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PDF TEA1533P Data sheet ( Hoja de datos )
| Número de pieza | TEA1533P | |
| Descripción | GreenChip SMPS control IC | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1533P; TEA1533AP
GreenChipTMII SMPS control IC
Product specification
Supersedes data of 2002 May 31
2002 Aug 23
1 page  
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
5 Page 
Philips Semiconductors
GreenChipTMII SMPS control IC
Product specification
TEA1533P; TEA1533AP
Soft start-up
To prevent transformer rattle during hiccup, the
transformer peak current is slowly increased by the soft
start function. This can be achieved by inserting a resistor
and a capacitor between pin Isense and the sense resistor
(see Fig.10). An internal current source charges the
capacitor to V = ISS × RSS, with a maximum of
approximately 0.5 V.
The start level and the time constant of the increasing
primary current level can be adjusted externally by
changing the values of RSS and CSS.
Iprimary(max) = V-----o--c---p----–--R--(--sI--S-e--nS---s--×e-----R----S---S----)
τ = RSS × CSS
The charging current ISS will flow as long as the voltage on
pin Isense is below approximately 0.5 V. If the voltage on
pin Isense exceeds 0.5 V, the soft start current source will
start limiting the current ISS. At the VCC(start) level, the ISS
current source is completely switched off.
Since the soft start current ISS is subtracted from pin VCC
charging current, the RSS value will affect the VCC charging
current level by a maximum of 60 µA (typical value).
Driver
The driver circuit to the gate of the power MOSFET has a
current sourcing capability of 170 mA typical and a current
sink capability of 700 mA typical. This permits fast turn-on
and turn-off of the power MOSFET for efficient operation.
A low driver source current has been chosen to limit the
∆V/∆t at switch-on. This reduces Electro Magnetic
Interference (EMI) and also limits the current spikes
across Rsense.
handbook, halfpage
0.5 V
ISS
start-up
5 Isense RSS
Vocp
CSS
Fig.10 Soft start.
Rsense
MGU237
2002 Aug 23
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet TEA1533P.PDF ] | |
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