SPW3842S Datasheet, PDF (1/10 Pages) SeCoS Halbleitertechnologie GmbH – High Performance Current Mode Controlers

Elektronische Bauelemente
SPW3842S
High Performance Current Mode
Controlers
RoHS Compliant Product
Description
The SPW3842S is high performance fixed frequency current mode
controllers. This is specifically designed for Off-Line and DC TO DC
converter applications offering the designer a cost-effective solution
with min. external components. These integrated circuits feature a
trimmed oscillator for precise duty cycle control. A temperature
compensated reference, high gain Error amplifier, current sensing
comparator, and a high current totem pole output ideally suited for
driving a power MOSFET. Also included are protective features
consisting of input and reference undervoltages lockouts each with
hysteresis, cycle-by-cycle current limiting, proprammable output
deadtime, and latch for single pulse metering.
Features
* Low Startup And Operating Current
* Automatic Feed Forward Compensation
* High Current Totem Pole Output
* Trimmed Oscillator For Precise Frequency Control
* Oscillator Frequency Graranteed At 250kHz
* Undervoltage Lockout With Hysteresis
* Current Mode Operation To 500kHz
* Internally Trimmed Reference With Undervoltage Lockout
* Iatching PWM For Cycle-By-Cycle Current Limiting
SOP-8
0.40
0.90
6.20
5.80
0.25
0.19
0.25
o
45 _{0.375 REF}
3.80
4.00
0.35
1.27 Typ.
0.49
4.80 0.10 0.25
5.00
1.35
o
0
1.75
o
8
Dimensions in millimeters
8 765
Date Code
3842
1
2
3
4
SOP-8L
Function
Pin1:Compensation
Pin2:Voltage Feedback
Pin3:Current Sense
Pin4:RT/CT
Pin5:Ground
Pin6:Output
Pin7:Vcc
Pin8:Vref
Description
This pin is the Error Amplifier output and is made available for loop
compensation.
This is the inverting input of the Error Amplifier. It’s normally con^rn^oe^gc^rt^ae^md^mto^et^dhe^by
Switching power supply output through^paa^cr^ite^os^ris^Cto^Tr^td^oiv^gi^rd^oe^ur.^{nd .Operation 500kHz}
A voltage proportional to inductor current is connected to this input .The
PWM uses this information to terminate the output switch conduction.
T_Tchohen_{enooessccctiii}ln_ll_la_agtto_orerrsffr_riseetq_qouureeR_nnTc_cyyto_aa_nVnddre_mmf _aaan_xxd_ii_mmc_uua_{mpmpaaococuiuitttotop}pr_ruuC_Ctt _TdTd_uut_ttoot_yyg_gccr_yroyoccu_uleln_ned_daa_.r.reOOe_pppp_reer_orro_gaag_rttari_iooa_mnnm_mn55m_t0e0se_d00d_{ukkbpHHbyzzyto}
is possible.
T_T^TTh_h^hhi_i^is_s^sis_oopu_u^iisnt_tp_p^itsu_u^ht_t^eth_dde_i^ri_rr^e_eec^f_cc^eo_tt^rm_ll_y^eybⁿ_dd^ci_r^nre_ii_v^ev_e^deo_ss^uc_t^tot_h^phn_e^uet^tr_g^og._a^laIt_t^ct_eei^pr_o^cro^o_f^ufv_a^itaird_p^ype_o^aos_w^nw_e^cde_r^hrp_M^aoMr_O^wgOⁱ_S^enSr_F^gFg_E^cEr_T^ouT_.^ur.^r_P^neP_e^dne_a^.ta_k^fk^o_cc^r_uu_r^c_rr_e^are_n^pn_t^a_st^cs_u^itu_p^op^r_to^Cto^T
1 A are sourced and sunk by this pin.
This pin is the positive supply of the control IC.
T_Th_hi_is_{s i}i_ss _thth_ee_rere_fefe_rer_nen_cece_ouo_tu_pt_up_tu_. t_It ._pIt_rop_vr_io_dv_ei_sde_cs_hac_rh_ga_inr_ggi_cn_ug_rrc_eu_nr_tre_fon_rt_cf_ao_pr_ac_ca_itp_oa_r c_Cit_Tor CT
through resistor RT.
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
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