參數(shù)資料
型號(hào)： 935256880112
廠商： NXP SEMICONDUCTORS
元件分類： 穩(wěn)壓器
英文描述： 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDIP8
封裝： SOT-97, DIP-8
文件頁(yè)數(shù)： 6/22頁(yè)
文件大小： 154K
代理商： 935256880112
1998 Aug 19
14
Philips Semiconductors
Preliminary specication
Greeny; GreenChip
TEA1501
LOW POWER STANDBY APPLICATION
Greeny can operate as a stand alone low power supply or
as a standby power supply incorporated in a main SMPS.
Together with a GreenChip
TEA1504 a power supply
with ultra low standby power can be built where Greeny
supplies the microprocessor with the power on/off
indicator and the GreenChip
controls the main power
supply during normal operation.
Operation modes
The power supply with a Greeny TEA1501 and a
GreenChip
TEA1504 can be in three different modes,
according to the state of switches S1 and S2 (see Fig.9).
Table 1
Operation modes of power supply
Power supply in Off mode
The power supply can be switched on and off by means of
the functional switch S1. This functional switch replaces
the generally used high voltage mains switch. The power
supply is in Off mode if the switch S1 is open.
If the switch S1 is closed the voltage applied on the OOD
pin of Greeny is above the on/off level (0.7 V) and Greeny
starts up, the power supply enters the Standby mode or
the Normal operation mode.
S1
S2
OPERATION MODE
Open
Open or
Closed
Greeny is in Off mode,
GreenChip
is in Off mode, Power
supply is in Off mode.
Closed
Open
Greeny is On mode,
GreenChip
is in Off mode,
Power supply is in Standby mode.
Closed
Greeny is in On mode,
GreenChip
is in On mode,
Power supply is in Normal
operation mode.
When the switch S1 is opened the voltages on the OOD
pin of Greeny and the OOB pin of the GreenChip
are 0 V.
The power supply and the power on/off indicator (LED) are
switched off immediately and the power supply is in the
Off mode again.
Power supply in Standby mode
When switch S1 is closed Greeny is in the On mode and
supplies the microprocessor and the power on/off
indicator. The microprocessor controls the state of switch
S2. The power supply is in the Standby mode when switch
S2 is open.
The output power of Greeny is determined by the
microprocessor and is below the Pdata level when switch
S2 is open. The clamp level on the OOD pin of Greeny is
the data-off level with a typical value of 1.3 V which is
below the on/off level of the GreenChip
which has a
typical value of 2.5 V. The GreenChip
remains in Off
mode.
Power supply in Normal operation mode
The power supply changes its operation mode from
Standby to Normal operation by closing the switch S2. The
switch S2 is placed at the isolated secondary side of the
Greeny and controls, via the data transfer function of
Greeny, the operation mode of the power supply.
When the microprocessor closes switch S2 the output
power of Greeny is increased. The output power exceeds
the Pdata level and the clamp level on the OOD pin of
Greeny is set to data-on level with a value of 4 V. The
voltage on the OOB pin of the GreenChip
is above its
on/off level of 2.5 V and the GreenChip
starts up.
The power supply enters Normal operation mode, Greeny
supplies the microprocessor and the GreenChip
supplies
the main load.
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