TEA1750 NXP Semiconductors, TEA1750 Datasheet - Page 18

• Manufacturer Part Number: TEA1750
• Description: GreenChip III SMPS control IC
• Manufacturer: NXP Semiconductors

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NXP Semiconductors
8. Limiting values
TEA1750_2
Product data sheet
7.3.10 Driver (pin FBDRIVER)
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
to an internal level (see also
leading edge blanking period, t
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 efficient operation.
Table 3.
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Voltages
V
V
V
V
V
V
V
V
V
V
Currents
I
I
I
I
I
I
I
FBCTRL
FBAUX
PFCSENSE
FBSENSE
FBDRIVER
PFCDRIVER
HV
Fig 13. OCP leading edge blanking
CC
LATCH
FBCTRL
PFCCOMP
VINSENSE
VOSENSE
PFCAUX
FBSENSE
PFCSENSE
HV
Limiting values
Parameter
supply voltage
voltage on pin LATCH
voltage on pin FBCTRL
voltage on pin PFCCOMP
voltage on pin VINSENSE
voltage on pin VOSENSE
voltage on pin PFCAUX
voltage on pin FBSENSE
voltage on pin PFCSENSE
voltage on pin HV
current on pin FBCTRL
current on pin FBAUX
current on pin PFCSENSE
current on pin FBSENSE
current on pin FBDRIVER
current on pin PFCDRIVER
current on pin HV
Rev. 02 — 15 December 2008
OCP LEVEL
V
LEB (t
FBSENSE
Section
SENSE2
leb
leb
, to prevent false triggering caused by switch-on spikes.
)
. The OCP circuit limits the voltage on pin FBSENSE
7.3.3). The OCP detection is suppressed during the
Conditions
current limited
current limited
current limited
duty cycle < 10 %
duty cycle < 10 %
014aaa022
t
GreenChip III SMPS control IC
Min
-
0.4
0.4
0.4
0.4
0.4
0.4
25
0.4
0.4
0.4
3
1
1
1
0.8
0.8
TEA1750
© NXP B.V. 2008. All rights reserved.
Max
+38
+5
+5
+5
+5
+5
+25
+5
+5
+650
0
+1
+10
+10
+2
+2
5
Unit
V
V
V
V
V
V
V
V
V
V
mA
mA
mA
mA
A
A
mA
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