TEA1533AT/N1,518 NXP Semiconductors, TEA1533AT/N1,518 Datasheet - Page 10

• Manufacturer Part Number: TEA1533AT/N1,518
• Description: IC CTRLR SMPS GREEN OVP 14SOIC
• Manufacturer: NXP Semiconductors
• Series: GreenChip™ IIr

Specifications of TEA1533AT/N1,518

• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Output Isolation: Isolated
• Frequency Range: 25 ~ 175kHz
• Voltage - Input: 8.7 ~ 20 V
• Voltage - Output: 650V
• Power (watts): 750mW
• Operating Temperature: -20°C ~ 145°C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-2338-2; 935270018518; TEA1533ATD-T

Philips Semiconductors
Short winding protection
After the leading edge blanking time, the short winding
protection circuit is activated. If the ‘sense’ voltage
exceeds the short winding protection voltage V
converter will stop switching. Once V
UVLO level, capacitor C
supply will restart again. This cycle will be repeated until
the short-circuit is removed (safe restart mode).
The short winding protection will also protect in case of a
secondary diode short-circuit.
OverTemperature Protection (OTP)
An accurate temperature protection is provided in the
circuit. When the junction temperature exceeds the
thermal shutdown temperature, the IC will stop switching.
When V
recharged to the V
Regarding the TEA1533T, this IC will not start switching
again. Subsequently, V
level, etc. Operation only recommences when the V
voltage drops below a level of approximately 4.5 V
(practically when the V
short period).
Regarding the TEA1533AT, when the V
reached, switching starts again (safe restart mode). This
process is repeated as long as the OTP condition exists.
2002 Aug 23
handbook, halfpage
GreenChip
MGU236
CC
100 A
(typ)
drops to UVLO, capacitor C
Fig.9 OPP correction curve.
start
TM
I DEM
level.
II SMPS control IC
mains
CC
VCC
will drop again to the UVLO
has been disconnected for a
will be recharged and the
24 A
(typ)
CC
VCC
start
drops below the
0.52 V
(typ)
0.3 V
(typ)
V sense(max)
will be
level is
swp
, the
CC
10
Control pin protection
If pin CTRL is open-circuit or not connected, a fault
condition is assumed and the converter will stop switching.
Operation will recommence as soon as the fault condition
is removed.
Burst mode standby
Pin CTRL is also used to implement the burst mode
standby. In burst mode standby, the power supply enters
a special low dissipation state. Figure 11 shows a flyback
converter using the burst mode standby function. The
system enters burst mode standby when the
microcontroller activates NPN transistor T1 on the
secondary side.
When the voltage on C
measured by the microcontroller, the opto-coupler is
activated by T1, sending a large current signal to
pin CTRL. In response to this signal, the IC stops switching
and enters a ‘hiccup’ mode. This burst activation signal
should be present for longer than the ‘burst blank’ period
(typically 30 s): the blanking time prevents false burst
triggering due to spikes. Figure 12 shows the burst mode
standby signals. The hiccup mode during burst mode
standby operation does not differ from the hiccup mode at
safe restart during a system fault condition (e.g. output
short-circuit). The power is reduced during soft restart
mode.
Burst mode standby operation continues until the
microcontroller stops activating transistor T1. The system
then enters the start-up sequence and begins normal
switching behaviour.
I
burstmode
=
--------------- -
R
V
CTRL
th
TEA1533T; TEA1533AT
+
I
th(on)
micro
exceeds a certain voltage,
Product specification