參數(shù)資料
型號(hào)： TEA1541
廠商： NXP Semiconductors N.V.
英文描述： SMPS control IC with synchronization function
中文描述： 開關(guān)電源與同步功能控制IC
文件頁(yè)數(shù)： 10/19頁(yè)
文件大?。?/td> 112K
代理商： TEA1541
2003 Aug 11
10
Philips Semiconductors
Product specification
SMPS control IC with
synchronization function
TEA1541
where V
sense(max)
is the maximum source voltage for OCP.
I
SS
flows when the voltage on pin I
sense
is less than
approximately 0.5 V. If this voltage exceeds 0.5 V, the
soft-start current source starts to limit I
SS
and completely
switches I
SS
off at V
CC(start)
.
Note that I
SS
is derived from the internal current source
supplying charging current to pin V
CC
. During soft-start,
the charging current to pin V
CC
will be reduced by up to
60
μ
A depending on the value of R
SS
.
6.10
Winding short-circuit protection
Thewindingshort-circuitprotectioncircuitisactivatedafter
the leading edge blanking period. A short-circuit in the
transformer winding is detected when the voltage at
pin I
sense
exceeds the winding short-circuit protection
voltage V
swp
. When a short-circuit is detected, the flyback
converter supply will stop switching. When the voltage at
pin V
CC
falls below V
CC(UVLO)
, the IC enters safe restart
mode, and capacitor C
VCC
will recharge via the internal
start-up current source supplied from pin VIN until the
flyback converter supply restarts at V
CC(start)
. The fault
detection and restart cycle will be repeated until the
short-circuit is removed. The winding short-circuit
protection circuit also provides protection if a diode in the
transformer secondary circuit goes short-circuit.
6.11
Overtemperature protection
An accurate temperature protection circuit stops the
converter from switching if the IC junction temperature
exceeds the maximum temperature protection level
T
prot(max)
. When the voltage at pin V
CC
falls below
V
CC(UVLO)
, the IC enters safe restart mode, and capacitor
C
VCC
will recharge to V
CC(start)
via the internal start-up
current source derived from pin VIN. If the temperature is
still too high, the voltage at pin V
CC
will fall again to
V
CC(UVLO)
. This cycle is repeated until the junction
temperature falls 8 degrees (typical) below T
prot(max)
.
6.12
Burst standby mode
Pin CTRL and pin I
sense
are also used to implement the
burst standby mode feature. In burst standby mode, the
converter consumes less than 1 W (typical) of input power
at a maximum output power of 100 mW. This power is
sufficient to supply a low power device such as a
microcontroller. Burst standby mode is entered when a
current larger than the burst standby mode active current
I
burst
is forced into pin CTRL, via the opto-coupler, for a
period that is longer than the burst standby mode blanking
period t
blank(burst)
.
During a burst standby mode cycle, the soft-start capacitor
C
SS
, (see Fig.8) is charged to 1.25 V and then discharged
via the soft-start resistor R
SS
. When C
SS
is discharged to
0.5 V, a soft-restart is initiated. The frequency of a typical
burst standby mode cycle is approximately:
If, during a burst standby mode cycle, the voltage at
pin V
CC
falls below the trip level voltage V
CC(burst)
, the IC
will be supplied again from pin VIN. If V
CC(UVLO)
is reached
within the burst cycle period due to an external load on
pin V
CC
, a restart cycle begins. If during a burst standby
mode cycle, the voltage on pin V
CC
stays above the trip
level voltage V
CC(burst)
, a maximum burst efficiency is
obtained because the IC is being consistently powered by
the auxiliary winding.
6.13
Driver
The Gate of the external power MOSFET is driven from a
driver circuit having a current sourcing capability of
typically 100 mA, and a current sink capability of typically
500 mA. This permits fast turn-on and turn-off of the power
MOSFET for efficient operation.
A low driver source current has been chosen in order to
limit the
V/
t at switch-on. This reduces Electro Magnetic
Interference (EMI) and also limits the voltage spikes
across the current sense resistor R
sense
.
×
R
SS
C
SS
-----------1
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