XR79106 Datasheet, PDF (13/19 Pages) Exar Corporation – 22V, 6A Synchronous Step-Down

RON =
VI2N.7×81x.0160_-x₁₀f × Eff.
VIN × [tON – (2.5 × 10^-8)]
RON = _{(IOCP2.+78(0x.510×-1∆0 IL))}
RLIM =
VOIULITM
+ 0.16kΩ
A_Prp_op_grli_ac_ma_mti_io_nn_gs_ttthOOI_Ne^Nn^R=_Of^=Oo_uNVr^V_tIm⁼_p^INN_u×a^×_t¹t^.1_V¹⁰i^V..o⁶⁰_o^O0V66R_ln^UxO_t^DxT_a^{xUf S}(_g^×fTfC_×e^×E(o_2fEEf.f.n^{f7ff..8–}ti_×n^[(21u^.05e_-1^×d₀₎ ¹)^{0-8) × VIN]}
Use an external voltage divider as shown in Figure 27
to
program
the_RRRo_OOFu_NBNt₁p_R==Lu_=It_M1R1v_..F0=o_0B6l₆t_V2Va_xOxO(×gIUfOUfe_×TC×TPV_{VEE0((O2f+O2f.ff6..U..URI77(VLT08DT–8I–M.}._{S5××[–[((×22111..050}∆_5--1×1I×_{0L0)))1)100-+}-88₎₎
× VIN]
0.16kΩ
× VIN]
W_Prh_oe_gr_re_aR_mFmB2inh_ga_Rts_LhICMa_eSn_S=So_o=m_(f^(ItI_tOSi^O_-n_CSS^Ca_PPt×l_a++v_ra_tRI((1L00l_Du_{I0.M.56S5µ}e_VA××o_∆f^∆2_IILLk₎₎₎Ω⁾ ._{+ 0.16kΩ}
π ^{pofPorflloalotgcS}_wer^{Sai,namgccateahlqcpeuuaslacaoR}_titti^LfeootI-M_nr^{CsRt:FCth=FaFeSBr=t1S.r=eI}2^bnqe×R^{uotFwirBrdee2×RIeLed×DrIRnMSFtco1BtahV01ppOe.6xarUoVScT5giSt}x^ra–af^na_L^+m1c_C^{n0eda.1AC6skoGSΩfSNt-sDftraoprmtintsitmhteeo}
RFB1fL=CCR=SFSB=22t×Sx ^Sπ^×Vx0O.√_{6U1V10LT0.x6µ}–^VACO1UT
π ^{π FpCThehaaeelcsdfuee-}_l^F_ae^o_tdme^r-fwaCorar_F^gwr_F^{inRdafFrrCCBdowS1R}_m^acShFp=aeF=_t^apC_h^Rn=cFat_e^FSFicBtS2_fui^o2=_otsox×^r_l^×_lir²_on^(CC_wg^×x101FVF_i^00f._n^OFF6.µ^cx6_g^U)V×A^ieVsCT_er^RFauq_FF^–ms1_u^Be1_a^1icdtx_iot^{5oonxu:stefpLtCutht ecnaepcaecsitsoarrsy.}
CSS =fLtSCS=×
CFF = _{2 × π}
10µA
20x.6π^V1x
× RFB1
1
√L
x5
x
x
COUT
fLC
Wcahlceurleatefd_LCf,romth:e^CfLFCFo⁼⁼u_Rt_Fp_2Fu_×2=t _xπ2f_π×il_xt_xe_Rπ√r_F11xBL11d_fxo_xxCu_C5Ob_FUxFle_TfL-p_Cole frequency is
fLC =
1
2 x π x √ L x COUT
YdAsheootlueouralmdmdibnuseestetptpheuerstfeeoesf_Rr^R_fmteFFm_FcF_eat=adn⁼_ivndae2u_2/nofcxxadra_πc_πpiatfxua_x11nrfclfeeo_xixtrcoaC’_{CespnFFsFcFsfeDraeCcrqyourCredeFnesFcrpaycotainnrnedgsibnpecgouantrodsvejVeusOsttUeetsTdo.t}
in order to get a critically damped transient load response.
In certain conditions an alternate compensation scheme
may need to be employed using ripple injection from
the inductor. Those components; RR, CR, and CAC
are shown in Figure 27. An application note is
being developed to provide more information about this
compensation scheme.
CSS = tSS ×
10µA
0.6V
XR79106
CFF
=
2
×
π
×
1
RFB1
x
5
x
fLC
π _h^FRieF_g^eF_h,^d-F_finr^o_e^r_q^wcuoeannrjd_cuyn^Rcetpisof_o^iLns_l^C_e^to=wr_ait⁽_nh^R2_d^Fx^FC)_a^F_dx^F_d,√¹_sL^fux^ngC^ca_O^tii_UnoT^{nsmasrigminilarto}
to a
the
frequency response. Calculate R_FF from:
RFF
=
2
x
π
1
xf
x
CFF
Where f is the switching frequency.
If R_FF > 0.02 x R_FB1 then calculate R_FF value from
R_FF = 0.02 x R_FB1.
Maximum Allowable Voltage Ripple at FB Pin
Note that the steady-state voltage ripple at feedback pin FB
(V_FB,RIPPLE) must not exceed 50mV in order for the module
to function correctly. If V_FB,RIPPLE is larger than 50mV then
C_OUT should be increased as necessary in order to keep
the V_FB,RIPPLE below 50mV.
REV1B
13/19