ISL97671IRZ-EVALZ【PDF 10/27 页】BOARD EVALUATION FOR ISL97671

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ISL97671

Typical Performance Curves

(Continued)

FIGURE 16. LINE REGULATION WITH V IN CHANGE FROM 26V TO 6V

FOR 6P12S AT 20mA/CHANNEL

FIGURE 18. LOAD REGULATION WITH I LED CHANGE FROM 100% TO

0% PWM DIMMING, V IN = 12V, 6P12S AT

20mA/CHANNEL

Theory of Operation

PWM Boost Converter

The current mode PWM boost converter produces the minimal

voltage needed to enable the LED stack with the highest forward

voltage drop to run at the programmed current. The ISL97671

employs current mode control boost architecture that has a fast

current sense loop and a slow voltage feedback loop. Such

architecture achieves a fast transient response that is essential

for the notebook backlight application where the power can be a

series of drained batteries or instantly change to an AC/DC

adapter without rendering a noticeably visual nuisance. The

FIGURE 17. LOAD REGULATION WITH I LED CHANGE FROM 0% TO

100% PWM DIMMING, V IN = 12V, 6P12S AT

20mA/CHANNEL

FIGURE 19. ISL97671 SHUTS DOWN AND STOPS SWITCHING ~

30ms AFTER EN GOES LOW

Enable

The EN pin is used to enable or disable the ISL97671 operation. It is

a high voltage pin that can be tied directly to V IN up to 26.5V if the

system lacks of I/O for enable signal.

OVP and V OUT Requirement

The Overvoltage Protection (OVP) pin has a function of setting the

overvoltage trip level as well as limiting the V OUT regulation

range.

The ISL97671 OVP threshold is set by R UPPER and R LOWER as

shown in Equation 1:

number of LEDs that can be driven by ISL97671 depends on the

type of LED chosen in the application. The ISL97671 is capable of

V OUT_OVP = 1.21V × ( R UPPER + R LOWER ) ? R LOWER

(EQ. 1)

boosting up to 45V and drive 6 channels of LEDs.

10

V OUT can only regulate between 64% and 100% of the V OUT _ OVP

such that:

Allowable V OUT = 64% to 100% of V OUT _ OVP

FN7631.3

August 14, 2012

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