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PDF L6566BH Data sheet ( Hoja de datos )
| Número de pieza | L6566BH | |
| Descripción | Multimode controller | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L6566BH
Multimode controller for SMPS
Features
■ Selectable multimode operation:
fixed frequency or quasi-resonant
■ On-board 800 V high-voltage start-up
■ Advanced light load management
■ Low quiescent current (< 3 mA)
■ Adaptive UVLO
■ Line feedforward for constant power capability
vs mains voltage
■ Pulse-by-pulse OCP, shutdown on overload
(latched or autorestart)
■ Transformer saturation detection
■ Programmable frequency modulation for EMI
reduction
■ Latched or autorestart OVP
■ Brownout protection
Figure 1. Block diagram
SO16N
■ -600/+800 mA totem pole gate driver with
active pull-down during UVLO
■ SO16N package
Applications
■ Industrial SMPS
■ SMPS running off rectified 3-phase input line
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VREF
SS
COMP
VFF
1
HV
Icharge
VCC 5
10 14
SOFT-START
&
FAULT MNGT
TIME
OUT
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
Reference
voltages
Internal supply
UVLO
VCC
9
LOW CLAMP
& DISABLE
OFF2
15 VCC
OVP
LINE VOLTAGE
FEEDFORWARD
6.4V
1 mA
7.7V
OVPL
Q
LEB
1.5 V
7
Vth
-+
PWM
-+ +-
OCP
VCC
6
FMOD
UVLO_SHF
-
+
400 uA
5.7V
+
-
BURST-MODE
Hiccup-mode
OCP logic
OCP2
14V
4
OSC 13
OSCILLATOR
MODE/SC 12
50 mV
100 mV
ZCD
11
MODE SELECTION
&
TURN-ON LOGIC
-
ZERO CURRENT
DETECTOR
+
OVERVOLTAGE
PROTECTION
OVP
R
Q
S
TIME
OUT OVPL
LATCH
OFF2
IC_LATCH
DRIVER
4.5V
8
AC_OK
16
3V
15 µA
0.450V
0.485V
-
+
AC_FAIL
UVLO
DISABLE
3
CS
GD
DIS
GND
November 2009
Doc ID 16610 Rev 1
1/48
www.st.com
48
1 page  
L6566BH
1 Description
Description
The L6566BH is an extremely versatile current-mode primary controller ICs, specifically
designed for high-performance offline flyback converters running off rectified 3-phase input
line. It is also suited for single-stage single-switch input-current-shaping converters (single-
stage PFC) for applications supposed to comply with EN61000-3-2 or JEITA-MITI
regulations.
Both fixed-frequency (FF) and quasi-resonant (QR) operation are supported. The user can
pick either of the two depending on application needs. The device features an externally
programmable oscillator: it defines converter’s switching frequency in FF mode and the
maximum allowed switching frequency in QR mode.
When FF operation is selected, the ICs work like a standard current-mode controller with a
maximum duty cycle limited at 70% min. The oscillator frequency can be modulated to
mitigate EMI emissions.
QR operation, when selected, occurs at heavy load and is achieved through a transformer
demagnetization sensing input that triggers MOSFET’s turn-on. Under some conditions,
ZVS (zero-voltage switching) can be achieved. Converter’s power capability rise with the
mains voltage is compensated by line voltage feedforward. At medium and light load, as the
QR operating frequency equals the oscillator frequency, a function (valley skipping) is
activated to prevent further frequency rise and keep the operation as close to ZVS as
possible.
With either FF or QR operation, at very light load the ICs enter a controlled burst-mode
operation that, along with the built-in non-dissipative high-voltage start-up circuit and the low
quiescent current, helps keep low the consumption from the mains and meet energy saving
recommendations.
An innovative adaptive UVLO helps minimize the issues related to the fluctuations of the
self-supply voltage due to transformer’s parasites.
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The protection functions included in this device are: not-latched input undervoltage
(brownout), output OVP (auto-restart or latch-mode selectable), a first-level OCP with
delayed shutdown to protect the system during overload or short circuit conditions (auto-
restart or latch-mode selectable) and a second-level OCP that is invoked when the
transformer saturates or the secondary diode fails short. A latched disable input allows easy
implementation of OTP with an external NTC, while an internal thermal shutdown prevents
IC overheating.
Programmable soft-start, leading-edge blanking on the current sense input for greater noise
immunity, slope compensation (in FF mode only), and a shutdown function for externally
controlled burst-mode operation or remote ON/OFF control complete the equipment of this
device.
Doc ID 16610 Rev 1
5/48
5 Page 
L6566BH
4 Electrical characteristics
Electrical characteristics
(TJ = -25 to 125°C, VCC = 12, CO = 1 nF; MODE/SC = VREF, RT = 20 kΩ from OSC to GND,
unless otherwise specified).
Table 4. Electrical characteristics
Symbol
Parameter
Supply voltage
Vcc Operating range after turn-on
VccOn Turn-on threshold
VccOff Turn-off threshold
Hys Hysteresis
VZ Zener voltage
Supply current
Istart-up
Iq
Icc
Start-up current
Quiescent current
Operating supply current
Iqdis Quiescent current
High-voltage start-up generator
VHV
VHVstart
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Breakdown voltage
Start voltage
Vcc charge current
IHV, ON ON-state current
IHV, OFF OFF-state leakage current
VCCrestart Vcc restart voltage
Reference voltage
VREF Output voltage
VREF Total variation
IREF Short circuit current
Test condition
VCOMP > VCOMPL
VCOMP = VCOMPO
(1)
(1) VCOMP > VCOMPL
(1) VCOMP = VCOMPO
VCOMP > VCOMPL
Icc = 20 mA, IC disabled
Before turn-on, Vcc = 13 V
After turn-on, VZCD = VCS = 1 V
MODE/SC open
IC disabled (2)
IC latched off
IHV < 100 µA
IVcc < 100 µA
VHV > VHvstart, Vcc > 3 V
VHV > VHvstart, Vcc > 3 V
VHV > VHvstart, Vcc = 0
VHV = 400 V
Vcc falling
(1) IC latched off
(1) Disabled by
VCOMP < VCOMPOFF
(1) TJ = 25 °C; IREF = 1 mA
IREF = 1 to 5 mA,
Vcc = 10.6 to 23 V
VREF = 0
Min.
10.6
8
13
9.4
7.2
23
330
800
65
0.55
4.4
12.5
9.4
4.95
4.9
10
Typ.
14
10
7.6
4
25
200
2.6
4
440
80
0.85
5
13.5
10
5
Max.
23
23
15
10.6
8.0
27
250
2.8
4.6
2500
500
100
1
1.6
0.8
40
5.6
14.5
10.6
5.05
5.1
30
Unit
V
V
V
V
V
µA
mA
mA
µA
V
V
mA
mA
µA
V
V
V
mA
Doc ID 16610 Rev 1
11/48
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet L6566BH.PDF ] | |
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