IR3598 datasheet(17/20 Pages) IRF

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Dual/Doubler Interleaved MOSFET Driver

October 27, 2011 | FINAL | V1.09

IR3598

FREQUENCY RANGE

The IR3598 is designed to operate over a wide input and

output frequency range. When operating in Dual Mode,

the input and output frequencies are identical. When

operating in Doubler mode, the input frequency at the

PWM1 input is twice the output frequency.

The lower limit of the output frequency range is dictated

by the size of the BOOT capacitor, which must provide

charge to the HIGH side MOSFET during the entire on time.

The upper limit of frequency is determined by thermal

limitations as well as pulse width limitations. The IR3598

is designed to operate with input frequencies as low as

300kHz and output frequencies in excess of 1MHz.

ENABLE

When enable is low there are no High Gate or Low Gate

outputs, both HGx and LGx are held low so that no

MOSFET switching occurs. When enable goes high from

a low, the driver passes the appropriate PWM signal as

described previously in this datasheet.

DOUBLER MODE REACTION TO TRI-STATE

PWM INPUT

In Doubler mode, anytime there is a tri-state on the master

PWM1, all outputs (HGx and LGx) are tri-stated. When the

PWM1 transitions from a tri-state to a high and then from

a high to a low, only the 0deg phase operates. This allows

the VR to operate properly in PS2 mode and during load

releases.

Once the PWM1 sees a transition from a low to a high,

the doubler function starts again, with output on both sets

of HGx and LGx. DUAL Mode Reaction to Tri-State

PWM input

Anytime there is a tri-state on the PWMx, all outputs

(HGx and LGx) associated with that PWMx are low.

USING A DUAL MODE DRIVER AS

A SINGLE DRIVER

To use the Dual Mode driver as a single simply leave the

unused input to float. With PWM floating, both HGx and

LGx will be off. Alternatively you can ground the input

which will sink 1 mAdc to ground. This will cause HGx to be

off and LGx to be on.

IR3598 Datasheet(PDF) 17 Page - International Rectifier

IR3598 Datasheet(HTML) 17 Page - International Rectifier

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