tea1733mt NXP Semiconductors, tea1733mt Datasheet - Page 15

• Manufacturer Part Number: tea1733mt
• Description: Tea1733mt Greenchip Smps Control Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
TEA1733MT
Preliminary data sheet
Fig 10. Typical application
1 MΩ
R3
A power supply with the TEA1733MT is a flyback converter operating in Continuous
conduction mode (see
Capacitor C5 buffers the IC supply voltage, which is powered via resistor R3 at start-up
and via the auxiliary winding during normal operation. Sense resistor R9 converts the
current through the MOSFET S1 into a voltage on pin ISENSE. The value of R9 defines
the maximum primary peak current on MOSFET S1. Resistor R7 reduces the peak
current to capacitor C5.
In the example shown in
OVP level is set by diode Z1 to V
Temperature Coefficient (NTC) resistor R4. The VINSENSE pin is used for mains voltage
detection and resistors R1 and R2 set the start voltage to about 80 V (AC). The overpower
protection time is defined by capacitor C4 at 60 ms.
The restart time is defined by capacitor C4 and resistor R8 at 0.5 s.
Resistor R6 and capacitor C6 define the soft start time. Resistor R5 prevents the soft start
capacitor C6 from being charged during normal operation caused by negative voltage
spikes across the current sense resistor R9.
Capacitor C3 reduces noise on the CTRL pin.
25 V
Θ
C1
68 μF
Z1
100 nF
82 kΩ
C2
R2
R4
200 kΩ
R1
10 MΩ
All information provided in this document is subject to legal disclaimers.
C3
1 nF
220 nF
VINSENSE
PROTECT
OPTIMER
C4
CTRL
Rev. 1 — 4 February 2011
Figure
Figure
TEA1733MT
R8
2.2 MΩ
5
6
7
8
10).
10, the PROTECT pin is used for OVP and OTP. The
CC
4
3
2
1
= 25.8 V. The OTP level is set by Negative
4.7 μF
ISENSE
DRIVER
GND
VCC
C5
470 Ω
R5
R10
10 Ω
220 nF
22 kΩ
0.25 Ω
R6
C6
10 Ω
R7
R9
S1
GreenChip SMPS control IC
TEA1733MT
© NXP B.V. 2011. All rights reserved.
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