ADP1823 Datasheet, PDF (28/32 Pages) Analog Devices – Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking

ADP1823
Type III Compensation
K
=
⎜⎜⎝⎛
tan
⎜⎛
⎝
φ_B
2
+ 45°⎟⎠⎞⎟⎟⎠⎞²
f_Z
=
f_CO
K
f_P = f_CO K
Select RTOP between 1 kΩ and 10 kΩ. A good starting value is 2 kΩ.
R _BOT
=
0.6 V × R_TOP
V_OUT − 0.6 V
C _FF
=
1
2 π R_TOP f_Z
R_FF
=
1
2 π C_FF f_P
Z _FF
=¹
2 π C _FF f_CO
+ R_FF
A_COMP = 0 dB − A_MOD − A_FILTER
( ) ^{⎜⎛ ACOMP ⎟⎞}
R_Z = R_TOP || Z _FF × 10 ^{⎝ 20 âŽ} 
C_I
=
1
2π R_Zf_Z
C _HF
=
1
2π R_Zf_P
Calculations
(85)
(86)
(87)
(88)
(89)
(90)
(91)
(92)
(93)
(94)
(95)
Rev. A | Page 28 of 32