AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Features General Description • Low start-up power supply voltage :1.7V(CH6) • Wide supply voltage range from 2.4V to 6.5V (CH6); 3.6V to 6.5V(CH1~5) • Up to 1MHz operating frequency • Supports for down and up/down Zeta synchronous rectification conversion(CH1) • Supports for up and up/down SEPIC synchronous rectification conversion(CH2, CH5) • Supports for up, flyback and up/down SEPIC conversion AT1393/C: CH2,CH3, CH4 , CH5 and CH6 AT1393A/B:CH2,CH3,CH5 and CH6 • Supports for inverting conversion AT1393A:CH4 • Synchronized rectification on CH1,CH2,CH5 • Power ON/OFF control function • Built-in Soft-Start function • Built-in Short-Circuit Protection circuit. • LQFP 48 package The AT1393 provides a complete power solution for digital still and video cameras through the integration of synchronous rectification topology , soft start function and short circuit detection function. This IC is ideal for applications that use either 2 or 3 alkaline or NIMH batteries as well as those using a single Li-ion battery. Applications • Digital Cameras • CCD Imaging Devices • Camcorders Pin Assignment Ordering Information Part Number AT1393F AT1393F_PBF AT1393F_GRE AT1393AF AT1393AF_PBF AT1393AF_GRE Package LQFP48 LQFP48, PB-Free LQFP48,Green LQFP48 LQFP48, PB-Free LQFP48,Green Marking AT1393F AT1393F,date code with one bottom line AT1393F,date code with two bottom line AT1393AF AT1393AF,date code with one bottom line AT1393AF,date code with two bottom line Aimtron reserves the right without notice to change this circuitry and specifications. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 1 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Pin Description Pin No. Pin name Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 SWOUT SWIN FB6 IN6 CIN6 DTC5 FB5 IN5 INA4 OUTA4 FB4 IN4 INS4 DTC4 CS VREF AGND CSCP VCC CTL CTL1_ 2 CTL3 CTL4 CTL5 RT CT VB IN3 FB3 DTC3 IN2 FB2 DTC2 IN1 FB1 DTC1 OUT1-1 OUT1-2 OUT2-1 OUT2-2 OUT3 PVCC OUT4 Output Switch Control Circuit Output Output Switch Control Circuit Input CH6 Error Amplifier Output CH6 Error Amplifier Inverted Input CH6 Soft Start Setting CH5 Dead Time Control CH5 Error Amplifier Output CH5 Error Amplifier Inverted Input CH4 Inverting Amplifier Input CH4 Inverting Amplifier Output CH4 Error Amplifier Output CH4 Error Amplifier Inverted Input CH4 Short Detection Comparator Inverter Input CH4 Dead Time Control CH1 to CH5 Soft Start Setting Reference 2.5V Output Ground Timer Latch Shout-Circuit Detection Input Power Supply CH6 Power Supply Control Input CH1 and CH2 ON/OFF Control Input CH3 ON/OFF Control Input CH4 ON/OFF Control Input CH5 ON/OFF Control Input Oscillation Frequency Setting Resistor Oscillation Frequency Setting Capacitor Triangular Wave Oscillator Regulator Output CH3 Error Amplifier Inverted Input CH3 Error Amplifier Output CH3 Dead Time Control CH2 Error Amplifier Inverted Input CH2 Error Amplifier Output CH2 Dead Time Control CH1 Error Amplifier Inverted Input CH1 Error Amplifier Output CH1 Dead Time Control CH1 Main Side Output(P-CH MOSFET) CH1 Synchronous Rectifier Side Output CH2 Main Side Output CH2 Synchronous Rectifier Side Output CH3 Output(N-CH MOSFET) Output Circuit Power Supply CH4 Output AT1393/C:Drive N-CH MOSFET for boost converter AT1393A/B:Drive P-CH MOSFET for inverting 44 45 46 47 48 PGND OUT5-1 OUT5-2 OUT6 RB Output Circuit Ground CH5 Main Side Output(N_CH MOSFET) CH5 Synchronous Rectifier Side Output CH6 Output Output Current Setting Resistor 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 2 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Absolute Maximum Ratings Parameter Symbol Condition Vcc -- Power supply voltage Rating Min Max Unit -- 7 V Output current Io Output pin -- 20 mA Output peak current Io Output pin, Duty≦5% -- 200 mA Power dissipation PD Ta≦25℃ (LQFP-48P) -- 860 mW Operating temperature TOPT -- -30 85 ℃ Storage temperature TSTG -- -55 125 ℃ ESD Susceptibility (HBM) -- 2 KV ESD Susceptibility (MM) -- --- 200 V Recommended Operating Conditions Parameter Symbol Condition Min Value Unit Typ Max Startup power supply voltage Vcc CH6 1.7 -- 5.5 V Power supply voltage Vcc CH6 CH1 to CH5 2.4 3.6 5.0 5.0 5.5 5.5 V V Reference voltage output current IOR VREF pin -1 -- 0 mA VB pin output current IB VB pin -0.5 -- 0 mA IN1 to IN5, INA4, INS4 pins 0 -- Vcc V IN6 pin 0 -- Vcc-0.9 V CTL pin 0 -- 7 V OUT pin (CH1 to CH5) -- 2 15 mA OUT pin (CH6) 1 2 15 mA OUT pin -- 1 4 mA RB6 pin 2.4 24 51 kΩ Input voltage Control input voltage Output current VIN VCTL Io Output current setting resister RB Oscillator fOSC -- 100 500 1000 kHz Timing capacitor CT -- 47 100 560 pF Timing resistor RT -- 8.2 18 100 kΩ Cs CH1 to CH5 -- 0.027 1.0 μF CH6 -- 0.47 1.0 μF Soft start capacitor C+IN6 Short detection capacitor CSCP -- -- 0.1 1.0 μF VB pin capacitor CVB -- 0.082 0.1 -- μF Operating ambient temperature Ta -- -20 25 85 ℃ 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 3 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Electrical characteristics (Ta=25℃, VCC=PVCC=5V) Parameter Reference voltage block [REF] Reference voltage Output voltage temperature stability Symbol Condition VREF -- △VREF Ta = -30℃ to 85℃ /VREF Min Value Unit Typ Max 2.40 2.50 2.60 V -- 0.5 -- % -- 10 mV Load stability Load VREF=0mA to –1mA -10 -- 10 mV VTH VIN=0V to VCC 2.6 2.8 3.0 V Hysteresis width VH -- 0.2 -- V Threshold voltage Reset voltage VRST VIN=VCC to 0V 1.20 1.30 1.40 V Threshold voltage VTH VIN=0V to VCC 1.35 1.5 1.65 V Charge current ICS -1.4 -1.0 -0.6 μA Charge current ICIN6 -3.0 -2.5 -2.0 μA Threshold voltage VTH -- 0.65 0.70 0.75 V Input standby voltage VSTB -- -- 50 100 mV VI -- -- 50 100 mV ICSCP -- -1.4 -1.0 -0.6 μA 450 500 550 kHz Triangular wave oscillator block [OSC] Short circuit detection block [SCP] Under voltage lockout block [U.V.L.O] CH1 to CH5 -10 CH6 VCC=3.6 to 5.5V Soft start block [CS] Line Soft start block [CIN6] Input stability Input latch voltage Input source current Oscillator frequency Frequency stability for voltage Frequency stability for temperature Threshold voltage VT temperature stability -- -- fOSC CT=100pF, RT=18kΩ △f /fdv VCC=4V to 5.5V -- 1 10 % △f /fdt Ta=-30℃ to 85℃ -- 1 20 % VTH FB=IN 1.24 1.25 1.26 V -- 0.5 -- % △VT/VT Ta = -30℃ to 85℃ 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 4 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Error Amplifier block (CH1 to CH5) [Error Amp] Input bias current Error amplifier block (CH6) [Error Amp] -80 -- nA IN=0V (CH4) -120 -30 -- nA DC 60 100 -- dB Frequency bandwidth BW AV=0dB -- 1.0 -- MHz Output voltage Output source current Output sink current VOH -- 2.2 2.4 -- V VOL -- -- 50 200 mV -- -2.0 -1.0 mA 70 140 -- μA ISOURCE FB=2.3V ISINK FB=1.45V VTH FB=0.55 1.24 1.25 1.26 V △VT/VT Ta = -30℃ to 85℃ -- 0.5 -- % -100 -20 -- nA Input bias current IB IN=0V Voltage gain AV DC 60 75 -- dB Frequency bandwidth BW AV=0dB -- 1.0 -- MHz Output voltage Output source current Output sink current Input offset voltage Inverting amplifier block (CH4) [Inv Amp] -320 AV Temperature stability Short detect comparator (CH1 to CH5) [SCP Comp] IN=0V (CH1 to CH3, CH5) Voltage gain Threshold voltage Short detect comparator (CH6) IB VOH -- 1.1 1.3 -- V VOL -- -- 0 200 mV -- -2.0 -1.0 mA ISOURCE FB=0.55V ISINK FB=0.55V 60 120 -- μA VIO OUT=1.25V -10 0 10 mV -120 -30 -- nA Input bias current IB IN=0V Voltage gain AV DC 60 100 -- dB Frequency bandwidth BW AV=0dB -- 1.0 -- MHz Output voltage Output source current Output sink current Threshold voltage Input bias current Threshold voltage VOH -- 2.2 2.4 -- V VOL -- -- 50 200 mV -- -2.0 -1.0 mA ISOURCE OUT=1.25V ISINK OUT=1.25V 70 140 -- μA VTH CH1 to CH5 0.97 1.00 1.03 % IN=0V (CH1 to CH3, CH5) -320 -80 -- nA IN=0V (CH4) -200 -50 -- 0.8 0.9 IB VTH nA 1.0 V 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 5 AT1393/A/B/C Preliminary Product Information General Control block (CTL, CTL1 to CTL5) [CTL] Output switch control block [SW] Output block (CH6) [Drive] Output block (CH1 to CH5) [Nch MOS] Output block (CH1,2,4,5) [Pch MOS] PWM Comp. (CH6) [PWM Comp] PWM Comp. (CH1 to CH5) [PWM Comp] 6-Channel DC-DC Converter IC for DSC Threshold voltage Input current Threshold voltage Maximum duty cycle Output source current Output sink current Output ON resistor Output source current Output sink current Output ON resistor Output source current Output sink current SW input voltage Input current Output source current Output sink current Output ON resistor VT0 Duty = 0 % 1.0 1.1 -- V VTmax Duty = 100 % -- 1.8 1.9 V IDTC DTC=0.4V (CH1 to CH5) -1.0 -0.3 -- μA VT0 Duty = 0 % 0.2 0.3 -- V Duty = 100 % -- 0.74 0.84 V CT=100pF, RT=18kΩ RB=24kΩ 70 80 -- % ISOURCE OUT=VCC/2 -- -130 -- mA ISINK OUT=VCC/2 -- 100 -- mA ROH OUT = -15mA -- 18 30 Ω ROL OUT = 15mA -- 16 25 Ω ISOURCE OUT=VCC/2 -- -130 -- mA VTmax Dtr ISINK OUT=VCC/2 -- 100 -- mA ROH OUT = -15mA -- 18 30 Ω ROL OUT = 15mA -- 16 25 Ω ISOURCE OUT=0.7V,RB=24kΩ -2.6 -2.0 -1.4 mA ISINK Duty≦5%,OUT=0.7V -- 40 -- mA VIH SWOUT = ”L” level 1.5 -- 6.5 V VIL SWOUT = ”H” level 0 -- 0.4 V ISWIN SWIN = 5V -- 100 200 μA ISOURCE Duty≧95%, SWOUT=0V -- -9 -- mA ISINK Duty≦5%, SWOUT=5V -- 17 -- mA ROH SWOUT = -4mA -- 250 400 Ω ROL SWOUT = 4mA -- 100 150 Ω VIH Active mode 1.5 -- 6.5 V VIL Standby mode 0 -- 0.4 V ICTL CTL = 5V -- 100 200 μA CTL input voltage Input current VCC Standby current PVCC Standby current VCC Nominal Supply current Icss CTL=0V -- -- 10 μA Icss(o) CTL=0V -- -- 10 μA -- 6 9 mA Icc CTL, CTL1 to CTL5 = 5V 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 6 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Block Diagram 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 7 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Application Circuit 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 8 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 9 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Typical Characteristics 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 10 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 11 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Function Description 1. Power Converter ＊Reference voltage block A temperature independent voltage of typical value at 2.50V is generated from the power source by the reference voltage circuit, which is used as a reference voltage for all internal circuitry and supplies load current to external device up to 1 mA. ＊Triangular oscillator block A triangular oscillation waveform is generated by connecting a timing resistor (RT) to pin 25 and a timing capacitor (CT) to pin 26. The resulting waveforms CT (amplitude at 0.3V to 0.8V), CT1 (in phase with CT with amplitude at 1.1V to 1.8V) and CT2 (reverse phase with CT with amplitude at 1.1V to 1.8V) serve as input to the PWM comparator. ＊Error amplifier block The error amplifier controls the error signal to the PWM comparator by sensing the DC/DC converter output voltage. Furthermore, by connecting feedback resistor and capacitor from the output pin to the inverted input pin of the error amplifier, an arbitrary loop gain can be set to make the system stable. ＊Inverting amplifier block The inverting amplifier detects the negative DC/DC converter output voltage and sends a control signal to the error amplifier. ＊PWM comparator block The PWM comparator converts the input voltage to pulse width and thereby the duty cycle of the DC/DC converter. Channels 1, 2, and 5 main sides, channel 3, 4, and 6 : The comparator keeps the output transistor turn on while the error amplifier output voltage and DTC voltage are higher than the triangular wave voltage. Channels 1, 2, and 5 synchronous rectification sides : The comparator keeps the output transistor turn on while the error amplifier output voltage are lower than the triangular wave voltage. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 12 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC ＊Output block A totem pole configuration is designed for the output block and can drive external MOSFET or transistor. 2. Channel Control The channels are turned on and turned off according to the voltage levels at the CTL, CTL12, CTL3, CTL4, and CTL5 as described in the following table. Voltage level at control (CTL) pin Channel on/off status CTL CTL1,2 CTL3 CTL4 CTL5 CH6 CH1,2 CH3 CH4 CH5 L X X X X OFF (standby state) L OFF L OFF H ON L OFF L OFF H ON H ON L OFF L OFF L OFF H ON H ON L OFF H ON H ON H ON L OFF L OFF H ON L OFF L OFF H ON H ON H ON L OFF L OFF H ON H ON L OFF H ON H ON X : Don’t care 3. Protective Functions ＊Short circuit protection and timer latch The comparator for short circuit detection in each channel detects the output voltage level of the power converter. When the output voltage falls below the short detection level, there will be a constant bias current charging the external capacitor CSCP that is connected to the CSCP pin until the capacitor voltage level reaches about 0.7V and the output transistor turned off consequently. The actuated protection can be reset by restarting the power source. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 13 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC ＊Under-voltage lockout protection The under-voltage lockout protection is triggered when the supply voltage momentarily drops during transient, which may cause the IC to malfunction. To prevent such malfunctions, the under-voltage lockout protection circuit will turn off the output transistor, set the dead time to 100%, and hold the CSCP pin at the “L” level after detecting a decrease in internal reference voltage with respect to the power supply voltage,. ＊Output switch control When the power is turned on, output switch control circuit (SWIN = “L”) prevents the reactive current from flowing to external CH5 and CH6. After releasing UVLO and the C+IN6 pin voltage goes above 0.9V, if SWIN is “H” then SWOUT becomes “L” to turn on the external MOSFET and generate output voltage. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 14 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC 4. Soft Start Function ＊The CTL, CTL1,2, CTL3, CTL4, and CTL5 terminals are driven to high level at the same time. The driving scheme is described in the following diagram. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 15 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC ＊After CH6 soft start and driving the CTL1,2, CTL3, CTL4, and CTL5 to high level. The driving scheme is described in following diagram. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 16 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC ＊Soft start setting (for CH6) VC + IN ^ = 1.25 × (1 − e −( Ts ) RC ) 45K * 75K R= 45K + 75K Consider the input voltage and the load current to decide the value of the capacitor connected to the CIN6 pin. The soft start time Ts(s) until the DC/DC converter output voltage of CH6 reaches 95% can be calculated by: Ts(s) = 0.45 * C1(μF) ＊Soft start setting (for CH1 to CH5) Ts(s) = 1.25 * CS(μF) Note : It could be disabled soft start function by floating CIN6 pin or CS pin. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 17 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Determine Oscillator Frequency The triangular oscillator frequency is decided by the timing capacitor (CT) and timing resistor (RT) according to the following formula: fOSC(KHz) = 900000/( RT(KΩ)* CT(pF)) DC/DC Output Voltage ＊For CH1 to CH3, CH5 and CH6 ＊For CH4 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 18 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 19 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC The CH6 Source Current The output circuit of CH6 is illustrated in the following diagram. It can determine the output source current by defining the value of resistor RB. Note that the source current can be calculated by the following equation. Output source current = (VRB/RB) * 210 (A) Setting Time of Short Circuit Protection The SCP comparator in each channel detects the output voltage to decide whether the power converter works at normal condition. At the same time, the voltage level of CSCP pin is held at low level. If the output load of these converters rapidly malfunction or become shorted, causing the output voltage to drop, the SCP comparator detects that and enables short circuit protection. The time period for short circuit protection is shown in the following equation. Short detection time (tPE(s)) tPE(s) = 0.7 * CSCP (μF) Note : It could be disabled short circuit protection function by connecting CSCP pin into the ground. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 20 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Setting the Dead Time Control Level When using step up or Zeta or flyback DC/DC converter, it must prevent that output transistor works at full-ON state (ON duty = 100%). To prevent this situation, set the maximum duty of these channels. The dead time control circuit is implemented as below. When the voltage at the DTC1 pin is higher than the triangular wave voltage (CT1), the output transistor is turned on. The maximum duty calculation formula assuming that triangular wave amplitude = 0.7V and triangular wave minimum voltage = 1.1V. Duty = [(Vd − 1.1) / 0.7] × 100% Note 1 : The circuit is suitable at CH1 to CH5. Note 2 : Shorting DTC and VREF to disable dead time control function. Using CH4 Inv Amp. When not using the CH4 INV Amp., connect the INA4 and OUTA4 each other. 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 21 AT1393/A/B/C Preliminary Product Information 6-Channel DC-DC Converter IC for DSC Package Description LQFP48 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 22