RT9602CS datasheet(5/8 Pages) RICHTEK

5 / 8 page

Preliminary

RT9602

DS9602-00 January 2002

www.richtek-ic.com.tw

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Output

Upper Drive Source

RUGATE VVCC = 12V, VPVCC = 12V

1.5

Ω

Upper Drive Sink

RUGATE VVCC = 12V, VPVCC = 12V

1.45

Ω

Lower Drive Source

RLGATE VVCC = 12V, VPVCC = 12V

1.6

Ω

Lower Drive Sink

RLGATE VVCC = VPVCC = 12V

0.75

Ω

Operation Descriptions

The RT9602 has power on protection function which

held UGATE and LGATE low before VCC up across

the rising threshold voltage. After the initialization, the

PWM signal takes the control. The rising PWM signal

first forces the LGATE signal turns low then UGATE

signal is allowed to go high just after a non-

overlapping time to avoid shoot-through current. The

falling of PWM signal first forces UGATE to go low.

When

UGATE

and

PHASE

signal

reach

predetermined low level, LGATE signal is allowed to

turn high. The non-overlapping function is also

presented between UGATE and LGATE signal

transient.

The PWM signal is recognized as high if above rising

threshold and as low if below falling threshold. Any

signal level in this window is considered as tri-state,

which causes turn-off of both high side and low-side

MOSFET. When PWM input is floating (not

connected), internal divider will pull the PWM to 1.9V

to give the controller a recognizable level. The

maximum sink/source capability of internal PWM

reference is 60

µA.

The PVCC pin provides flexibility of both high side

and low side MOSFET gate drive voltages. If 8V, for

example, is applied to PVCC, then high side

MOSFET gate drive is 8V-1.5V(approximately,

internal diode plus series resistance voltage drop).

The low side gate drive voltage is exactly 8V.

The RT9602 implements a power on over-voltage

protection function. If the PHASE voltage exceeds

1.5V at power on, the LGATE would be turn on to pull

the PHASE low until the PHASE voltage goes below

1.5V. Such function can protect the CPU from

damage by some short condition happened before

power on, which is sometimes encountered in the

M/B manufacturing line.

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