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(kāi)關(guān)電源與同步功能控制IC
文件頁(yè)數(shù)： 7/19頁(yè)
文件大?。?/td> 112K
代理商： TEA1541
2003 Aug 11
7
Philips Semiconductors
Product specification
SMPS control IC with
synchronization function
TEA1541
6.1
Start-up, mains voltage-dependent
operation-enabling level and undervoltage
lock-out
Initially, the IC is supplied by the rectified mains voltage at
pin VIN. When the voltage at pin V
CC
is below the V
CC
voltage for VIN current trip level V
CC(trip)(VIN)
, the supply
current drawn from pin VIN, (I
VIN
) is at the low value
I
VIN(min)
. When V
CC
rises to the V
CC(trip)(VIN)
level, the
current at pin VIN changes to the high value I
VIN(max)
.
When the voltage at pin VIN is below the mains
voltage-dependent operation-enabling level (M-level), the
IC supply capacitor C
VCC
is charged by the internal
start-up current source to approximately 5 V. When the
voltage at pin VIN exceeds the M-level, the start-up
current source continues to charge C
VCC
(switch S1 open;
see Fig.2).
When V
CC
reaches the start-up voltage level V
CC(start)
, the
IC switches to high efficiency (green function) operation by
no longer drawing current from pin VIN (see Fig.5).
At V
CC(start)
the IC activates the external MOSFET. When
the voltage across the auxiliary winding rises above the
voltage across C
VCC
, the IC supply current will be supplied
by the auxiliary winding via pin V
CC
.
If the voltage on pin V
CC
falls below the V
CC
undervoltage
lock-out level V
CC(UVLO)
, the IC stops switching and enters
a safe restart mode in which current to the IC is supplied
by the rectified mains voltage via pin VIN, and C
VCC
is
re-charged by the internal start-up current source to
V
CC(start)
.
Inhibiting the auxiliary supply by external means causes
the converter to operate in a stable, well-defined burst
mode. This is a burst standby mode that is less efficient
than the normal burst standby mode described in
section 6.12.
Ifthevoltageatpin VINfallsbelowthemainsundervoltage
lock-out level M
UVLO
, a safe restart mode is activated, and
the IC stops switching.
During normal operation (non-burst standby mode), the
duty cycle of the IC, and thus the output power of the
supply, is regulated by a control voltage at pin CTRL.
If pin V
CC
is connected to ground, the IC switches to low
power standby operation and the start-up current drawn
via pin VIN reduces to 400
μ
A (typical). When the voltage
on pin V
CC
rises above 700 mV (typical), the start-up
current increases to 1 mA (typical).
6.2
Supply management
All internal reference voltages are derived from a
temperature compensated, on-chip bandgap.
handbook, halfpage
MDB085
synchronized operation
unsynchronized operation
VCO
variable
P(W)
6
25
50
VCO
fixed
Fig.4 Multi mode operation.
handbook, halfpage
M-level
VIN
VCC(start)
VCC(trip)(VIN)
VCC
IVIN(max)
IVIN(min)
IVIN
ICC
MDB087
Fig.5 Start-up sequence.
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