tea1733bt NXP Semiconductors, tea1733bt Datasheet - Page 7

• Manufacturer Part Number: tea1733bt
• Description: Greenchip Smps Control Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TEA1733BT
Product data sheet
7.10 Overpower or high/low line compensation
7.9 Current mode control (ISENSE pin)
Current mode control is used for its good line regulation.
The primary current is sensed by the ISENSE pin across an external resistor R9
(see
is proportional to the CTRL pin voltage (see
Leading edge blanking prevents false triggering due to capacitive discharge when
switching on the external power switch (see
(VINSENSE and ISENSE pins)
The overpower compensation function can be used to realize a maximum output power
which is nearly constant over the full input mains.
The overpower compensation circuit measures the input voltage on the VINSENSE pin
and outputs a proportionally dependent current on the ISENSE pin. The DC voltage
across the soft start resistor limits the maximum peak current on the current sense resistor
(see
Fig 6.
Fig 7.
Figure
Figure
Peak current control
Leading edge blanking
3) and compared with an internal control voltage. The internal control voltage
8).
All information provided in this document is subject to legal disclaimers.
V
sense(max)
(V)
0.6
0.4
0.2
Rev. 3 — 27 June 2011
0
0
V
frequency
reduction
sense(max)
V
ISENSE
t
1
leb
Figure
2
Figure
V
6).
7).
CTRL
3
014aaa932
014aaa931
(V)
GreenChip SMPS control IC
t
4
TEA1733BT
© NXP B.V. 2011. All rights reserved.
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