EVL6562A-LED STMicroelectronics, EVL6562A-LED Datasheet - Page 18

• Manufacturer Part Number: EVL6562A-LED
• Description: EVALUATION MODULE L6562A
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVL6562A-LED

• Current - Output / Channel: 350mA
• Outputs And Type: 1, Non-Isolated
• Features: Dimmable
• Voltage - Input: 48V
• Utilized Ic / Part: L6562A
• Input Voltage: 48 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L6562A
• Other names: 497-10420

2.6
18/32
Circuit description
And then:
Equation 49
On the demonstration board several measures have been taken with Vin = 48 V, and
Rb = 1 kΩ.
Figure 13
with Ra (actually R17 + R20) as a parameter.
Figure 13. I_Led/VLed
Shutdown/dimming
The D_Dim input (pin 1 of the J1 connector) has a dual function.
●
●
Forcing it low, or leaving it floating, enables the controller's normal activity (current sink),
while pulling it high (> 2.7 V) causes the module to shut down. Therefore, this input can be
used to switch the load on and off.
Figure 14
and an equivalent output voltage (VLed) of 20 V. In these conditions, the rise and fall times
of the load current are lower than 10 µS.
Applying a square wave to this pin forces the module to 'work and stop' at the input signal
frequency; in this way the average load current can be modified by simply changing the duty
cycle of the PWM control.
Supposing a dimming frequency of 200 Hz is used, and taking into account the 10 µS of
rise/fall time of the LED current, we can estimate the minimum dimming as
(20 uS)*(200 Hz) = 0.4%.
Figure 16
1% and 99%.
Module enable
Digital (PWM) dimming
,
is the plot of the LED current as a function of the voltage on the LED string (VLed)
and
17
,
Figure 15
18
,
19
, and
highlight the turn-on and turn-off with an input voltage (Vin) of 48 V
20
show the LED current for different dimming factors between
Doc ID 15679 Rev 1
⎛
⎜
⎝
Ra
Rb
⎞
⎟
⎠
=
(
. 0
(
. 1
985
68
*
*
10
10
−
−
4
6
)
)
=
170
AN2983