PM6600 STMicroelectronics, PM6600 Datasheet - Page 37

• Manufacturer Part Number: PM6600
• Description: IC LED DRIVR WHT BCKLT 24-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Backlight, White LEDr

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

PM6600
8
8.1
Backlight driver section
Current generators
The PM6600 is a LEDs driver with six channels (ROWs); each ROW is able to drive multiple
LEDs in series (max. 40 V) and to sink up to 32 mA maximum current, allowing to manage
different kinds of LEDs.
The LEDs current can be set by connecting an external resistor (R
pin and ground. The voltage across the RILIM pin is internally set to 1.2 V and the ROWs
current is proportional to the RILIM current according to the following equation:
Equation 18
Where K
The current accuracy between the ROWs of more than one device is, consequently:
Equation 19
In the table below there are the maximum, typical and minimum I
R
Table 7.
The maximum current mismatch between the ROWs of one device is
± 2% @ I
RILIM
:
47.0 kΩ
49.9 kΩ
51.0 kΩ
R
R
ROWx
RILIM
= 998 ± 21 V (± 2.1%).
I
ROW
= 20 mA, according to the formula:
values versus R
Δ
Δ
I
I
ROW
ROW
I
ROW
,
,
MAX
MIN
20.79 mA
19.58 mA
19.16 mA
Doc ID 14248 Rev 7
@ KR = 977
=
=
I
I
ROW
ROW
RILIM
_
I
_
ROWx
K
K
R
I
R
ROW
=
I
=
ROW
977
1019
=
_
−
_
K
R
−
K
R
I
K
RILIM
ROW
R
=
I
I
998
ROW
=
R
ROW
998
_
21.68 mA
20.00 mA
19.57 mA
K
_
@ KR = 998
R
K
=
R
998
=
998
≥
≤
−
+
2
ROW
1 .
2
Backlight driver section
RILIM
1 .
%
%
values versus the
) between the RILIM
I
ROW
21.68 mA
20.42 mA
19.98 mA
@ KR = 1019
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