L4984D STMicroelectronics, L4984D Datasheet - Page 3

• Manufacturer Part Number: L4984D
• Description: Power Factor Correction ICs Current Mode PFC CCM Line Modulated Bi
• Manufacturer: STMicroelectronics

Specifications of L4984D

• Rohs: yes

L4984
List of figures
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Figure 38.
Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IC consumption vs. V
IC consumption vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
V
Startup & UVLO vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Feedback reference vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
E/A output clamp levels vs. Tj. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
UVLO saturation vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OVP levels vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inductor saturation threshold vs. Tj. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
V
Timer pin charging current vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Brownout threshold (on VFF) vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
R
Line drop detection threshold vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
V
PFC_OK enable threshold vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
FFD threshold vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Multiplier characteristics at V
Multiplier characteristics at V
Multiplier gain vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gate drive clamp vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gate drive output saturation vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Delay to output vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Line-modulated fixed-off-time modulator: a) internal block diagram; b) key waveforms. . . 17
Typical frequency change along a line half-cycle in a boost PFC
operated in LM-FOT (left) and TM (right) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Line-modulated fixed-off-time-controlled boost PFC: current waveforms . . . . . . . . . . . . . . 19
Line-modulated fixed-off-time-controlled boost PFC: input current harmonic contents . . . 20
Output voltage setting, OVP and FFD functions: internal block diagram . . . . . . . . . . . . . . 21
Voltage feedforward: squarer-divider (1/V2) block diagram and transfer characteristic . . . 23
R
Startup mechanisms and activations of the soft-start function . . . . . . . . . . . . . . . . . . . . . . 26
Effect of boost inductor saturation on MOSFET current and detection method . . . . . . . . . 27
THD optimizer circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
HD optimization: standard PFC controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Interface circuits that let DC-DC converter controller IC disable the L4984 . . . . . . . . . . . . 30
SSO10 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CC
cs
MULTpk
FF
FF
·C
clamp vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
discharge vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Zener voltage vs. Tj. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FF
- V
as a function of 3rd harmonic distortion introduced in the input current . . . . . . . . 25
VFF
dropout vs. Tj. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FF
FF
Doc ID 023489 Rev 3
=1 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
=3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
List of figures
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