LM3532TMX-40ANOPB National Semiconductor Corporation, LM3532TMX-40ANOPB Datasheet - Page 24

• Manufacturer Part Number: LM3532TMX-40ANOPB
• Description: High Efficiency White Led Driver With Programmable Ambient Light Sensing Capability And I2c-compatible Interface
• Manufacturer: National Semiconductor Corporation

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Output Voltage Limited
When the LM3532's output voltage (highest voltage LED
string + 400 mV headroom voltage) reaches 40V, the OVP
threshold is hit, and the NFET turns off and remains off until
the output voltage drops 1V below the OVP threshold. Once
VOUT falls below this hysteresis, the boost converter will turn
FIGURE 12. Maximum Output Power (22 µH)
FIGURE 13. Maximum Output Power (10 µH)
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on again. In high output voltage situations the LM3532 will
begin to regulate the output voltage to the VOVP level instead
of the current sink headroom voltage. This can result in a loss
of headroom voltage across the feedback enabled current
sinks resulting in the LED current dropping below its pro-
grammed level.
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