Datasheet
TEA1892TS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 9 April 2014 7 of 13
NXP Semiconductors
TEA1892TS
GreenChip synchronous rectifier controller
[1] The V
CC
stop voltage is V
startup
V
hys
.
11. Application information
A switched mode power supply with the TEA1892TS consists of a primary side
discontinuous conduction mode flyback controller, a transformer and an output stage with
a feedback circuit. A MOSFET (Q
sec
) is used for low conduction losses in the output state.
The TEA1892TS 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 TEA1892TS from
excessive voltages. The R
SRSENSE
resistor is typically 1 k. Higher values can impair
correct timing, lower values do not provide sufficient protection.
I
CC(oper)
operating supply current V
CC
=8V (V
CC
<V
startup
) 0.2 0.25 0.4 mA
under normal operation; no-load
on pin DRIVER
0.8 1 1.2 mA
Synchronous rectification sense input (pin SRSENSE)
V
act(drv)
driver activation voltage 260 220 180 mV
V
reg(drv)
driver regulation voltage resistance between pins SELREG
and GND < 15 k
55 42 30 mV
resistance between pins SELREG
and GND > 700 k
38 30 22 mV
V
deact(drv)
driver deactivation voltage - 12 - mV
t
d(act)(drv)
driver activation delay time 50 75 100 ns
t
act(sr)(min)
minimum synchronous
rectification active time
1.25 1.5 1.75 s
I
o(SELREG)
output current on pin
SELREG
V
SELREG
= 2.5 V 12 10 8 A
Driver (pin DRIVER)
I
source
source current V
CC
= 15 V; voltage on pin
DRIVER = 2 V
during minimum synchronous
rectification time
0.45 0.4 0.35 A
minimum synchronous
rectification time has ended
6 5 4mA
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 9 10 12 V
f
sw(max)
maximum switching
frequency
250 - - kHz
Table 5. Characteristics …continued
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