LM3530UME-40/NOPB National Semiconductor, LM3530UME-40/NOPB Datasheet - Page 17

• Manufacturer Part Number: LM3530UME-40/NOPB
• Description: IC LED DRVR PROGRAM I2C 12USMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3530UME-40/NOPB

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 500kHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 12-UFBGA
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: Adjustable
• Led Driver Application: LED Backlighting, Portable Electronics
• No. Of Outputs: 1
• Output Current: 29.5mA
• Output Voltage: 40V
• Input Voltage: 2.7V To 5.5V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: LM3530UME-40TR

2.
Figure 9
Thresholds vary depending on the direction of the ALS input
voltage.
MINIMUM ZONE BOUNDARY SETTINGS
The actual minimum zone boundary setting is code 0x03.
Codes of 0x00, 0x01, and 0x02 are all mapped to code 0x03.
Table 1
the typical thresholds, and the high and low hysteresis values.
The remapping of codes 0x00 - 0x02 plus the additional 4mV
programmed into the Zone Boundary registers, and
V
If the last zone transition was from high to low then the
trip point (V
HYST
shows the: Zone Boundary codes 0x00 through 0x04,
details how the LM3530's ALS Input Zone Boundary
is typically 7mV.
TRIP
) will be V
ZONE_BOUNDARY
FIGURE 9. Zone Boundaries With Hysteresis
+ V
HYST
/2.
17
Referring to
termined from the direction of the previous ALS zone transi-
tion.
of offset voltage is necessary to prevent random offsets and
noise on the ALS inputs from creating threshold levels that
are below GND. This essentially guarantees that any Zone
Boundary threshold selected is achievable with positive ALS
voltages.
Figure
9, each numbered trip point shown is de-
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