BD8372HFP-M_15 Datasheet, PDF (11/29 Pages) Rohm – 1ch Source Driver for Automotive

BD8372HFP-M BD8372EFJ-M
3. Current Control at Output Saturation
When VIOUT (=VF) - VIN > 0.5V (TYP), the LED current IF is decreased to a set current 20µA (TYP). Therefore, VF
decreases due to the decrease in the current. Open detection can be prevented by keeping VIOUT ≤ VIN-0.5V. The
current controlled to IOUT<20µA and the LED current IF must be set so that VF does not exceed VUVLO_OPEN by 20µA.
If VIN < VUVLO_OPEN this function is not active.
VI_VO_VUI_IOOTU>_UTV_T>＞I_VOUI_{VOTIU_OTOU_POT}EP_{_}N_OENPEN
0.5V
Ho_Hw_oe_wv_ee_vr_e, _ro_, p_oe_pn_end_de_et_te_ec_ct_tio_ion_n is _mm_aa_ss_kk_ee_dd
by_bV_y IN_V<_INV_<U_VV_UL_VO_L_O_OP_{_O}EN_PEN.
V_VI_IN_N
VVIIOOUUTT__OOPPENEN
VVIINN--VVDDRRHH_I_OIOUUT T
V^VIO^IOU^UT(^T=⁽⁼V^VF^F) ⁾
VVUUVVLLOO_O_OPEPNEN
0
Setting current
I^II^IO^OU^UT^T(=^（=IF^IF) ⁾
LLEEDD VVFF__IIFFCChahraarcatcetreisrtiisctic
0
T^Th^he^ec^cu^ur^rr^re^enⁿt^t d^de^ec^cr^re^ea^ass^ee^ss ^bb^yy^VV^IOIOU^UT^T>^>V^VIN^IN-V^-D^VR^D_I^ROU^_IT^OUT
to^foa^{r a}se^st^etcu^cr^ur^re^rn^ent.^t.
IIIOOUUT=T2=200µuAA(（Mmax）)
To k_ee_ee_pp_VV_II_OOU_UT_T≦≤ _VII_NN-_-0₀.5_.4V_V,_, t_th_he cu_rre_nt is _conn_tt_rolll_ee_dd_. to IOUT=20µA (Max)
※To IOUT=20uA(max)
VIN
Current
control
LED_OPEN
-
VIN-0.2V
+
IOUT
-
VIN-
0.5V
+
Current limit
ISET
Figure 15. Current Control at Output Saturation
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TSZ22111・15・001
11/25
TSZ02201-0T1T0C700150-1-2
09.Dec.2015 Rev.001