TEA1761T/N2,118 NXP Semiconductors, TEA1761T/N2,118 Datasheet - Page 4

• Manufacturer Part Number: TEA1761T/N2,118
• Description: IC CTRLR GREENCHIP SYNC 8-SOIC
• Manufacturer: NXP Semiconductors
• Series: GreenChip™r

Specifications of TEA1761T/N2,118

• Mode: Discontinuous Conduction (DCM)
• Frequency - Switching: 125kHz
• Current - Startup: 60µA
• Voltage - Supply: 8.6 V ~ 38 V
• Operating Temperature: -20°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Voltage: 10 V
• Output Current: 5 mA
• Input Voltage: 8.6 V to 38 V
• Supply Current: 1 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935284211118

NXP Semiconductors
TEA1761T_2
Product data sheet
7.3 SMPS output voltage and current regulation
driver output is pulled to ground. After switch-on of the SR MOSFET, the input signal on
the SRSENSE pin is blanked for 2 s (typical). This will eliminate false switch-off due to
high frequency ringing at the start of the secondary stroke.
Because the driver output voltage is reduced as soon as the voltage on the SRSENSE pin
is 55 mV, the external power switch can be switched off fast when the current through the
switch reaches zero. With this zero-current switch off, no separate standby mode is
needed to maintain high efficiency during no-load operation. The zero current is detected
by sensing a 12 mV level on the SRSENSE pin. See
If the secondary stroke of the flyback converter is shorter than 2 s (typical), the driver
output is disabled. This will guarantee stable operation for very low duty cycles. When the
secondary stroke increases above 2.2 s (typical) then the driver output is again enabled.
The output voltage of the flyback Switched Mode Power Supply (SMPS) can be controlled
by sensing the output voltage via pin V
can regulate the output voltage of the switched mode power supply by regulating the
voltage on pin V
Also the output current of the flyback SMPS can be controlled or limited. The voltage on
pin I
Fig 3. Synchronous rectification signals
SENSE
Secondary
V
SRSENSE
V
Primary
DRIVER
current
current
is regulated or limited to 50 mV above the voltage on pin GND.
SENSE
, to 2.5 V.
Rev. 02 — 25 April 2007
SENSE
GreenChip synchronous rectifier controller
. The feedback loop via the primary controller
Figure
3.
TEA1761T
© NXP B.V. 2007. All rights reserved.
014aaa057
0 V
0 A
0 A
0 V
12 mV
55 mV
310 mV
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