop voltage is Vstartup − Vhys.
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
9 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
11. Application information
A switched mode power supply with the TEA1762T consists of a primary side
discontinuous conduction mode flyback controller, a transformer, and an output stage with
a feedback circuit. In the output stage a MOSFET (Qsec) is used for low conduction
losses. The MOSFET is controlled by the TEA1762T. The output voltage and/or current is
also controlled by the TEA1762T via the opto coupler connection to the primary side. See
Figure 5.
The output voltage is set by resistors Rfb1 and Rfb2. The output current is controlled by the
resistor Risense. The timing for the synchronous rectifier switch is derived from the voltage
sensed on the SRSENSE pin. The resistor in the SRSENSE connection is needed to
protect the TEA1762T from excessive voltages. The SRSENSE resistor should typically
be 1 kΩ. Higher values might impair correct timing, lower values may not provide sufficient
protection.
During output short circuit or load connection, the limiting values on pin SENSEGND must
not be exceeded.
Vout
Ropto
Rfb1
OPTO1
Cfb
OPTO2
TR
Vin
OPTOREG
VCC
VREF
OPTOPROT
Cout
−t
Rsrsense
PRIMARY
SIDE
CONTROLLER
Qprim
SRSENSE
TEA1762T
Qsec
PROTECT
VSENSE
DRIVER
Rfb2
POWERGND
ISENSE
SENSEGND
Risense
014aaa058
Fig 5. Application example TEA1762T
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
10 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
12. Test information
12.1 Quality information
The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
11 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
13. Package outline
SO14: plastic small outline package; 14 leads; body width 3.9 mm
SOT108-1
D
E
A
X
c
y
HE
v M A
Z
8
14
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
1
L
7
e
detail X
w M
bp
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
HE
L
Lp
Q
v
w
y
Z (1)
mm
1.75
0.25
0.10
1.45
1.25
0.25
0.49
0.36
0.25
0.19
8.75
8.55
4.0
3.8
1.27
6.2
5.8
1.05
1.0
0.4
0.7
0.6
0.25
0.25
0.1
0.7
0.3
0.01
0.019 0.0100 0.35
0.014 0.0075 0.34
0.16
0.15
0.010 0.057
inches 0.069
0.004 0.049
0.05
0.244
0.039
0.041
0.228
0.016
0.028
0.024
0.01
0.01
0.028
0.004
0.012
θ
o
8
o
0
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT108-1
076E06
MS-012
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-19
Fig 6. Package outline SOT108-1 (SO14)
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
12 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
14. Revision history
Table 6.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
TEA1762T_2
20070425
Product data sheet
-
TEA1762T_1
Modifications:
TEA1762T_1
•
•
Updated limiting values for ISRSENSE in Table 3.
•
•
Soldering section removed.
•
Legal texts have been adapted to the new company name where appropriate.
Updated characteristic values for Isource, Isink, GB (voltage and current sense) and Tpl(max) in
Table 5.
The format of this data sheet has been redesigned to comply with the new identity guidelines
of NXP Semiconductors.
20060331
Objective data sheet
TEA1762T_2
Product data sheet
-
-
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
13 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
15. Legal information
15.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
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.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
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.
15.3 Disclaimers
General — 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.
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
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of a NXP Semiconductors product can reasonably be expected to
result in personal injury, death or severe property or environmental damage.
NXP Semiconductors accepts no liability for inclusion and/or use of NXP
Semiconductors products in such equipment or applications and therefore
such inclusion and/or use is at the customer’s own risk.
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.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
No offer to sell or license — Nothing in this document may be interpreted
or 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.
15.4 Trademarks
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.
16. Contact information
For additional information, please visit: http://www.nxp.com
For sales office addresses, send an email to: [email protected]
TEA1762T_2
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 02 — 25 April 2007
14 of 15
TEA1762T
NXP Semiconductors
GreenChip synchronous rectifier controller
17. Contents
1
2
2.1
2.2
2.3
3
4
5
6
6.1
6.2
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
8
9
10
11
12
12.1
13
14
15
15.1
15.2
15.3
15.4
16
17
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1
Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1
Protection features . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pinning information . . . . . . . . . . . . . . . . . . . . . . 3
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional description . . . . . . . . . . . . . . . . . . . 3
Start-up and undervoltage lock-out . . . . . . . . . 4
Synchronous rectification . . . . . . . . . . . . . . . . . 4
SMPS output voltage and current regulation . . 5
Opto outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Protection input. . . . . . . . . . . . . . . . . . . . . . . . . 5
Reference voltage output . . . . . . . . . . . . . . . . . 5
Supply management. . . . . . . . . . . . . . . . . . . . . 5
OverTemperature Protection (OTP) . . . . . . . . . 5
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power ground and sense ground . . . . . . . . . . . 6
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal characteristics. . . . . . . . . . . . . . . . . . . 7
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Application information. . . . . . . . . . . . . . . . . . 10
Test information . . . . . . . . . . . . . . . . . . . . . . . . 11
Quality information . . . . . . . . . . . . . . . . . . . . . 11
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 12
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 13
Legal information. . . . . . . . . . . . . . . . . . . . . . . 14
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 14
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Contact information. . . . . . . . . . . . . . . . . . . . . 14
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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. 2007.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 25 April 2007
Document identifier: TEA1762T_2
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