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부품번호 TEA1795T 기능
기능 GreenChip synchronous rectifier controller
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TEA1795T 데이터시트, 핀배열, 회로
TEA1795T
GreenChip synchronous rectifier controller
Rev. 1 — 4 November 2010
Product data sheet
1. General description
The TEA1795T is a member of the new generation of Synchronous Rectifier (SR)
controller ICs for switched mode power supplies. Its high level of integration enables the
design of a cost-effective power supply with a minimum number of external components.
The TEA1795T is a dedicated controller IC for synchronous rectification on the secondary
side of resonant converters. It has two driver stages for driving the SR MOSFETs, which
are rectifying the outputs of the central tap secondary transformer windings.
The two gate driver stages have their own sensing inputs and operate independently of
each other.
The TEA1795T 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)
„ Separate sense inputs for sensing the drain and source voltage of each SR MOSFET
„ High level of integration, resulting in a minimum external component count
„ High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
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 TEA1795T is intended for resonant power supplies. In such applications, it can drive
two external synchronous rectifier MOSFETs which replace diodes for the rectification of
the voltages on the two secondary windings of the transformer. It can be used in
applications such as:
„ Adapters
„ ATX power supplies




TEA1795T pdf, 반도체, 판매, 대치품
NXP Semiconductors
TEA1795T
GreenChip synchronous rectifier controller
Vin
Qprim1
PRIMARY
SIDE
CONTROLLER
CHB
Qprim2
TR
Vout
RDRNSENSE1
RDRNSENSE2
Qsec1
IC1 VCC
DSA
DSB
GDA TEA1795T GDB
SSA
SSB
Qsec2
Cout
GND
001aal797
Fig 3. TEA1795T: typical configuration
7.2 Start-up and UnderVoltage LockOut (UVLO)
The IC leaves the UVLO state and activates the synchronous rectifier circuitry when the
voltage on the VCC pin is above Vstartup (8.5 V typical). When the voltage drops below
8.0 V (typical), the UVLO state is reentered and the SR MOSFET gate driver outputs are
actively kept low.
7.3 Supply management
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
7.4 Synchronous rectification (DSA, SSA, DSB and SSB pins)
The voltages present between the drain and source terminals of the SR MOSFETs are
used to derive the timing for the gate drive signal. The IC senses the voltage difference
between the drain sense (pins DSA and DSB) and the source sense (pins SSA and SSB)
connections. When this voltage difference is lower than Vact(drv) (220 mV typical), the
corresponding gate driver output voltage is driven high and the external SR MOSFET is
switched on.
When the external SR MOSFET is switched on, the input signals on the drain sense pins
and source sense pins are ignored during the minimum synchronous rectification active
time (tact(sr)(min), 520 ns typical). This minimizes false switch-off due to the sensing of high
frequency ringing signals at the start of the conduction phase.
TEA1795T
Product data sheet
Once this minimum synchronous rectification active time has ended, the IC monitors the
difference between the drain sense inputs and the source sense inputs. When the
difference is higher than Vreg(drv) (25 mV typical), the gate driver output voltage is
regulated to maintain this 25 mV difference between the drain sense pins and the source
sense pins. As a result, the SR MOSFET can be switched off quickly when the current
through the external SR MOSFET reaches zero.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 November 2010
© NXP B.V. 2010. All rights reserved.
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TEA1795T 전자부품, 판매, 대치품
NXP Semiconductors
TEA1795T
GreenChip synchronous rectifier controller
10. Characteristics
Table 5. Characteristics
Tamb = 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.
Symbol Parameter
Conditions
Min Typ Max Unit
Supply voltage management (pin VCC)
Vstartup
start-up voltage
Vhys hysteresis voltage
ICC(oper) operating supply current
VCC = 8 V (VCC < Vstartup)
fsw = 200 kHz;
no load on pins GDA and GDB
8.2
[1] -
-
-
8.5 8.8
0.5 -
0.35 -
1.85 -
V
V
mA
mA
Synchronous rectification sense input (pins DSA/SSA and pins DSB/SSB)
Vact(drv)
Vreg(drv)
Vdeact(drv)
VI(cm)
td(act)(drv)
td(deact)(drv)
tact(sr)(min)
driver activation voltage
Vsense(S)A = 0 V; Vsense(S)B = 0 V
driver regulation voltage
Vsense(S)A = 0 V; Vsense(S)B = 0 V
driver deactivation voltage Vsense(S)A = 0 V; Vsense(S)B = 0 V
common-mode input voltage pins SSA and SSB
[2]
driver activation delay time
driver deactivation delay
time
minimum synchronous
rectification active time
Vsense(S)A = 0 V; Vsense(S)B = 0 V;
Vsense(D)A = falling from +0.5 V to 0.5 V;
Vsense(D)B = falling from +0.5 V to 0.5 V
Vsense(S)A = 0 V; Vsense(S)B = 0 V;
Vsense(D)A = rising from 0.35 V to +0.5 V;
Vsense(D)B = rising from 0.35 V to +0.5 V
260
33
-
0.7
-
220
25
12
-
100
180
17
-
+0.7
-
mV
mV
mV
V
ns
- 35 - ns
415 520 625 ns
toff(sr)(min) minimum synchronous
rectification off-time
310 400 490 ns
Gate driver (pins GDA/GDB)
Isource
source current
VCC = 15 V; pins GDA/GDB = 2 V; during
minimum synchronous rectification active
time
0.46 0.4 0.34 A
VCC = 15 V; pins GDA/GDB = 5 V;
minimum synchronous rectification active
time has ended
- 4 - mA
Isink sink current
VCC = 15 V
pins GDA/GDB = 2 V
1 1.4 - A
pins GDA/GDB = 9.5 V
2.2 2.7 -
A
Vo(max)
maximum output voltage
Switching
VCC = 15 V
- 10 12 V
fsw(max)
maximum switching
frequency
500 -
-
kHz
[1] The VCC stop voltage is Vstartup Vhys.
[2] The Vdeact(drv) level is always above the Vreg(drv) level.
TEA1795T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 November 2010
© NXP B.V. 2010. All rights reserved.
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TEA1795T

GreenChip synchronous rectifier controller

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