STEVAL-ISA056V1 STMicroelectronics, STEVAL-ISA056V1 Datasheet - Page 50

• Manufacturer Part Number: STEVAL-ISA056V1
• Description: BOARD EVAL BASED ON PM6600
• Manufacturer: STMicroelectronics
• Type: PWM Controllersr

Specifications of STEVAL-ISA056V1

• Design Resources: STEVAL-ISA056V1 Gerber Files STEVAL-ISA056V1 Schematic STEVAL-ISA056V1 Bill of Material
• Current - Output / Channel: 30mA
• Outputs And Type: 6, Non-Isolated
• Voltage - Output: 36 V
• Features: Dimmable
• Voltage - Input: 4.5 ~ 28V
• Utilized Ic / Part: PM6600
• Input Voltage: 4.5 V to 28 V
• Output Voltage: 36 V
• Product: Power Management Modules
• Core Chip: PM6600
• Topology: Boost
• No. Of Outputs: 1
• Dimming Control Type: PWM
• Mcu Supported Families: PM6600
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PM6600
• Other names: 497-8414

Application note
50/60
Equation 25
whereas R
Equation 26
and
Equation 27
The output voltage in the above calculations is considered as the maximum value (LED with
the maximum forward voltage connected to the leading generator):
Equation 28
Figure 57. Inductor current in DCM operation
Considering the input voltage range, the lower L
the condition to assure the DCM operation becomes:
Equation 29
An inductor value of 6.8 µH could be a suitable value, considering also a margin from the
boundary condition.
I
I
L, p eak
L, p eak
I
I
L
L
T
T
0
ON
ON
is:
T
T
SW
SW
T
T
OF F
OF F
= 1/F
= 1/F
D
V
=
OUT
1
SW
SW
−
Doc ID 14248 Rev 7
,
max
V
V
OUT
I
L
IN
OUT
=
<
R
8
=
L
0
⋅
=
B
V
⎧
⎨
⎩
=
(
, F
. 0
6
V
. 0
V
I
LEDs
⋅
IN
52
OUT
OUT
I
68
ROW
,
min
,
max
)
@
=
B
@
=
=
250
will be at the lower input voltage. Hence
13
+
120
V
400
2 .
V
IN
Ω
IN
mA
μ
,
max
,
mV
H
min
=
=
=
14
9
30
6 .
4 .
V
V
V
PM6600
t
t