ON5250,135 NXP Semiconductors, ON5250,135 Datasheet - Page 5

• Manufacturer Part Number: ON5250,135
• Description: MOSFET RF SOT223 SC-73
• Manufacturer: NXP Semiconductors

Specifications of ON5250,135

• Package / Case: SOT-223 (3 leads + Tab), SC-73, TO-261
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current Rating: -
• Power - Output: -
• Frequency: -
• Gain: -
• Transistor Type: -
• Noise Figure: -
• Current - Test: -
• Voltage - Test: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 934057275135

Philips Semiconductors
PINNING
2002 Aug 23
handbook, halfpage
SYMBOL PIN
V
GND
CTRL
DEM
I
DRIVER
HVS
DRAIN
sense
CC
GreenChip
1
2
3
4
5
6
7
8
CTRL
GND
DEM
V CC
Fig.3 Pin configuration.
supply voltage
ground
control input
input from auxiliary winding for
demagnetization timing, overvoltage
and overpower protection
programmable current sense input
gate driver output
high voltage safety spacer, not
connected
drain of external MOS switch, input for
start-up current and valley sensing
TM
1
2
3
4
II SMPS control IC
TEA1533AP
TEA1533P
DESCRIPTION
MGU507
8
7
6
5
DRAIN
HVS
DRIVER
I sense
5
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).
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 C
source to approximately 4 V or higher, depending on the
voltage on pin DRAIN.
handbook, halfpage
(kHz)
VCC
175
f
25
Fig.4 Multi modes operation.
is charged by the internal start-up current
VCO
TEA1533P; TEA1533AP
fixed
quasi resonant
Product specification
MGU508
P (W)