PM6600 STMicroelectronics, PM6600 Datasheet - Page 58

• 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

Application suggestions
C.5
58/60
Inductor choice
The inductor selection should be done according to the datasheet guidelines.
The choice of the inductor value is explained in the
page 49
Moreover, the inductor has to be properly dimensioned also according to the boost current
limit,
When using low current rated inductors, the risk is to have the inductor saturating during the
soft-start sequence or even during operating mode.
In case of saturation during the soft-start, the device can go into OVP and latch off. If the
inductor is hard saturating, both in soft-start and in operating mode, the risk is to have the
LX pin exceed the absolute maximum ratings. In this condition, the device will switch using
the minimum on time of the boost controller, to avoid the output overcharge and to preserve
the leds from issues. If the saturation is prolonged, the inductor is behaving as a wire (the
inductance value will be extremely reduced). This will create inductor damage and/or device
damage because of overstress condition.
Section B.4.8: Boost current limit on page 53
.
Doc ID 14248 Rev 7
Section B.4.3: Inductor choice on
PM6600