at1735 Aimtron Technology, at1735 Datasheet
at1735
Related parts for at1735
at1735 Summary of contents
Page 1
... The gate-on pulse modulator control (SWCTL) is independent of the SHDN chip enable control. The AT1735 adopts a 24-pin thin QFN package which is 4mm x 4mm with a maximum thickness of 0.8mm for ultra-thin LCD panel application. http://www.aimtron.com.tw WWW: service@aimtron ...
Page 2
... Sequence 2.5V Control VDDCP Negative SWN Charge-pump Control FBN Positive SWP Charge-pump Control REF Ref FBP SHDN POSOP VPS VDDOP GON OUTOP Gate-on DRN Pulsewidth Modulation NEGOP Control THR SWCTL AGOTP WWW: 2 AT1735 Marking AT1735N VMAIN VP VGON REF http://www.aimtron.com.tw service@aimtron.com.tw Email: ...
Page 3
... No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 3/20/2008 REV:1.1 LCD Panel Power Supplies with Low-Cost Function when SWCTL is low. regulation level. The threshold voltage is 10 × V GON DLP WWW: 3 AT1735 THR. . http://www.aimtron.com.tw service@aimtron.com.tw Email: ...
Page 4
... REV:1.1 LCD Panel Power Supplies with Low-Cost Rated Value Min. -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -30.0 -40.0 - -35 -55 - -200 -2 Values Symbol Min. Typ VCC T -20 + WWW: Email: 4 AT1735 Unit Max. +6.0 V +6.0 V +18.0 V +18.0 V +18.0 V +18.0 V +30.0 V +30.0 V +75.0 mA 1349 +150 C 0 +300 C 200 Unit Max. ...
Page 5
... VCC = 12V, 5mA < I < 500mA OUTL Buffer configuration 4V, no load POSOP ( NEGOP POSOP VDDOP TA = +25 ℃ NEGOP POSOP VDDOP NEGOP POSOP WWW: 5 AT1735 = V = INL VDDCP Values Unit Min. Typ. Max 0.7 0 4.9 5.0 5 1275 1500 1725 ...
Page 6
... FBP V = 2.6V FBP Falling edge I = -10mA GOFF 10.8V~13.2V, OUTL VDDCP V = -6V -50mA GOFF GOFF V = 250mV FBN V = 350mV FBN V = 150mV FBN Rising edge WWW: Email: 6 AT1735 125 VDDOP VDDOP - VDDOP VDDOP -150 - 110 200 250 50 125 -40 +80 ...
Page 7
... DRN SWCTL= low DLP REF AGOPT REF DLP REF SWCTL=high AGOPT REF DLP REF SWCTL =low V rising edge AGOTP WWW: Email: 7 AT1735 0.8 V 1.4 V 2.5 µA 3.8 5 6.2 µA 2.375 2.5 2.625 V 60 Ω 1.3 kΩ 1.3 kΩ 1 µ ...
Page 8
... SWN SWP AIMTRON DLP 0.1µF AT1735 POSOP VDDOP FBP OUTOP NEGOP VPS SHDN GON AGOTP 20kΩ DRN THR SWCTL WWW: Email: 8 AT1735 VIN 12V 10µF VMAIN C1 10V/400mA 4.7µF R1 100kΩ R2 33.2kΩ BAT54S 0.1µF 0.1µF VP BAT54S 23V/20mA R3 270kΩ 1µF R4 33.2kΩ ...
Page 9
... REV:1.1 LCD Panel Power Supplies with Low-Cost Linear Regulator Load Regulation 0.5 0 -0.5 -1 Iout=50mA Iout=300mA -1 VDDOP No-load Supply Current vs. Supply Voltage 1.6 1.4 1.2 1.0 0.8 0 WWW: 9 AT1735 10 100 1000 Output Current (mA Supply Voltage (V) http://www.aimtron.com.tw service@aimtron.com.tw Email: ...
Page 10
... Positive Charge-pump Load Regulation 0.5 0 -0.5 -1 -1.5 Iout=20mA - Negative Charge-pump Load Regulation 0.25 0.00 -0.25 -0.50 -0.75 -1.00 -1. 0.2 0 -0.2 -0.4 -0.6 0.8 1 -20 WWW: 10 AT1735 Output Current (mA) VIN = 12V VGOFF = - 100 Output Current (mA) Reference Voltage vs. Temperature Temperature (℃ INL VDDCP http://www.aimtron.com.tw service@aimtron.com.tw Email: ...
Page 11
... Tel: 886-3-563-0878 Fax: 886-3-563-0879 3/20/2008 REV:1.1 LCD Panel Power Supplies with Low-Cost = 23V, Ta=+25 ℃ .) Load Transient Response CH1: V OUTL CH2 OUTL VGON Pulsewidth Modulation Control CH1: VGON CH2: AGOTP WWW: 11 AT1735 CH3: SWCTL http://www.aimtron.com.tw service@aimtron.com.tw Email: ...
Page 12
... No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 3/20/2008 REV:1.1 LCD Panel Power Supplies with Low-Cost OP Amp Large-signal Response CH1: V POSOP CH2: V OUTOP Power–up Sequence CH1: VMAIN CH3: VP CH2: VGOFF http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 12 AT1735 ...
Page 13
... The gate-on pulse modulator control, SWCTL, is independent of the SHDN chip enable control in AT1735. Linear Regulator The linear regulator of AT1735 uses an internal P-channel MOSFET to supply load currents up to 500mA. The internal reference voltage of linear regulator is 2.5V, connect an external resistive voltage-divider (R1 & the Typical Application Circuit shown) to set the output voltage as requirement ...
Page 14
... LCD Panel Power Supplies with Low-Cost charges to VMAIN minus a diode drop. During the . This connects C in parallel with the reservoir CPN charges to VMAIN minus a diode drop. CPP by VMAIN volts. This connects C CPP . The amount of charge transferred to the POS WWW: Email: 14 AT1735 in CPP http://www.aimtron.com.tw service@aimtron.com.tw ...
Page 15
... After soft-start period, if feedback voltage of the linear regulator or any of the charge-pump regulator outputs does not exceed its fault-detection threshold, the AT1735 enables the internal fault timer. If any fault condition exceeds the fault-timer duration (44ms typical), the AT1735 shuts down all the outputs except the reference. ...
Page 16
... No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 3/20/2008 REV:1.1 LCD Panel Power Supplies with Low-Cost VPS Q1 GON Q2 9R DRN R THR Error Amplifier 100kΩ WWW: Email: 16 AT1735 VP VGON 20kΩ REF 100kΩ 10kΩ http://www.aimtron.com.tw service@aimtron.com.tw ...
Page 17
... Linear-Regulator, Charge-Pumps and High-Current OP Power-Up Sequence When the AT1735 is powered up, the REF voltage rises with the input power. After the REF voltage is regulated and SHDN is logic high, the linear regulator, OPA and the negative charge-pump regulator are enabled and enter the soft-start period. ...
Page 18
... The linear regulator’s power dissipation can be calculated in the following equation: P For some applications, the load current may be much higher than the regulator’s guaranteed output current for the AT1735. It can be connect an external PNP transistor to solve this issue as shown in Figure 5. Figure 5. High-Current Linear Regulator 7F, No ...
Page 19
... The most critical aspect of the layout is the placements of the input bypass capacitors of pin VCC, INL, VDDCP, VDDOP, VPS and REF. They must be placed as close as possible to the AT1735 to reduce the input ripple voltage and noise coupling. 2. Power loops on the input and output of the converters should be connected with the shortest and widest traces as possible ...
Page 20
... Linear-Regulator, Charge-Pumps and High-Current OP Package Outline: Thin QFN-24 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 3/20/2008 REV:1.1 LCD Panel Power Supplies with Low-Cost http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 20 AT1735 ...
Page 21
... C 60-120 seconds 183 ° C 60-150 seconds 225+0/-5 ° C 240+0/-5 ° C 10-30 seconds 10-30 seconds 6 ° C/second max. 6 minutes max. Fax: 886-3-563-0879 21 AT1735 Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness ≥2.5mm or <2.5mm or Pkg. volume Pkg. volume 3 ≥350mm 3 3 ° ...