CS1631-FSZ datasheet(34/56 Pages) APEX

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CS1630/31

DS954F2

6.12 Configuration 7 (Config7) – Address 39

6.13 Configuration 8 (Config8) – Address 40

654

PROBE

PRCNT3

PRCNT2

PRCNT1

PRCNT0

Number

Name

Description

[7]

PROBE

Configures the automated TRES probe operation that measures the resonant

frequency on the drain of the second stage FET using the reflected voltage

applied to the FBAUX pin for improved valley switching performance.

0 = Disables TRES probe

1 = Enables TRES probe

[6:3]

PRCNT[3:0]

When PROBE=‘1’, sets the number of switching cycles TTCycles between TRES

probe measurements.

When PROBE=‘0’, sets the time for a quarter period of the resonant period

TRES.

[2:0]

Reserved

654

RSHIFT3

RSHIFT2

RSHIFT1

RSHIFT0

CH1_ZCD2

CH1_ZCD1

CH1_ZCD0

CH1CURMSB

Number

Name

Description

[7:4]

RSHIFT[3:0]

Sets the number of right shifts performed on the second stage PID integrator

value to generate a 10-bit threshold value for the peak control comparator. For

peak rectify mode, the threshold is calculated by a right shift of the integrator

value. If RSHIFT[3:0] is set to 12, the 24-bit integrator is shifted right 12 times

and the remaining bits represent the threshold value provided to the peak con-

trol comparator.

[3:1]

CH1_ZCD[2:0]

Sets fixed time delay TCH1ZCD(Delay) to account for the delay of the second

stage zero-current detection (ZCD) comparator during channel 1 switching

cycles when the voltage applied to the FBAUX pin falls below the 250mV ZCD

comparator threshold. Configuring TCH1ZCD(Delay) is essential for good quasi-

resonant (valley switching) performance. The value is an unsigned integer in

the range of 0

value7. The delay is defined by:

[0]

CH1CURMSB

Most significant bit for the CH1CUR register (see "Channel 1 Output Current

(CH1CUR) – Address 41" on page 35).

TTCycles

16 P

 RCNT[3:0]

 15

TRES

--------------

2 PRCNT[3:0] 50ns



TCH1ZCD Delay



CH1_ZCD

[2:0] 50ns



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