NCP5008DMR2(2003) データシートの表示（PDF） - ON Semiconductor

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NCP5008DMR2
(Rev.:2003)

Backlight LED Boost Driver

ON Semiconductor 

NCP5008, NCP5009

Operating Description

tCLKmin

90%

50%

10%

tf

tr

Figure 17. Digital Timing Definitions

Output

Vbat

ON

OFF

0.30* Vbat

0.70* Vbat Vbat

Input

Figure 18. Typical Schmitt Trigger Characteristic

Input Schmitt Triggers

All the Logic Input pins have built−in Schmitt trigger

circuits to prevent the NCP5008/NCP5009 against

uncontrolled operation. The typical dynamic characteristics

of the related pins are depicted in Figure 18.

The output signal is guaranteed to go High when the

input voltage is above 0.70*Vbat, and will go Low when the

input voltage is below 0.30*Vbat.

Local Mode

When the system operate in a Local Mode (Pin 6,

/LOCAL=Low), the output current depends solely upon

the current drawn pin 1. The clock signal is irrelevant and

the output current is derived by equation Iout = Iref * k, the

internal constant k being equal to 746.

ESD Protection

The NCP5008/NCP5009 includes silicon devices to

protect the pins against the ESD spikes voltages. To cope

with the different ESD voltages developed in the

applications, the built−in structures have been designed to

handle $2.0 kV in Human Body Model (HBM) and

$200 V in Machine Model (MM) and on each pin.

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