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TEA1791T/N1,118

P1-P3P4-P6P7-P9P10-P12
TEA1791T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Product data sheet Rev. 02 — 7 June 2010 4 of 12
NXP Semiconductors
TEA1791T
GreenChip synchronous rectifier controller
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.
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 gate of the external power MOSFET has a typical source
capability of 250 mA and a typical sink capability of 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 (V
CC
<V
startup
) and undervoltage lockout the driver output
voltage is actively pulled low.
Fig 3. Synchronous rectification signals
014aaa057
0 V
−12 mV
−55 mV
−310 mV
0 A
0 A
0 V
V
SRSENSE
V
DRIVER
Primary
current
Secondary
current
TEA1791T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Product data sheet Rev. 02 — 7 June 2010 5 of 12
NXP Semiconductors
TEA1791T
GreenChip synchronous rectifier controller
8. Limiting values
[1] Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
[2] Equivalent to discharging a 200 pF capacitor through a 0.75 μH coil and a 10 Ω series resistor.
9. Thermal characteristics
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 Parameter Conditions Min Max Unit
Voltages
V
CC
supply voltage continuous −0.4 +38 V
V
SRSENSE
voltage on pin SRSENSE continuous - 120 V
Currents
I
DRIVER
current on pin DRIVER duty cycle < 10 % −0.8 +3 A
I
SRSENSE
current on pin SRSENSE −3- mA
General
P
tot
total power dissipation T
amb
<80°C - 0.45 W
T
stg
storage temperature −55 +150 °C
T
j
junction temperature −40 +150 °C
V
ESD
electrostatic discharge
voltage
class 2
human body
model
[1]
- 2000 V
machine model
[2]
-200V
charged device
model
-500V
Table 4. Thermal characteristics
Symbol Parameter Conditions Typ Unit
R
th(j-a)
thermal resistance from junction
to ambient
in free air 150 K/W
R
th(j-c)
thermal resistance from junction
to case
95 K/W
TEA1791T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Product data sheet Rev. 02 — 7 June 2010 6 of 12
NXP Semiconductors
TEA1791T
GreenChip synchronous rectifier controller
10. Characteristics
[1] The V
CC
stop voltage is V
startup
− V
hys
.
Table 5. Characteristics
T
amb
=25
°
C; V
CC
= 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 V
CC
)
V
startup
start-up voltage 8.2 8.5 8.8 V
V
hys
hysteresis voltage
[1]
-0.5-V
I
CC(oper)
operating supply current V
CC
=8V (V
CC
<V
startup
) - 0.65 - mA
under normal operation;
no load on pin DRIVER
-0.95-mA
Synchronous rectification sense input (pin SRSENSE)
V
act(drv)
driver activation voltage −340 −310 −280 mV
V
reg(drv)
driver regulation voltage −65 −55 −45 mV
V
deact(drv)
driver deactivation
voltage
- −12 - mV
t
d(act)(drv)
driver activation delay
time
-125-ns
t
act(sr)(min)
minimum synchronous
rectification
Short time 1.5 2.0 2.5 μs
Long time 1.7 2.2 2.7 μs
Driver (pin DRIVER)
I
source
source current V
CC
=15V;
voltage on pin DRIVER = 2 V
−0.3 −0.25 −0.2 A
I
sink
sink current V
CC
=15V
voltage on pin DRIVER = 2 V 1 1.4 - A
voltage on pin
DRIVER = 9.5 V
2.2 2.7 - A
V
o(max)
maximum output voltage V
CC
=15V - 10 12 V
P1-P3P4-P6P7-P9P10-P12

TEA1791T/N1,118

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NXP Semiconductors
Description:
Power Factor Correction - PFC GreenChip SR
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