STEVAL-ISA056V1 STMicroelectronics, STEVAL-ISA056V1 Datasheet - Page 32

BOARD EVAL BASED ON PM6600

STEVAL-ISA056V1

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

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
STEVAL-ISA056V1
Manufacturer:
STMicroelectronics
Quantity:
1
Operation description
7.4.2
32/60
Figure 48. Load transient response measurement set-up
Slope compensation
The constant frequency, peak current-mode topology has the advantage of very easy loop
compensation with output ceramic capacitors (reduced cost and size of the application) and
fast transient response. In addition, the intrinsic peak-current measurement simplifies the
current limit protection, avoiding undesired saturation of the inductor.
On the other side, this topology has a drawback: there is inherent open loop instability when
operating with a duty-ratio greater than 0.5. This phenomenon is known as “sub-harmonic
instability” and can be avoided by adding an external ramp to the one coming from the
sensed current. This compensating technique, based on the additional ramp, is called
“Slope Compensation”. In figure 11, where the switching duty-cycle is higher than 0.5, the
small perturbation ΔIL dies away in subsequent cycles thanks to the slope compensation
and the system reverts to a stable situation.
Figure 49. Main loop and current loop diagram
V
IN
= 6V
+5V
C
IN
COMP
LDO5
BILIM
RILIM
SS
COMP
SGND
V
6.8μH
IN
PM6600
Doc ID 14248 Rev 7
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
g
PWM
m
LX
0.4V
Up to 10 WLEDs per row
Minimum voltage drop
4.7μF
MLCC
V
BST=30÷36V
selector
ROWx
R
PM6600
L
500Hz
RILIM
SGND
=
50mA
V
BST

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