PM6600 STMicroelectronics, PM6600 Datasheet - Page 57

• 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
C.3
C.4
In case of the DIM pin, we suggest to use a function generator. In case of using a power
supply, it is preferable to use 3.3 V and the same RC filter as the EN pin.
For what concerns the VIN pin, it is already filtered by the input capacitors.
ROW pins protection
Figure 61. ROW pins protection
In the production line, the most common way to test the LED Driver PCB is to connect it to
the LED Board using a Dummy LED Driver Board. The Dummy Board is connected to the
LED Driver PCB by using metal needles, while it is directly connected to the LED Board.
The metal needles contacts, in case the board is not turned off while mounting/removing,
can provoke a charge injection into the ROWs pins of the device, thus damaging it. The
external capacitors, chosen in the range 100 pF to 470 pF, limits the voltage spike on the
ROWs pins, avoiding the charge injection.
In order to limit the EOS induced stress on ROWx pins, 1 nF capacitor can be used. In this
working conditions, please consider that the minimum on time of the current generator is
increased, due to the external capacitors that reduce the current turn-on/off slew-rate.
The capacitors connected between the ROWs pins and SGND are also useful in case of
ESD discharge on the ROWs pins bigger than the device specifications.
Debug and measurements test points
The tests points used to check the functionality of the board during PCB assembly and/or in
the production line can be dangerous in case of not-protected ESD environment or in case
overvoltage or overcurrent, exceeding the absolute maximum ratings (AMR) of the device,
hits them.
The critical pins involved are the ROWx pins. In case a testing machine is connected with
needles on the ROWx pins test points, it can be possible that an ESD, exceeding AMR,
occurs or it is possible that the testing machine creates and overvoltage/overcharge
condition in the pin. In this case the device will result damaged.
The corrective action is to add, for every ROWx pin, 100 pF capacitor vs GND and to avoid
the test points on the ROWx pins if not strictly necessary.
R OW6
R OW5
R OW4
R OW3
R OW2
R OW1
Doc ID 14248 Rev 7
C row 1
Crowx = 100pF to 470pF
C row2
C row3
C row 4
C row5
C row6
Application suggestions
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