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TEA1750_2
?NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02  15 December 2008
18 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
7.3.9   Overcurrent protection (FBSENSE pin)
The primary peak current in the transformer is measured accurately cycle-by-cycle using
the external sense resistor R
SENSE2
. The OCP circuit limits the voltage on pin FBSENSE
to an internal level (see also
Section
7.3.3). The OCP detection is suppressed during the
leading edge blanking period, t
leb
, to prevent false triggering caused by switch-on spikes.
7.3.10  Driver (pin FBDRIVER)
The driver circuit to the gate of the external power MOSFET has a current sourcing
capability of typically 500 mA and a current sink capability of typically 1.2 A. This permits
fast turn-on and turn-off of the power MOSFET for efcient operation.
8.   Limiting values
Fig 13.  OCP leading edge blanking
LEB (t
leb
)
OCP LEVEL
V
FBSENSE
t
014aaa022
Table 3.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
Voltages
V
CC
supply voltage
0.4
+38
V
V
LATCH
voltage on pin LATCH
current limited
0.4
+5
V
V
FBCTRL
voltage on pin FBCTRL
0.4
+5
V
V
PFCCOMP
voltage on pin PFCCOMP
0.4
+5
V
V
VINSENSE
voltage on pin VINSENSE
0.4
+5
V
V
VOSENSE
voltage on pin VOSENSE
0.4
+5
V
V
PFCAUX
voltage on pin PFCAUX
25
+25
V
V
FBSENSE
voltage on pin FBSENSE
current limited
0.4
+5
V
V
PFCSENSE
voltage on pin PFCSENSE
current limited
0.4
+5
V
V
HV
voltage on pin HV
0.4
+650
V
Currents
I
FBCTRL
current on pin FBCTRL
3
0
mA
I
FBAUX
current on pin FBAUX
1
+1
mA
I
PFCSENSE
current on pin PFCSENSE
1
+10
mA
I
FBSENSE
current on pin FBSENSE
1
+10
mA
I
FBDRIVER
current on pin FBDRIVER
duty cycle < 10 %
0.8
+2
A
I
PFCDRIVER
current on pin PFCDRIVER    duty cycle < 10 %
0.8
+2
A
I
HV
current on pin HV
-
5
mA
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