LM3530 datasheet(10/50 Pages) TI1

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LM3530

SNVS606L – JUNE 2009 – REVISED DECEMBER 2014

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Typical Characteristics (continued)

VIN = 3.6 V, LEDs are OVSRWAC1R6 from OPTEK Technology, COUT = 1 µF, CIN = 1 µF, L = TDK VLF5012ST-100M1R0,

(RL = 0.24 Ω), ILED = 19 mA, TA = 25°C, unless otherwise specified.

Channel 2: SDA (5V/div)

Time Base (4s/div)

Channel 1: IIN (200mA/div)

Time Base (2ms/div)

Channel 3: ILED (10mA/div)

Channel 3: VOUT (20V/div)

Ramp Rate = 8µs/Step

65.538ms/Step Up And Down

Channel 4 (10mA/div)

ILED = 19mA

L = 22 µH

VIN = 3.6V

Figure 21. Ramp Rate (Exponential)

Figure 22. Start-up Plot

Channel 2: PWM (5V/div)

Time Base (2ms/div)

Channel 1: VIN (500mV/div)

Time Base (400µs/div)

Channel 4: ILED (5mA/div)

ILED Full Scale = 19 mA

Channel 2: VOUT (500mV/div)

L = 22 µH

DPWM From 30% To 70%

FPWM = 5 kHz

Channel 3: ILED (500µA/div)

ILED = 19 mA

VIN From 3.6 V To 3.2 V

Figure 24. ILED Response To Step Change In PWM Duty

Figure 23. Line Step Response

Cycle

Closed Loop

L = 22 µH

The value for current limit given in the Electrical Characteristics is measured in an open loop test by forcing current into SW until the

current limit comparator threshold is reached. The typical curve for current limit is measured in closed loop using the typical application

circuit by increasing IOUT until the peak inductor current stops increasing. 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 100 ns × VIN/L.

Figure 25. Current Limit vs VIN

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