UP9504 datasheet(12/41 Pages) UPI | Phase Driver Embedded PWM Controller

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UP9504 Datasheet(PDF) 12 Page - uPI Group Inc.

Part #	UP9504

Description	Phase Driver Embedded PWM Controller

PDF	41 Pages

Scroll/Zoom	100%

Manufacturer	UPI [uPI Group Inc.]

Direct Link	http://www.ubiq-semi.com/

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uP9504

12

uP9504-DS-F0000, May 2017

www.upi-semi.com

Functional Description

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Table 4. Operation Phase Number Setting

PWM On-Time Setting

The PWM on-time is set by an external resistor R

TON

connected between TONSET pin and GND. The controller

senses VINSEN voltage to obtain input voltage information

for PWM on-time calculation. Both the VDD rail and VDDA

rail share the same PWM on-time setting. The PWM on

time can be calculated as below equation.

100

×

×

⎟

⎠

⎞

⎜

⎝

⎛

=

TON

IN

OUT

ON

R

V

V

T

where T

ON is in ns, RTON is in kΩ.

Table 5 lists the switching frequency and the recommended

resistor R

TON value (with condition: VIN = 12V, VOUT = 1.2V).

For example, given V

IN = 12V, VOUT = 1.2V, RTON = 49.9kΩ,

T

ON is about 500ns by above equation. The PWM frequency

is about 200kHz. Note that the resistance value of R

TON

value must be greater than 10k

Ω to ensure the PWM on

time calculation circuit in normal operation.

Table 5. Switching Frequency and Resistor R

TON

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