L6562AT STMicroelectronics, L6562AT Datasheet - Page 16

• Manufacturer Part Number: L6562AT
• Description: Transition-mode PFC controller
• Manufacturer: STMicroelectronics

Application information
7.5
16/25
Comparison between the L6562AT and the L6562
The L6562AT is not a direct drop-in replacement of the L6562, even if both have the same
pin-out. One function (Disable) has been relocated.
Table 2 compares the two devices, i.e. those parameters that may result in different values
of the external components. The parameters that have the most significant impact on the
design, i.e. that definitely require external component changes when converting an L6562-
based design to the L6562AT, are highlighted in bold.
Table 6.
1. Function located on pin 5 (ZCD)
2. Function located on pin 1 (INV)
The lower value (-36%) for the clamp level of the current sense reference voltage allows the
use of a lower sense resistor for the same peak current, with a proportional reduction of the
associated power dissipation. Essentially, the advantage is the reduction of the power
dissipated in a single point (hotspot), which is a considerable benefit in applications where
heat removal is critical, e.g. in adapters enclosed in a sealed plastic case. The lower value
for the dynamic OVP triggering current allows the use of a higher resistance value (+48%)
for the upper resistor of the divider sensing the output voltage of the PFC stage (keeping the
same overvoltage level) with no significant increase of noise sensitivity. This reduction goes
in favor of standby consumption in applications required to comply with energy saving
regulations.
IC turn-on and turn-off thresholds (typ.)
Turn-off threshold spread (max.)
IC consumption before start-up (max.)
Multiplier gain (typ.)
Current sense reference clamp (typ.)
Current sense propagation delay (delay-to-output) (typ.)
Dynamic OVP triggering current (typ.)
ZCD arm/trigger/clamp thresholds (typ.)
Enable threshold (typ.)
Gate-driver internal drop (max.)
Leading-edge blanking on current sense
Reference voltage accuracy (overall)
L6562AT vs L6562
Parameter
2.1/1.4/0.7 V
12/9.5 V
0.3 V
200 ns
L6562
±0.8 V
70 uA
40 µA
1.7 V
2.6 V
2.4%
0.6
No
(1)
1.4/0.7/0 V
12.5/10 V
0.45 V
L6562AT
175 ns
±0.5 V
1.08 V
27 µA
60 uA
2.2 V
1.8%
0.38
Yes
L6562AT
(2)