ISL976787IBZ-T 查看數據表（PDF） - Intersil

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ISL976787IBZ-T

4-Channel LED Driver with Phase Shift Control and 10-Bit Dimming Resolution

Intersil 

ISL97687

switched off and stay off until power or EN is cycled. For the

extensive fault protection conditions, please refer to Figure 26

and Table 2.

VIN OVP

If VIN exceeds 35V, the part will be shut down until power or EN is

cycled. At this point, all digital settings will be reset to their

default states.

Shutdown

When the EN pin is low the entire chip is shut down to give close

to zero shutdown current. The digital interfaces will not be active

during this time. The EN can be high before VIN.

COMPENSATION

The ISL97687 boost regulator uses a current mode control

architecture, with an external compensation network connected

to the COMP pin. The component values shown in Figure 25

should be used. The network comprises a 47pF capacitor from

COMP to AGND, in parallel with a series RC of 25kΩ and 2.2nF,

also from COMP to AGND.

COMP

2.2nF

25k

47pF

FIGURE 25. COMPENSATION NETWORK

FAULT

IMAX ILIMIT LOGIC

O/P

SHORT

FET

DRIVER

LX

OVP

VSC

VOUT

CH1

VSET/2

REG

THRM

SHDN

OTP

VSET +

-

PWM1/OC1/SC1

PWM

CONTROL

REF

T2

TEMP

SENSOR

T1

Q1 VSET +

-

PWM4/OC4/SC4

CH4

Q4

FIGURE 26. SIMPLIFIED FAULT PROTECTIONS

15

FN7714.0

September 15, 2011

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