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TEA1533AP View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TEA1533AP
Philips
Philips Electronics Philips
TEA1533AP Datasheet PDF : 24 Pages
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Philips Semiconductors
GreenChipTMII SMPS control IC
Product specification
TEA1533P; TEA1533AP
PINNING
SYMBOL PIN
DESCRIPTION
VCC
GND
1 supply voltage
2 ground
CTRL
3 control input
DEM
4 input from auxiliary winding for
demagnetization timing, overvoltage
and overpower protection
Isense
DRIVER
5 programmable current sense input
6 gate driver output
HVS
7 high voltage safety spacer, not
connected
DRAIN
8 drain of external MOS switch, input for
start-up current and valley sensing
FUNCTIONAL DESCRIPTION
The TEA1533 is the controller of a compact flyback
converter, and is situated at the primary side. An auxiliary
winding of the transformer provides demagnetization
detection and powers the IC after start-up.
The TEA1533 can operate in multi modes (see Fig.4).
f
handbook, halfp(akgHe z)
175
VCO
fixed
MGU508
quasi resonant
25
P (W)
Fig.4 Multi modes operation.
handbook, halfpage
VCC 1
8 DRAIN
GND 2 TEA1533P 7 HVS
CTRL 3 TEA1533AP 6 DRIVER
DEM 4
5 Isense
MGU507
Fig.3 Pin configuration.
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 the 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 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.
Start-up, mains enabling operation level and
undervoltage lock-out
Initially, the IC is self supplying from the rectified mains
voltage via pin DRAIN (see Figs 11 and 12). Supply
capacitor CVCC is charged by the internal start-up current
source to approximately 4 V or higher, depending on the
voltage on pin DRAIN.
2002 Aug 23
5
 

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