ELM652DA Dual-channeling CV/CC mode 36V switching controller ■General description ELM652DA is a dual-channeling CV/CC mode switching regulator. ELM652DA is designed to allow for operating a wide supply voltage range from 8V to 36V. ELM652DA features a dual-channeling CV/CC mode control functions, the CV mode (Constant voltage) function to provide a regulated voltage output and the dual-channeling CC mode (Constant current) function provides dual-channeling current limitation function, it is suitable for the DC / DC switching power applications when requested the dual-channeling current limitation function. ■Features ■Application • • • • • • • • • • • • • • • • • UVLO protection Dual-channeling CV/CC mode control Soft start function for start-up Output over-voltage protection Over temperature protection Fold back short-circuit protection High efficiency operation Synchronization rectification Input voltage range : 8V to 36V Fixed operating frequency : 100kHz Voltage reference accuracy : 5.0V±1% Current limit accuracy : ±4% Package : SOP-8 Car charger(USB. 2ch) Automotive power applications DC/DC converters with current limited General purpose CV/CC power supply ■Maximum absolute ratings Parameter VCC to GND PDRV to VCC NDRV to VCC VOUT to GND CS1 to GND CS2 to GND COMP to GND Power dissipation at Ta <60 °C Operating temperature Storage temperature range Symbol Vcc PDRV NDRV Vout CS1 CS2 COMP Pd Top Tstg Limit -0.3 to +40.0 +0.3 to -40.0 +0.3 to -40.0 -0.3 to +7.0 -0.3 to +7.0 -0.3 to +7.0 -0.3 to +7.0 0.75 -40 to +85 -60 to 150 Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used. 8-1 Unit V V V V V V V W °C °C Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller ■Selection guide ELM652DA-N Symbol a b c Package Product version Taping direction ELM652DA - N ↑↑ ↑ ab c D: SOP-8 A N: Refer to PKG file * Taping direction is one way. ■Pin configuration SOP-8(TOP VIEW) 1 8 2 7 3 6 4 5 Pin No. 1 2 3 4 5 6 7 8 Pin name GND CS1 CS2 PDRV NDRV VCC VOUT COMP Pin description Graund 1st channel current sense input 2Nd channel current sense input PMOSFET driver output NMOSFET driver output The input supply voltage The output voltage regulation feedback The E/A output pin for compensation ■Standard circuit Q1 U 6 Vin 8 C1 + 5 R1 C2 1 C3 VCC PDRV COMP CS1 NDRV CS2 GND L 4 Vout 2 3 C4 VOUT 7 R2 ELM652DA Q2 8-2 R3 GND1 GND2 Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller ■Block diagram COMP 8 VOUT 6 5.8V PDRV VCC 7 Reference Generator + 4 OTP RAMP 5.1V + Error + Amp. - - Control logic PWM Comp. NGate DRV Soft start + Current Amp. 2.0V Vss - PGate DRV + 112mV + 1 3 2 5 GND CS2 CS1 NDRV ■Functional descriptions 1. Dual-channeling CV/CC mode control ELM652DA provides dual channeling CV/CC function. The CV (constant voltage) function is implemented to deliver a regulated output voltage for the output terminal, and the dual-channeling CC (constant current) function is to limit dual-port output current to be a limited value to prevent the device damaged due to output short circuit or over current condition. 2. Soft Start function ELM652DA is composed of built-in internal soft start function to prevent a large surge current happening when during start-up period due to the surge current charging output filter capacitors. 3. Output over-voltage protection ELM652DA provides built-in output over-voltage protection function. When output over-voltage happens, the ELM652DA shuts down and recovers to normal state automatically if output over-voltage is released. 4. Output short-circuit protection ELM652DA provides output short-circuit protection function. When output short happens, the ELM652DA shuts down and recovers to normal state automatically if output short-circuit is released. 8-3 Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller ■Electrical characteristics Parameter Input voltage section Input voltage Input no load current Oscillator section Operating frequency Duty cycle range Error amplifier section Reference voltage of the voltage error amplifier Reference voltage of the current error amplifier Symbol Vin=12V, Iout=4.0A, Top=25°C, unless otherwise specified Condition Min. Typ. Max. Unit Vin Ino-load Iout=0A Tran conductance of Error amplifier Fosc Duty Vout Iout=0A Vcs1 Vcs2 8 36 10 V mA 85 115 95 kHz % 5.05 5.10 5.15 V 107.5 112.0 116.5 mV Gmerr 150 µA/V 5.8 V 2.0 V 150 100 °C °C Output over voltage protection section Output over voltage protection Vovp Output short circuit protection section Short circuit fold back voltage Over temperature protection section Thermal shut-down temperature Vscp Totp,r Totp,f Temperature rising Temperature falling ■Marking SOP-8 Mark 652 a to o 8-4 Content Product No.code Assembly lot No. Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller ■Application notes 1. CC current setting The constant current value of ELM652DA is set by R2 resistor and R3 resistor. The output current of CC mode and these resistors are set by the following equations: R2 = 0.112 / IC1 R3 = 0.112 / IC2 2. Input capacitor selection The bulk input capacitor selection is based on the voltage rating, the RMS current carrying capability, and the required input voltage ripple. The capacitor voltage rating is recommended with 1.5 times for the maximum input voltage as conservative guideline, depending on the application condition. The capacitor RMS current rating is considered for stress condition, and the trapezoid current waveform as the simplified formula is described: Irms = Iout(max) * √ ( Vout / Vin ) Vin = input voltage ; Vout = output voltage ; Iout(max) = maximum output current. The capacitor values with respect to the required input voltage ripple if neglect ESR is described: C = Iout(max) * ΔT / ΔV ΔT = capacitor supplied charging time ; ΔV = allowable input voltage ripple. 3. Output inductor selection The output inductor is selected for the trade-offs between the output inductor current ripple, dc resistance for power loss, load transient response time, and the physical size. The output inductor current ripple determines the output voltage ripple requirement, and the inductor’s dc resistance concerns the power loss. The larger the inductor value, the smaller the inductor ripple current, but the slower the transient response time, the larger the inductor dc resistance, and hence the larger the power loss. The inductance value is described: L = Vout * ( 1 - Vout / Vin ) * Tsw / ΔLl Vin = input voltage ; Vout = output voltage ; Tsw = switching period ; ΔLl = inductor ripple current. 4. Output capacitor selection The output capacitor is selected for the trade-offs between output ripple voltage requirement, the output voltage rating, the RMS current rating, the ESR and ESL for the load transient, and the physical size. The capacitor voltage rating is recommended with 1.5 times for the maximum output voltage as conservative guideline. The capacitor RMS current rating is considered for stress condition’ and the trapezoid current waveform as the simplified formula is described: Irms = ΔLl / 2√3 ; ΔLl = inductor ripple current. The output ripple voltage with respect to the capacitor ESR is described: ΔV = ΔI * ( ESR + Tsw / ( 8 * C ) ) ΔI = capacitor ripple current’ which is equivalent to the inductor ripple current ; ESR = capacitor equivalent series resistance ; Tsw = switching period. 8-5 Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller 5. FET selection The FET transistor is selected depend on the application specification. When the input voltage is under 30V like 24V car battery, the following FET is recommended. ELM35603KA is complementary power MOSFET. N-ch:Vds= 40V, Id= 10.0A P-ch:Vds=-40V, Id= -7.0A When the input voltage is under 20V like 12V car battery, the following FET is recommended. ELM35604KA is complementary power MOSFET. N-ch:Vds= 30V, Id= 8.5A P-ch:Vds=-30V, Id= -7.0A 8-6 Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller ■Typical characteristics • Vin=12V, R1=100kΩ, R2=0.1Ω, R3=0.05Ω, NMOS=ELM33410CA, PMOS=ELM34401AA L=100µH, C1=100µF, C2=47nF, C3=47pF, C4=220µF, Top=25°C Iout-Vout 6.000 Iout-Efficiency 100.00 Vin=24V, Iload=2A 90.00 5.000 Vin=12V, Iload=2A Vin=12V, Iload=1A Efficiency (%) Vout (V) 4.000 80.00 3.000 2.000 Vin=24V, Iload=1A 1.000 0.000 0.000 60.00 50.00 40.00 30.00 Vin=12V, Iload=1A Vin=24V, Iload=2A Vin=12V, Iload=2A Vin=24V, Iload=1A 20.00 10.00 0.500 1.000 1.500 Iout (A) Vin-Vout 5.20 2.000 0.00 0.000 2.500 0.500 1.000 1.500 2.000 2.500 Iout (A) Vin-Freq Iload=500mA 110.00 5.15 Iload=500mA 105.00 Freq (kHz) Vout (V) 70.00 5.10 5.05 100.00 95.00 5.00 0 10 20 Vin (V) Vin-Vcs 90.00 0 40 30 20 Vin (V) Vin-Vout Iload=1A 130 10 5.20 30 40 Iload=500mA 125 5.15 Vout (V) Vcs1 (V) 120 115 5.10 110 5.05 105 100 0 5 10 15 20 25 Vin (V) 30 35 5.00 0 40 8-7 10 20 Vin (V) 30 40 Rev.1.1 ELM652DA Dual-channeling CV/CC mode 36V switching controller Top-Freq Top-Vcs Iload=500mA Iload=1A 120 115 Vcs (mV) 100.00 95.00 110 105 90.00 -30 0 30 Top (°C) 60 100 -30 90 0 60 30 Top (°C) 90 Top-Efficiency Iload=500mA 95.00 Efficiency (%) Freq (kHz) 105.00 90.00 85.00 80.00 -30 8-8 0 30 Top (°C) 60 90 Rev.1.1