ADP 5052 CH1 and CH2 latch-off when connected to load


I am using ADP5052 to power altera cyclone v gx, 


1) CH1 and CH2 does not turn ON when switching frequency is less the 850KHz. (CH3 and CH4 workes without any problem)

2) switching frequency resistor value changed to 24.3K, CH1 and CH2 turned on but the output expected voltage is not met.

3) when i connect CH1 and CH2 to a small load i.e 50mA, the regulators gets latched off and the output is disabled.  

i tried changing the compensation RC values and also set the PMIC to Automatic PWM/PSM Modes but no luck. please help.

Thank You,

Nithish A N

Added SCH
[edited by: nithish at 3:34 AM (GMT -4) on 16 Sep 2018]
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