TEA1533T Ver la hoja de datos (PDF) - Philips Electronics
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Fabricante
TEA1533T Datasheet PDF : 24 Pages
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Philips Semiconductors
GreenChipTMII SMPS control IC
Product specification
TEA1533T; TEA1533AT
PINNING
SYMBOL PIN
DESCRIPTION
n.c.
1 not connected
VCC
GND
2 supply voltage
3 ground
n.c.
4 not connected
n.c.
5 not connected
CTRL
6 control input
DEM
7 input from auxiliary winding for
demagnetization timing, overvoltage
and overpower protection
n.c.
8 not connected
Isense
n.c.
9 programmable current sense input
10 not connected
DRIVER 11 gate driver output
HVS
12 high voltage safety spacer, not
connected
HVS
13 high voltage safety spacer, not
connected
DRAIN
14 drain of external MOS switch, input for
start-up current and valley sensing
handbook, halfpage
n.c. 1
VCC 2
GND 3
n.c. 4
n.c. 5
CTRL 6
DEM 7
14 DRAIN
13 HVS
12 HVS
TEA1533T 11 DRIVER
TEA1533AT
10 n.c.
9 Isense
8 n.c.
MGU501
Fig.3 Pin configuration.
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.
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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