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PDF L4984 Data sheet ( Hoja de datos )
| Número de pieza | L4984 | |
| Descripción | CCM PFC controller | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L4984 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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L4984
CCM PFC controller
Features
■ Line-modulated fixed-off-time (LM-FOT)
control of CCM-operated PFC pre-regulators
■ Proprietary LM-FOT modulator for nearly fixed-
frequency operation
■ Proprietary multiplier design for minimum THD
of AC input current
■ Fast “bi-directional” input voltage feedforward
(1/V2 correction)
■ Accurate adjustable output overvoltage
protection
■ Protection against feedback loop failure
(latched shutdown)
■ Inductor saturation protection
■ AC brownout detection
■ Digital leading-edge blanking on current sense
■ Soft-start
■ 1% (at Tj = 25 °C) internal reference voltage
■ - 600 / + 800 mA totem pole gate driver with
active pull-down during UVLO and voltage
clamp
■ SSOP10 package
Applications
■ PFC pre-regulators for:
– IEC61000-3-2 and JEIDA-MITI compliant
SMPS in excess of 1 KW
– Desktop PC, server, web server
Datasheet — preliminary data
SSOP10
Table 1. Device summary
Order code
Package
L4984D
L4984DTR
SSOP10
Packaging
Tube
Tape and reel
August 2012
Doc ID 023489 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
www.bdtic.com/ST
1/35
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35
1 page  
L4984
2
Block diagram
Figure 1. Electrical diagram
Block diagram
…
Doc ID 023489 Rev 1
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5 Page 
L4984
Electrical characteristics
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Test condition
ΔV Dropout VMULTpk-VVFF
ΔVVFF
ΔVVFF
Line drop detection threshold
Line drop detection threshold
RDISCH Internal discharge resistor
VDIS
Disable threshold
VEN Enable threshold
Fixed-off-time modulator
ITIMER
TOFF
RDIS
CTIMER
TOFF_pk
Soft-start
Programming current
Programmed off-time
Discharge resistance
Timing capacitor range
Programming range
TSS
VMULTx
Gate driver
Activation time
Pull-up voltage
VOL
VOH
Isrcpk
Isnkpk
tf
tr
VOclamp
Output low voltage
Output high voltage
Peak source current
Peak sink current
Voltage fall time
Voltage rise time
Output clamp voltage
UVLO saturation
1. Parameters tracking each other.
2. The multiplier output is given by:
Before turn-on
After turn-on
Below peak value
Below peak value Tj = 25 °C
(1) Voltage falling
(1) Voltage rising
VMULT = 1 V
VMULT = 1 V
On the peak of VMULT
10 kΩ from MULT to GND
Isink = 100 mA
Isource = 5 mA
Isource = 5 mA; Vcc = 20 V
VCC = 0 to VCCon, Isink = 2 mA
Min.
40
60
5
0.745
0.845
148
2.88
35
0.1
1.45
9.8
-0.6
0.8
10
Typ.
70
70
10
0.8
0.88
Max.
800
20
100
90
20
0.855
0.915
Unit
mV
mV
mV
kΩ
V
V
156 163
3 3.18
60 120
2.2
50
µA
µs
Ω
nF
µs
300 µs
4.1 V
0.6 1.2
10.3
30 60
45 110
12 15
1.1
V
V
A
A
ns
ns
V
V
Vcs
V
CS_Ofst
K
M
VMULT VCOMP 2.5
VV2FF
Doc ID 023489 Rev 1
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet L4984.PDF ] | |
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