IC Phoenix
 
Home ›  TT30 > TEA1762T,Synchronous rectification controller with integrated feedback and protection
TEA1762T Fast Delivery,Good Price
Part Number:
If you need More Quantity or Better Price,Welcom Any inquiry.
We available via phone +865332716050 Email
Partno Mfg Dc Qty AvailableDescript
TEA1762TPHILIPSN/a622avaiSynchronous rectification controller with integrated feedback and protection
TEA1762TNXPN/a1548avaiSynchronous rectification controller with integrated feedback and protection


TEA1762T ,Synchronous rectification controller with integrated feedback and protectionblock diagramTEA1762T_2 NXP B.V. 2007. All rights reserved.Product data sheet Rev. 02 — 25 April 2 ..
TEA1762T ,Synchronous rectification controller with integrated feedback and protectionGeneral descriptionThe TEA1762T is a member of the new generation of Synchronous Rectifier (SR)contr ..
TEA1791T ,Synchronous rectification controller suitable for both high-side and low-side controlGeneral descriptionThe TEA1791T is a member of the new generation of Synchronous Rectifier (SR) con ..
TEA1795T ,GreenChip synchronous rectifier controllerGeneral descriptionThe TEA1795T is a member of the new generation of Synchronous Rectifier (SR) con ..
TEA2000 ,13.2V; PAL/NTSC color encoder
TEA2014 , VIDEO SWITCHING CIRCUIT FOR TV
TL1591CPS , 192- × 165-pixel ccd image sensor
TL1593CNS , 780- × 488-pixel ccd image sensor
TL16C2550IPFB ,2.5-V to 5-V DUAL UART WITH 16-BYTE FIFOS SLWS161E –JUNE 2005–REVISED NOVEMBER 20121.8-V to 5-V DUAL UART WITH 16-BYTE FIFOSCheck for Sample ..
TL16C2550IPFBR ,2.5-V to 5-V DUAL UART WITH 16-BYTE FIFOSFEATURES• Programmable Auto-RTS and Auto-CTS – Baud Generation (DC to 1 Mbit/s)• In Auto-CTS Mode, ..
TL16C2550PFB ,2.5-V to 5-V DUAL UART WITH 16-BYTE FIFOS SLWS161E –JUNE 2005–REVISED NOVEMBER 2012FN PACKAGE(TOP VIEW)6 5 4 3 2 1 44 43 42 41 40D5 39 RESET ..
TL16C2550PFBR ,2.5-V to 5-V DUAL UART WITH 16-BYTE FIFOSTL16C2550


TEA1762T
Synchronous rectification controller with integrated feedback and protection
General descriptionThe 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 TEA1762Tisa controllerIC dedicatedfor synchronous rectificationon 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. Features
2.1 Distinctive features
Combined synchronous rectification and primary feedback control functionality Wide supply voltage range (8.6 V to38V) High level of integration, resulting in a very low external component count Wide opto output voltage range (3.5 V to 38V) 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
Low current consumption High system efficiency from no load to full load
2.3 Protection features
Undervoltage protection Internal over-temperature protection General purpose protection input pin
TEA1762T
GreenChip synchronous rectifier controller
Rev. 02 — 25 April 2007 Product data sheet
NXP Semiconductors TEA1762T
GreenChip synchronous rectifier controller Applications
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. Ordering information Block diagram
Table 1. Ordering information

TEA1762T SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
NXP Semiconductors TEA1762T
GreenChip synchronous rectifier controller Pinning information
6.1 Pinning
6.2 Pin description 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 MOSFET, the TEA1762T contains the voltage reference and amplifiersto regulate and
control the output voltage and output current of the power supply.
Table 2. Pin description for SO14

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
NXP Semiconductors TEA1762T
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 circuitryas soonas the voltageon 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 stateis re-entered and the SR driver outputis 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 voltageis reducedas soonas the voltageon the SRSENSE pin −55 mV, the external power switch canbe switchedoff fast when the current through the
switch reaches zero. With this zero-current switch off, no separate standby mode is
neededto maintain high efficiency during no-load operation. The zero currentis detected
by sensing a −12 mV level on the SRSENSE pin. See Figure3.
If the secondary stroke of the flyback converter is shorter than 2 μs (typical), the driver
outputis disabled. This will guarantee stable operationfor very low duty cycles. When the
secondary stroke increases above 2.2 μs (typical), the driver output is again enabled.
NXP Semiconductors TEA1762T
GreenChip synchronous rectifier controller
7.3 SMPS output voltage and current regulation

The output voltageof the flyback Switched Mode Power Supply (SMPS) canbe 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 outputis intendedto drivean opto coupler (see Figure 5). The opto outputs have open drain output configuration. The maximum sink currentis internally limitedto5 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
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 canbe provided, e.g. the external power
switches and transformer canbe protected against high temperatures. Witha 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 will maximize the currentof pin OPTOPROTas soonas the internal temperature limitis
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.
NXP Semiconductors TEA1762T
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 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. 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 (pin2); positive currents flow intothe chip. The voltage ratings are valid provided other ratings are not violated; current
ratings are valid provided the maximum power rating is not violated.
Voltages

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
VSENSEGND voltage on pin SENSEGND [1] −0.4 +0.4 V
Currents

IOPTOREG current on pin OPTOREG - +6 mA
IOPTOPROT current on pin OPTOPROT - +6 mA
IDRIVER current on pin DRIVER duty cycle<10% −0.8 +3 A
IVREF current on pin VREF −2- mA
ISRSENSE current on pin SRSENSE −3- mA
General

Ptot total power dissipation Tamb <80°C - 0.65 W
Tstg storage temperature −55 +150 °C junction temperature −20 +150 °C
NXP Semiconductors TEA1762T
GreenChip synchronous rectifier controller

[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. Thermal characteristics
The graphin Figure4 shows the relationship between junction temperature and VSENSE
voltage.
ESD

VESD electrostatic discharge voltage class2
human body model [2] - 2000 V
machine model [3] - 200 V
charged device model - 500 V
Table 3. Limiting values …continued

In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to power
ground (pin2); positive currents flow intothe chip. The voltage ratings are valid provided other ratings are not violated; current
ratings are valid provided the maximum power rating is not violated.
Table 4. Thermal characteristics

Rth(j-a) thermal resistance from
junction to ambient
in free air 100 K/W
NXP Semiconductors TEA1762T
GreenChip synchronous rectifier controller
10. Characteristics
Table 5. Characteristics

Tamb =25 °C; VCC=20V;all voltages are measured with respectto sense ground (pin3); currents are positive when flowing
into the IC; unless otherwise specified.
Supply voltage management (pin VCC)

Vstartup start-up voltage 8.35 8.6 8.85 V
Vhys hysteresis voltage [1]- 0.5 - V
ICC(oper) operating supply current VCC =8V; VCC under normal operation; load on pin DRIVER 1.4 - mA
Synchronous rectification sense input (pin SRSENSE)

Vact(drv) driver activation voltage w.r.t. power ground −340 −310 −280 mV
Vreg(drv) driver regulation voltage w.r.t. power ground −65 −55 −45 mV
Vdeact(drv) driver deactivation voltage w.r.t. power ground −12 mV
td(act)(drv) driver activation delay time 125 ns
tact(sr)(min) minimum synchronous rectification
active time
Short time 1.5 2 2.5 μs
Long time 1.7 2.2 2.7 μs
Driver (pin DRIVER)

Isource source current VCC=15 V; voltage on pin
DRIVER=2V
−0.3 −0.25 −0.2 A
Isink sink current VCC =15V
voltage on pin DRIVER=2V 1 1.4 - A
voltage on pin DRIVER= 9.5V 2.2 2.7 - A
Vo(max) maximum output voltage VCC =15V - 10 12 V
Opto output (pin OPTOREG and OPTOPROT)

IO(max) maximum output current VOPTO>5V 456mA
VO(min) minimum output voltage IOPTO = 4 mA 3.5 V
Voltage sense (pin VSENSE)

Vreg(VSENSE) regulation voltage on pin VSENSE See Figure4 2.475 2.5 2.525 V
II(VSENSE) input current on pin VSENSE VVSENSE =Vreg(VSENSE) −100 0 +100 nA transconductance VVSENSE to IOPTOREG 40 A/V gain bandwidth product RL =1kΩ 1 MHz
Reference voltage (pin VREF)

VVREF voltage on pin VREF 2.465 2.5 2.535 V
IVREF current on pin VREF −1mA
CVREF(max) maximum capacitance on pin
VREF pF
Current sense (pin ISENSE)

Vreg(ISENSE) regulation voltage on pin ISENSE w.r.t. power ground;
VPOWERGND> −0.4V 50 54 mV
II(reg)(ISENSE) regulation input current on pin
ISENSE
VISENSE =Vreg(ISENSE) −200 −100 0 nA transconductance VISENSE to IOPTOPROT 8 A/V
ic,good price


TEL:86-533-2716050      FAX:86-533-2716790
   

©2020 IC PHOENIX CO.,LIMITED