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PDF TEA1501 Data sheet ( Hoja de datos )
| Número de pieza | TEA1501 | |
| Descripción | Greeny; GreenChip | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1501
Greeny; GreenChip™
Preliminary specification
File under Integrated Circuits, IC11
1998 Aug 19
1 page  
Philips Semiconductors
Greeny; GreenChip™
Preliminary specification
TEA1501
FUNCTIONAL DESCRIPTION
The TEA1501 contains a high voltage power switch, a high
voltage startup circuit and low voltage control circuitry on
the same IC. Together with a transformer and a few
external components a low power, isolated, flyback
converter can be built. The Greeny system operates in a
burst mode. During each burst period the output voltage is
regulated to a desired voltage level.
System operation
ON/OFF
The Greeny system can be switched on and off by means
of a low cost, low voltage switch. In the Off mode the
startup current source and power switch are disabled. In
the On mode, Greeny delivers the startup current for the
supply capacitor and after the supply voltage reaches the
startup level Greeny activates the power switch.
STARTUP
The startup is realized with a high voltage startup current
source instead of a dissipative bleeder resistor which is
commonly used by low voltage control ICs. When Greeny
is switched on, the startup current source is enabled and
starts charging the Vaux capacitor. The startup current
level is high and accurate (typical 1.8 mA) which results in
a well-defined and short startup time, within 0.25 s. After
the supply voltage reaches the startup level the current
source is switched off and the Vaux capacitor supplies the
chip. Reducing the power dissipation in the current source
to zero after startup is one of the green features of Greeny.
OPERATION
After startup the flyback converter starts delivering energy
to the secondary and auxiliary winding. The Greeny
system works with fixed switching frequency and fixed
peak current.
As all the windings of the flyback transformer have the
same flux variation, the secondary voltage and the
auxiliary voltage are related via the turns-ratio (ns/na).
Therefore, the isolated secondary voltage is controlled by
the non-isolated auxiliary voltage.
The burst mode operates by switching at high frequency
until the Vaux voltage reaches its regulation level of 20 V.
Greeny stops switching until the time period set by the
burst oscillator has expired. At the start of the next burst
period Greeny starts switching at high frequency and
repeats the cycle again.
To guarantee a stable operation in a burst mode controlled
system a Vaux slope compensation circuit is integrated in
Greeny. The Greeny system delivers a constant voltage to
the secondary load until a burst duty cycle of 40%.
DATA TRANSFER
The TEA1501 has a data transfer function which makes
communication from the isolated secondary side to the
non-isolated primary side of the transformer possible,
without using an opto-coupler. This communication
function is activated by increasing the secondary load.
With this data transfer function a main power supply can
be switched on and off by the Greeny system.
The power delivered to the secondary and auxiliary
winding is proportional to the number of primary current
pulses per burst period, provided that the converter
operates in discontinuous conduction mode. During each
burst period the number of primary current pulses is
counted. A threshold (Ndata) of 56 pulses is integrated. The
clamp level on the OOD pin is set to data-on level from
data-off level in case the Ndata threshold is passed. This
data-on clamp level can be sensed by the on/off input of a
main supply control IC of the GreenChip™ family. The
data-on clamp level is maintained until a burst appears
with a number of pulses below the Ndata threshold.
1998 Aug 19
5
5 Page 
Philips Semiconductors
Greeny; GreenChip™
Preliminary specification
TEA1501
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134). All voltages are referred to ground. Positive
currents flow into the IC. All pins not mentioned in the voltage list are not allowed to be voltage driven.
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
Voltages
VDrn
VSrc
VVaux
VBt
commutation voltage peak: Vin + Vzener
Currents
IDrn
ISrc
IOOD
IRef
IBt
Power and temperature
Ptot
Tj
Tstg
Tamb
total power dissipation, Tamb < 70 °C
junction temperature
storage temperature
operating ambient temperature
−0.4
−0.4
−0.4
−0.4
0
0
−1
−1
−1
−
−10
−40
−10
+650
+12
+24
+5
0.25
0.25
+5
+0
+0.05
0.7
+140
+150
+70
V
V
V
V
A
A
mA
mA
mA
W
°C
°C
°C
THERMAL CHARACTERISTICS
SYMBOL
Rth(j-a)
PARAMETER
thermal resistance from junction to ambient
CONDITIONS VALUE
in free air
96
UNIT
°C/W
1998 Aug 19
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TEA1501.PDF ] | |
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