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PDF TEA1552T Data sheet ( Hoja de datos )
| Número de pieza | TEA1552T | |
| Descripción | GreenChipII SMPS control IC | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1552
GreenChip™II SMPS control IC
Product specification
Supersedes data of 2002 Jul 03
2002 Aug 27
1 page  
Philips Semiconductors
GreenChip™II SMPS control IC
Product specification
TEA1552
PINNING
SYMBOL PIN
DESCRIPTION
VCOadj 1 VCO adjustment input
Isense
STDBY
2 programmable current sense input
3 standby indication or control output
DRIVER 4 gate driver output
HVS
5 high voltage safety spacer, not
connected
HVS
6 high voltage safety spacer, not
connected
DRAIN
7 drain of external MOS switch, input for
start-up current and valley sensing
VCC 8 supply voltage
n.c. 9 not connected
GND
10 ground
VCC(5V)
LOCK
11 5 V output
12 lock input
CTRL
13 control input
DEM
14 input from auxiliary winding for
demagnetization timing, OVP and OPP
FUNCTIONAL DESCRIPTION
The TEA1552 is the controller of a compact flyback
converter, with the IC situated at the primary side.
An auxiliary winding of the transformer provides
demagnetization detection and powers the IC after
start-up.
The TEA1552 operates in multi modes (see Fig.4).
The next converter stroke is started only after
demagnetization of the transformer current (zero current
switching), while the drain voltage has reached the lowest
voltage to prevent switching losses (green function). The
primary resonant circuit of primary inductance and drain
capacitor ensures this quasi-resonant operation. The
design can be optimized in such a way that zero voltage
switching can be reached over almost the complete
universal mains range.
To prevent very high frequency operation at lower loads,
the quasi-resonant operation changes smoothly in fixed
frequency PWM control.
At very low power (standby) levels, the frequency is
controlled down, via the VCO, to a minimum frequency of
approximately 25 kHz.
handbook, halfpage
VCOadj 1
14 DEM
Isense 2
STDBY 3
13 CTRL
12 LOCK
DRIVER 4 TEA1552T 11 VCC(5V)
HVS 5
10 GND
HVS 6
9 n.c.
DRAIN 7
8 VCC
MBL497
Start-up, mains enabling operation level and
undervoltage lock-out (see Figs 11 and 12)
Initially, the IC is self supplying from the rectified mains
voltage via pin DRAIN. Supply capacitor CVCC is charged
by the internal start-up current source to a level of
approximately 4 V or higher, depending on the drain
voltage. Once the drain voltage exceeds the M-level
(mains-dependent operation-enabling level), the start-up
current source will continue charging capacitor CVCC
(switch S1 will be opened); see Fig.2. The IC will activate
the power converter as soon as the voltage on pin VCC
passes the level VCC(start). The IC supply is taken over by
the auxiliary winding as soon as the output voltage
reaches its intended level and the IC supply from the
mains voltage is subsequently stopped for high efficiency
operation (green function).
The moment the voltage on pin VCC drops below the
undervoltage lock-out level VUVLO, the IC stops switching
and enters a safe restart from the rectified mains voltage.
Inhibiting the auxiliary supply by external means causes
the converter to operate in a stable, well defined burst
mode.
Fig.3 Pin configuration.
Supply management
All (internal) reference voltages are derived from a
temperature compensated, on-chip band gap circuit.
2002 Aug 27
5
5 Page 
Philips Semiconductors
GreenChip™II SMPS control IC
Product specification
TEA1552
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134); note 1.
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
Voltages
VVCOadj
Vsense
VDRAIN
VCC
VLOCK
VCTRL
VDEM
Currents
Isense
ISTDBY
IDRIVER
IDRAIN
ICC(5V)
ICTRL
IDEM
General
Ptot
Tstg
Tj
ESD
Vesd
voltage on pin VCOadj
voltage on pin Isense
voltage on pin DRAIN
supply voltage
voltage on pin LOCK
voltage on pin CTRL
voltage on pin DEM
current on pin Isense
current on pin STDBY
current on pin DRIVER
current on pin DRAIN
current on pin VCC(5V)
current on pin CTRL
current on pin DEM
total power dissipation
storage temperature
junction temperature
electrostatic discharge voltage
pins 1 to 6 and pins 9 to 14
pin 7
any other pin
continuous
current limited
continuous
continuous
current limited
d < 10%
Tamb < 70 °C
−0.4
−0.4
−0.4
−0.4
−0.4
−0.4
−0.4
−1
−1
−0.8
−
−1
−
−250
−
−55
−20
+5
−
+650
+20
+7
+5
−
+10
−
+2
+5
0
+5
+250
0.75
+150
+145
V
V
V
V
V
V
V
mA
mA
A
mA
mA
mA
µA
W
°C
°C
HBM class 1; note 2
HBM class 1; note 2
MM; note 3
−
−
−
2 000
1 500
400
V
V
V
Notes
1. All voltages are measured with respect to ground; positive currents flow into the chip; pin VCC may not be current
driven. The voltage ratings are valid provided other ratings are not violated; current ratings are valid provided the
maximum power rating is not violated.
2. Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
3. Equivalent to discharging a 200 pF capacitor through a 0.75 µH coil and a 10 Ω resistor.
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
Rth(j-a)
thermal resistance from junction to ambient
in free air; note 1
Note
1. With pin GND connected to sufficient copper area on the printed-circuit board.
VALUE
100
UNIT
K/W
2002 Aug 27
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet TEA1552T.PDF ] | |
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