PM6600 STMicroelectronics, PM6600 Datasheet - Page 31
PM6600
Manufacturer Part Number
PM6600
Description
IC LED DRIVR WHT BCKLT 24-VFQFPN
Manufacturer
STMicroelectronics
Type
Backlight, White LEDr
Datasheet
1.PM6600TR.pdf
(60 pages)
Specifications of PM6600
Topology
PWM, Step-Up (Boost)
Number Of Outputs
6
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
200kHz ~ 1MHz
Voltage - Supply
4.7 V ~ 28 V
Voltage - Output
36V
Mounting Type
Surface Mount
Package / Case
24-VFQFN, 24-VFQFPN
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
32mA
Internal Switch(s)
Yes
Number Of Segments
60
Operating Supply Voltage
4.7 V to 28 V
Maximum Power Dissipation
2.3 W
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
For Use With
497-8414 - BOARD EVAL BASED ON PM6600
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PM6600
Manufacturer:
FUJITSU
Quantity:
2 402
Company:
Part Number:
PM6600TR
Manufacturer:
ST
Quantity:
11 965
Company:
Part Number:
PM6600TR
Manufacturer:
st
Quantity:
5 145
PM6600
Figure 47. Poor phase margin (a) and properly damped (b) load transient responses
Equation 9
Once the output capacitor has been chosen, the R
Equation 10
Where G
The C
times lower than the loop bandwidth:
Equation 11
Where f
The close loop gain function (G
Equation 12
A simple technique to optimize different applications is to replace R
trimmer and adjust its value to properly damp the output transient response. Insufficient
damping will result in excessive ringing at the output and poor phase margin. Figures 5a and
5b give an example of compensation adjustment for a typical application.
COMP
Z
M
= f
= 2.7 S and g
U
capacitor is determined to place the frequency of the compensation zero 5
/ 5.
G
LOOP
EA
=
= 375 µS.
G
Δ
M
Doc ID 14248 Rev 7
V
LOOP
⋅
OUT
g
C
EA
R
COMP
) is thus given by equation 10:
=
COMP
⋅
⎛
⎜ ⎜
⎝
2
R
⋅ π
COMP
I
=
OUT
=
f
U
2
G
⋅ π
⋅
C
2
+
M
⋅ π
f
Z
⎛
⎜
⎜
⎝
sC
⋅
1
g
⋅
f
1
U
R
−
EA
COMP
COMP
1
⋅
COMP
V
V
C
⋅
IN
M
IN
_
_
can be calculated as:
⎞
⋅ ⎟ ⎟
⎠
MAX
MIN
RM
⎞
⎟
⎟
⎠
1
1
−
+
s
sRC
M
COMP
Operation description
L
2
R
with a 20 kΩ
31/60