LM3559_16 datasheet(10/50 Pages) TI1

Part #	LM3559

Description	Synchronous Boost Flash Driver

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Manufacturer	TI1 [Texas Instruments]

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LM3559

SNVS624B – JUNE 2011 – REVISED JUNE 2016

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Typical Characteristics (continued)

Unless otherwise specified: VIN = 3.6 V, COUT = 10 µF, CIN = 10 µF, L = 1 µH (TOKO FDSD0312-1R0, RL = 43 mΩ),

Figure 43.

Figure 19. VIN Flash Monitor Operation

Figure 20. NTC-Mode Operation

Figure 21. AET-Mode Operation

Figure 22. HWEN Operation Device Enabled in Flash Mode

Figure 23. TX1 Interrupt (Force Torch)

TX2 Active High

Figure 24. TX2 Interrupt (Forced Shutdown)

(1)

The typical curve for current limit is measured in closed loop using Figure 43, and increasing IOUT until the peak

inductor current stops increasing. The value given in Electrical Characteristics is measured open loop and is found by

forcing current into SW until the current limit comparator threshold is reached. Closed loop data appears higher due to

the delay between the comparator trip point and the NFET turning off. This delay allows the closed loop inductor

current to ramp higher after the trip point by approximately 20 ns × VIN/L.

(2)

The typical curve for overvoltage protection (OVP) is measured in closed loop using Figure 43 . The OVP value is

found by forcing an open circuit in the LED1 and LED2 path and recording the peak value of VOUT. The value given in

Electrical Characteristics is found in an open loop configuration by ramping the voltage at OUT until the OVP

comparator trips. The closed loop data can appear higher due to the stored energy in the inductor being dumped into

the output capacitor after the OVP comparator trips. Worst case is an open circuit condition where the output voltage

can continue to rise after the OVP comparator trips by approximately IIN × sqrt(L/COUT).

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