STEVAL-ILB008V1 STMicroelectronics, STEVAL-ILB008V1 Datasheet - Page 17

BOARD EVAL BALLAST FOR L6585DE

STEVAL-ILB008V1

Manufacturer Part Number
STEVAL-ILB008V1
Description
BOARD EVAL BALLAST FOR L6585DE
Manufacturer
STMicroelectronics
Type
Power Factor Correctionr

Specifications of STEVAL-ILB008V1

Main Purpose
Lighting, Ballast Control
Embedded
No
Utilized Ic / Part
L6585DE
Primary Attributes
4 x 18w, T8 Lamps
Secondary Attributes
Preheating Ignition
Input Voltage
90 V to 265 V
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
L6585DE
Other names
497-10544
L6585DE
5.2.4
5.2.5
5.2.6
5.2.7
Over-voltage protection
Two different over-voltage protections can be detected: dynamic over-voltage, usually due to
fast load transition and static over-voltage, due to an excessive input voltage.
Disabling the L6585DE
the CTR pin can be used to shut down the IC without mains disconnection. When CTR is
pulled below 0.75 V, the IC is stopped and the internal logic is reset. When CTR is released,
the IC starts with a new preheating sequence. This function is available only if the IC is not
latched due to a fault protection intervention.
Feedback disconnection protection
Very fast output voltage surges may damage the upper resistors of the voltage divider
feeding the INV pin, causing a feedback disconnection. In this case, the E/A saturates high
and the PFC gate drive turns on the MOSFET for a long time (the current sense threshold
assumes its maximum value equal to 1 V) and the choke may saturate, destroying the
MOSFET.
The output voltage increases very fast and may reach very high value even if OVP is
triggered.
Feedback disconnection protection is then activated if V
voltage protection is triggered.
PFC over-current protection
The PFC MOSFET over-current can occur in cases of PFC choke saturation or in cases of
surge from the input, due to the breakdown of the MOSFET body diode. The latter case is
observed together with an over-voltage of the PFC output.
In both cases, the PFC stage is stopped, whereas the HB stage continues switching. The
protection is not latched: once the PFCCS falls below 1.7 V, the PFC driver restarts.
Dynamic OVP
The CTR pin is connected to high voltage rail through a voltage divider. If the voltage at
this pin is above 3.4 V, the PFC gate driver is stopped until the voltage returns below
the threshold. This limits the risk of choke saturation and MOSFET's damage.
Static OVP
A steady over-voltage may cause abnormal behavior in both the PFC (e.g. because
input voltage is higher than PFC output voltage) and the ballast (e.g. overheating, lamp
over-current, capacitive mode operating point). A steady over-voltage causes a slow
transition of the COMP pin towards the low saturation (around 2.25 V). This fact is
considered by the L6585DE as a static over-voltage event and a Tch cycle is started.
After this cycle, if the COMP pin is saturated low the IC is latched in low consumption
mode.
INV
< 1.2 V and dynamic over-
Application information
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