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Friday, September 15, 2023

PWM Regulators Guide




 

PWM IPS in the housings SOT-23-6, SOT-26, TSOP-6

By Imran Ashraf Khan


In the circuitry of modern pulsed power supplies (SMPS), PWM regulators, made in small-sized planar cases with six terminals, have gained wide popularity. The body type designation can be SOT-23-6, SOT-23-6L, SOT-26, TSOP-6, SSOT-6. The layout and layout of the pins are shown in the figure below. In this case, the left fragment of the picture shows the code marking LD7530A
PWM SOT-23-6
Pin Assignment: 
1 - GND. (Common wire). 
2 - FB. (FeedBack - Feedback). Input for controlling the pulse duration with a signal from the output voltage. Sometimes it can have the designation COMP (input comparator). 
3 - RI / RT / CT / COMP / NC - Depending on the type of chip, it can be used for a frequency-assigning RC circuit (RI / RT / CT) or for protection, as a PWM tripping comparator input with a threshold value at its input, specified in the document. In some types of microcircuits this input can be not involved in any way (NC - No Connect). 
4 - SENSE, different CS (Current Sense) - Input from the current sensor at the source of the key. 
5 - VCC - Input voltage supply and start the chip. 
6th - OUT (GATE) - Output to control the gate of the key.
Functionally similar regulators work on the principle of popular earlier PWM chips xx384x series, which have proved themselves in terms of reliability and stability.
Some difficulties often arise when replacing or selecting an analog for similar PWM controllers due to the use of code marking in the designation of the type of microcircuit. The situation is complicated by a large number of component manufacturers, which do not always provide documentation for mass access, and not all manufacturers of ready-made devices supply repair service centers with circuits, so real repair schemes often have to be studied by repairers on the installed components and wiring connections directly on the board.


In practice, PWM chips and EAxxx and Eaxxx marking codes are often found. Official documents on them are not found in free access, but discussions on the forums and pieces of pictures from the PDF from System General, which publishes them as SG6848T and SG6848T2, have been preserved. The picture is attached.

To the attention of the masters we offer tables made up of information available on the Internet and PDF documents for the selection of analogs when replacing the most common six-legged planar PWM with pinout: pin1 - GND, pin2 - FB (COMP), pin4 - Sense, pin5 - Vcc, pin6 - OUT . 
Their main difference is the application and purpose of the output 3.


PWM controllers (PWM), without using output 3.
NamePart NamberDilerMarking
SG6849SG684965TZFairchild / ON SemiBBxx
SG6849SG6849-65T, SG6849-65TZSystem GeneralMBxx EBxx
SGP400SGP400TZSystem GeneralAAKxx
PWM-regulators (PWM) with the installation of the resistor 95-100 kOhm to pin 3.
Using the PWM listed below, the frequency should be set by the resistor RT (RI) from pin 3 to ground. Usually its rating is chosen 95-100 kOhm for frequency 65-100 KHz. More precisely see the attached documentation. PDF files are packaged in RAR.
NamePart NamberDilerMarking
AP3103AAP3103AKTR-G1Diodes IncorporatedGHL
AP8263AP8263E6R, A8263E6VRAiT SemiconductorS1xx
AT3263AT3263S6ATC Technology3263
CR6848CR6848SChip-Rail848H16
CR6850CR6850SChip-Rail850xx
CR6851CR6851SChip-Rail851xx
FAN6602RFAN6602RM6XFairchild / ON SemiACCxx
FS6830FS6830FirstSemi
GR8830GR8830CGGrenergy30xx
GR8836GR8836C, GR8836CGGrenergy36xx
H6849H6849NFHI-SINCERITY
H6850H6850NFHI-SINCERITY
HT2263HT2263MPHOT-CHIP63xxx
KP201Kiwi Instruments
LD7531LD7531GL, LD7531PLLeadtrendxxP31
LD7531ALD7531AGLLeadtrendxxP31A
LD7535 / ALD7535BL, LD7535GL, LD7535ABL, LD7535AGLLeadtrendxxP35-xxx35A
LD7550LD7550BL, LD7550ILLeadtrendxxP50
LD7550BLD7550BBL, LD7550BILLeadtrendxxP50B
LD7551LD7551BL / ILLeadtrendxxP51
LD7551CLD7551CGLLeadtrendxxP51C
NX1049XN1049TPXian-Innuovo49xxx
OB2262OB2262MPOn-Bright-Electronics62xx
OB2263OB2263MPOn-Bright-Electronics63xx
PT4201PT4201E23FPowtech4201
R7731R7731GE / PERichtek0Q =
R7731AR7731AGERichtekIDP = xx
SD4870SD4870TRSilan Microelectronics4870
SF1530SF1530LGTSiFirst30xxx
SG5701SG5701TZSystem GeneralAAExx
SG6848SG6848T, SG6848T1, SG6848TZ1, SG6848T2Fairchild / ON SemiAAHxx EAxxx
SG6858SG6858TZFairchild / ON SemiAAIxx
SG6859ASG6859ATZ, SG6859ATYFairchild / ON SemiAAJFxx
SG6859SG6859TZFairchild / ON SemiAAJMxx
SG6860SG6860TYFairchildAAQxx
SP6850SP6850S26RGSporton Lab850xx
SP6853SP6853S26RGB, SP6853S26RGSporton Lab853xx
SW2263SW2263MPSamWin
UC3863 / GUC3863G-AG6-RUnisonic Technologies CoU863 U863G
PWM controllers in which pin 3 is used differently.
When using the PWM controllers listed below, you should pay attention to pin 3, which can be used to organize protection - thermal or from exceeding the input voltage. 
The frequency can be fixed at 65kHz, or be set by the capacitor rating on pin 3. 
When replacing any microcircuits with analogs, carefully study the documentation. PDF files are packed in the RAR archive.
NamePart NamberDilerMarking
AP3105 / V / L / RAP3105KTR-G1, AP3105VKTR-G1, AP3105LKTR-G1, AP3105RKTR-G1Diodes IncorporatedGHN GHO GHP GHQ
AP3105NA / NV / NL / NRAP3105NAKTR-G1, AP3105NVKTR-G1, AP3105NLKTR-G1, AP3105NRKTR-G1Diodes IncorporatedGKN GKO GKP GKQ
AP3125A / V / L / RAP3125AKTR-G1, AP3125VKTR-G1, AP3125LKTR-G1, AP3125RKTR-G1Diodes IncorporatedGLS GLU GNB GNC
AP3125BAP3125BKTR-G1Diodes IncorporatedGLV
AP3125HA / HBAP3125HAKTR-G1, AP3125HBKTR-G1Diodes IncorporatedGNP GNQ
AP31261AP31261KTR-G1Diodes IncorporatedGPE
AP3127 / HAP3127KTR-G1, AP3127HKTR-G1Diodes IncorporatedGPH GSH
AP3301AP3301K6TR-G1Diodes IncorporatedGTC
FAN6862FAN6862TYFairchild / ON SemiABDxx
FAN6863FAN6863TY, FAN6863LTY, FAN6863RTYFairchild / ON SemiABRxx
HT2273HT2273TPHOT-CHIP73xxx
LD7510 / JLD7510GL, LD7510JGLLeadtrendxxP10 xxP10J
LD7530 / ALD7530PL, LD7530GL, LD7530APL, LD7530AGLLeadtrendxxP30 xxxP30A
LD7532LD7532GLLeadtrendxxP32
LD7532ALD7532AGLLeadtrendxxP32A
LD7532HLD7532HGLLeadtrendxxP32H
LD7533LD7533GLLeadtrendxxP33
LD7536LD7536GLLeadtrendxxP36
LD7536RLD7536RGLLeadtrendxxP36R
LD7537RLD7537RGLLeadtrendxxP37R
ME8204ME8204M6GMicrOneME8204xx
NCP1250NCP1250ASN65T1G, NCP1250BSN65T1G, NCP1250ASN100T1G, NCP1250BSN100T1GON Semiconductor25xxxx
NCP1251NCP1251ASN65T1G, NCP1251BSN65T1G, NCP1251ASN100T1G, NCP1251BSN100T1GON Semiconductor5xxxxx
OB2273OB2273MPOn-Bright-Electronics73xx
R7735R7735AGE, R7735HGE, R7735GGE, R7735RGE, R7735LGERichtek
UC3873 / GUC3873-AG6-R, UC3873G-AG6-RUnisonic TechnologiesU873 U873G
The table is updated as information becomes available.


How to read LDO LCD 8-pin regulator code 00HC5W



  • This kind of regulator is often found on the Toshiba LCD motherboard, and the shape is similar to ic eeprom.
  • The BD writing code is not written on the physical ic regulator. So for example just written 00IC0W, 00IA5W

How to read the specs: For example say 00HC5W




(1) Code "00" This means that the output voltage variable or can diajust by changing the value of the feedback resistor. 
(2) The "H" code indicates that the maximum input allowable voltage is 10v. 
(3) The code "C5" indicates that the maximum current capability of 1.5A 

Example usage:
  • Input Voltage: 8.0v
  • Output voltage: 1.5v to 7v - can be obtained by changing the value of R1 / R2
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6 pin Regulator SMD Chip Codes
6 pin PWM IC code
5xy= NCP1251,
IDP606 = R7731A,
63xxx = OB2263,
WP35/XP35 = LD7535,
ABx = FAN6862,
xxP/50 = LD7550IL_BL,
xxP/50 = LD7550IL_BL
52xxx = OB2252
62xxx = OB2262
73xxx = 0B2273
AAIxx = SG6858TZ
G6G = AP4313
37x = LD7537

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