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2001. Sep. 8
PWM/VFM step-down DC/DC converter with Synchronous Rectifier
R1230D Series
s OUTLINE
The R1230D Series are PWM step-down DC/DC Converters with synchronous rectifier, low supply current by CMOS process. Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM/VFM alternative circuit, a chip enable circuit, and a driver transistor. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. (As for R1230D001C/D types, divider resistors are also necessary.) In terms of Output Voltage, it is fixed internally in the R1230DXX1A/B types. While in the R1230D001C/D types, Output Voltage is adjustable with external divider resistors. PWM/VFM alternative circuit is active with Mode Pin of the R1230D Series. Thus, when the load current is small, the operation can be switching into the VFM operation from PWM operation by the logic of MODE pin and the efficiency at small load current can be improved. As protection circuits, Current Limit circuit which limits peak current of Lx at each clock cycle, and Latch type protection circuit which works if the term of Over-current condition keeps on a certain time in PWM mode exist. Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO.
s FEATURES
q Built-in Driver ON Resistance * * * * * * * * * * * * * P-channel 0.35, N-channel 0.45 (at VIN=3V) q Built-in Soft-start Function (TYP. 1.5ms), and Latch-type Protection Function (Delay Time; TYP. 1.5ms) q Two choices of Oscillator Frequency * * * * * * 500kHz, 800kHz q PWM/VFM alternative with MODE pin * * * * * * PWM operation; MODE pin at "L", VFM operation; MODE pin at "H" q High Efficiency * * * * * * * * * * * * * * * * * * TYP. 90% q Output Voltage * * * * * * * * *Stepwise Setting with a step of 0.1V in the range of 1.2V 4.0V(XX1A/B Type) or adjustable in the range of 0.8V to VIN(001C/D Type) q High Accuracy Output Voltage * * * * * * * * * *2.0%(XX1A/B Type) q Package * * * * * SON8 (Max height 0.9mm, thin type)
s APPLICATIONS
q Power source for portable equipment.
Rev. 1.12
-1-
s BLOCK DIAGRAM
qR1230DXX1A/B
VDD VIN
MODE "L"= PWM
"H"= VFM
OSC
VOUT
Lx
PWM/VFM CONTROL OUTPUT CONTROL
Phase Compensation
Vref
CE UVLO "H" Active Soft Start Chip Enable
Current Protection
CE
PGND
qR1230D001C/D
AGND
VDD MODE
"L"= PWM "H"= VFM
VIN
OSC
VFB
Lx
PWM/VFM CONTROL OUTPUT CONTROL
Phase Compensation
"H" Active
Vref
Chip Enable
CE
Current Protection UVLO
Soft Start
PGND
AGND
Rev. 1.12
-2-
s SELECTION GUIDE
In the R1230D Series, the output voltage, the oscillator frequency, and the taping type for the ICs can be selected at the user's request. The selection can be made by designating the part number as shown below;
R1230DXXXX-XX
a bc d
Code a Contents Setting Output Voltage(VOUT): Stepwise setting with a step of 0.1V in the range of 1.2V to 4.0V is possible for A/B version. "00" is for Output Voltage Adjustable C/D version 1 : fixed Designation of Optional Function A : 500kHz, Fixed Output Voltage B : 800 kHz, Fixed Output Voltage C : 500kHz, Adjustable Output Voltage D : 800kHz, Adjustable Output Voltage Designation of Taping Type; Ex. :TR,TL(refer to Taping Specification) "TR" is prescribed as a standard.
b c
d
s PIN CONFIGURATION
q SON-8
2.90.2 0.48TYP
8
5
(0.2) 2.80.2 3.00.2 * *
1
0.130.05
4
0.9 MAX.
*Attention : Tab suspension leads in the parts have GND level. (They are connected to the reverse side of this IC.) Do not connect to other wires or land patterns.
0.65 0.30.1
0.1 0.1 M
Unit : mm
Rev. 1.12
-3-
(0.2)
s PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 Symbol VIN PGND VDD CE VOUT/VFB MODE AGND Lx Description Voltage Supply Pin Ground Pin Voltage Supply Pin Chip Enable Pin (active with "H") Output/Feedback Pin Mode changer Pin (PWM mode at "L", VFM mode at "H".) Ground Pin Lx Pin
s ABSOLUTE MAXIMUM RATINGS
Symbol VIN VDD VLX VCE VMODE VFB ILX PD Topt Tstg Item VIN Supply Voltage VDD Pin Voltage Lx Pin Voltage CE Pin Input Voltage MODE Pin Input Voltage VFB Pin Input Voltage LX Pin Output Current Power Dissipation Operating Temperature Range Storage Temperature Range (AGND=PGND=0V) Rating Unit 6.5 V 6.5 V V -0.3VIN+0.3 V -0.3VIN+0.3 V -0.3VIN+0.3 V -0.3VIN+0.3 -0.8 A 250 mW C -40+85 C -55+125
Rev. 1.12
-4-
s ELECTRICAL CHARACTERISTICS
qR1230D**1A/B Symbol Item VIN Operating Input Voltage VOUT Step-down Output Voltage VOUT/ T fosc fosc IDD IDD Istb RONP Step-down Output Voltage Temperature Coefficient Oscillator Frequency(xx1A) Oscillator Frequency(xx1B) Supply Current(xx1A) Supply Current(xx1B) Conditions VIN=VCE=VSET+1.5V, VMODE=0V, IOUT=10mA -40C Topt 85C VIN=VCE=VSET+1.5V VIN=VCE=VSET+1.5V VIN=VCE=VSET+1.5V, VOUT=VMODE=0V VIN=VCE=VSET+1.5V, VOUT=VMODE=0V VIN=5.5V, VCE=VOUT=0V VIN=5.0V VIN=5.0V VIN=5.5V, VCE=0V, VLX=0V/5.5V VIN=5.5V, VCE=0V, VLX=0V/5.5V VIN=5.5V, VMODE=0V, VCE=5.5V/0V VIN=5.5V, VOUT=0V VIN=2.4V, VOUT=0V VMODE=0V VMODE= VOUT=0V, VIN=VCE=3.0V MIN. 2.4 TYP.x 0.980 (Topt=25C) MAX. Unit 5.5 V VSET TYP.x V 1.020 ppm 150 /C 500 575 kHz 800 920 kHz 230 300 A TYP. 250 0 0.35 0.45 0.0 0.0 0.0 350 5 0.60 0.70 0.1 0.1 0.1 A A A A A V V % V ms ms V V A V V %
425 680
Standby Current ON Resistance of Pch Transistor RONN ON Resistance of Nch Transistor ILXleak Lx Leakage Current IVOUT VOUT Leakage Current ICE CE Input Current VCEH CE "H" Input Voltage VCEL CE "L" Input Voltage Maxdty Oscillator Maximum Duty Cycle VLX Lx Limit Voltage Tstart Tprot VUVLO1 VUVLO2 IMODE VMODEH VMODEL VFMdty
0.20 0.20 -0.1 -0.1 -0.1 1.5
Delay Time by Soft-Start function at no load, VIN=VCE=VSET+1.5V Delay Time for protection circuit VIN=VCE=VSET+1.5V, VMODE=0V
UVLO Threshold Voltage UVLO Released Voltage MODE Pin Input Current MODE "H" Input Voltage MODE "L" Input Voltage VFM Duty Cycle
VIN=VCE=2.5V->1.5V, VOUT=0V VIN=VCE=1.5V->2.5V, VOUT=0V VIN=5.5V, VCE=0V, VMODE=5.5V/0V VIN=VCE=5.5V, VOUT=0V VIN=VCE=2.4V, VOUT=0V VIN=VCE= VMODE=2.4V, VOUT=0V
0.3 100 VIN-0.15 VIN-0.35 VIN0.55 0.5 1.5 2.5 0.5 1.5 2.5 1.8 2.1 2.2 1.9 2.2 2.3 -0.1 0.1 1.5 0.3 55 65 85
Rev. 1.12
-5-
qR1230D001C/D Symbol Item VIN Operating Input Voltage VFB Feedback Voltage Feedback Voltage Temperature Coefficient Oscillator Frequency(xx1C) Oscillator Frequency(xx1D) Supply Current(xx1C) Supply Current(xx1D) Standby Current ON Resistance of Pch Transistor RONN ON Resistance of Nch Transistor ILXleak Lx Leakage Current IVFB VFB Leakage Current ICE CE Input Current VCEH CE "H" Input Voltage VCEL CE "L" Input Voltage Maxdty Oscillator Maximum Duty Cycle VLX Lx Limit Voltage Tstart Tprot VUVLO1 VUVLO2 IMODE VMODE VMODEL VFMdty VFB/ T fosc fosc IDD IDD Istb RONP
Conditions VIN=VCE=VSET+1.5V, VMODE=0V, IOUT=10mA -40C Topt 85C VIN=VCE=VSET+1.5V VIN=VCE=VSET+1.5V VIN=VCE=5.5V, VFB=VMODE=0V VIN=VCE=5.5V, VFB=VMODE=0V VIN=5.5V, VCE=VFB=0V VIN=5.0V VIN=5.0V VIN=5.5V, VCE=0V, VLX=0V/5.5V VIN=5.5V, VCE=0V, VFB=0V/5.5V VIN=5.5V, VMODE=0V, VCE=5.5V/0V VIN=5.5V, VFB=0V VIN=2.4V, VFB=0V VMODE=0V VIN=VCE=3.0V, VMODE=0V, VFB=0V
MIN. 2.4 0.776
TYP. 0.800 150
(Topt=25C) MAX. Unit 5.5 V 0.824 V ppm /C 575 kHz 920 kHz 300 A 350 A 5 A 0.60 0.70 0.1 0.1 0.1 0.3 A A A V V % V ms ms V V A V V %
425 680
0.20 0.20 -0.1 -0.1 -0.1 1.5 100 VIN-0.15 0.5 1.8 1.9 -0.1 1.5 55
500 800 230 250 0 0.35 0.45 0.0 0.0 0.0
Delay Time by Soft-Start function at no load, VIN=VCE=VSET+1.5V Delay Time for protection circuit VIN=VCE=3.6V, VMODE=0V
UVLO Threshold Voltage UVLO Released Voltage MODE Pin Input Current MODE "H" Input Voltage MODE "L" Input Voltage VFM Duty Cycle
VIN=VCE=2.5V->1.5V, VFB=0V VIN=VCE=1.5V->2.5V, VFB=0V VIN=5.5V, VMODE=5.5V/0V, VCE=0V VIN=VCE=5.5V, VFB=0V VIN=VCE=2.4V, VFB=0V VIN=VCE=VMODE=2.4V, VFB=0V
VIN0.35 1.5 1.5 2.1 2.2
VIN0.55 2.5 2.2 2.3 0.1 0.3 85
65
Rev. 1.12
-6-
s TEST CIRCUITS
VIN VDD CE AGND VOUT Lx VIN VDD Lx CE VOUT OSCILLOSCOPE
A
PGND MODE
AGND PGND MODE
Test Circuit for Input Current and Leakage Current
Test Circuit for Input Voltage and UVLO voltage
OSCILLOSCOPE VIN VDD Lx CE V AGND
OUT
V OUT
L 10uF
PGND MODE
Test Circuit for Output Voltage, Oscillator Frequency, Soft-Starting Time
VIN
Lx CE OSCILLOSCOPE V
IN
A
VDD
Lx CE
AGND
VOUT
VDD
A
PGND MODE AGND PGND MODE VOUT
Test Circuit for Supply Current and Standby Current
Test Circuit for ON resistance of Lx, Limit Voltage, Delay Time of Protection Circuit
The bypass capacitor between Power Supply and GND is Ceramic capacitor 10F.
Rev. 1.12
-7-
s TYPICAL APPLICATION AND TECHNICAL NOTES
1) Fixed Output Voltage Type
VOUT
VIN CIN PGND VDD CE Lx AGND MODE VOUT COUT L
LOAD
L : 10H LQH3C100K54(Murata) COUT : 10F ECSTOJX106R(Panasonic) CIN : 10F C3216JB0J106M(TDK) 2) Adjustable Output Voltage Type
L VIN CIN PGND VDD CE LX AGND MODE VFB Rb R2 Cb R1 COUT
VOUT
LOAD
L: COUT: CIN:
10H LQH3C100K54 (Murata) 10F ECSTOJX106R (Panasonic) 10F C3216JB0J106M (TDK)
Standard value of the sum of Divider Resistors, R1+R2 is as much as 100k. Cb value for phase compensation depends on values of L, C, and R1. Refer to the technical notes. If a ceramic capacitor is used as an output capacitor, add 0.2 or more resistance to compensate the ESR of the capacitor. When you use these ICs, consider the following issues; q Input same voltage into Power Supply pins, VIN and VDD. Set the same level as AGND and PGND. q When you control the CE pin and MODE pin by another power supply, do not make its "H" level more than the voltage level of VIN / VDD pin. q Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the wiring to VIN pin and PGND pin. q At stand by mode, (CE="L"), the Lx output is Hi-Z, or both P-channel transistor and N-channel transistor of Lx pin turn off. q Use an external capacitor COUT with a capacity of 10F or more, and with good high frequency characteristics such as tantalum capacitors. q At VFM mode, (MODE="H"), Latch protection circuit does not operate.
Rev. 1.12
-8-
q q
If the mode is switched over into PWM mode from VFM mode during the operation, change the mode at light load current. If the load current us large, output voltage may decline. Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the impedance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the switching current, and the operation might be unstable.
The performance of power source circuits using these ICs extremely depends upon the peripheral circuits. Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their respected rated values.
s OPERATION of step-down DC/DC converter and Output Current
The step-down DC/DC converter charges energy in the inductor when Lx transistor is ON, and discharges the energy from the inductor when Lx transistor is OFF and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams:
i1 IOUT VIN Pch Tr Nch Tr L i2 CL VOUT
ILmax ILmin topen
ton T=1/fosc
toff
Step 1: Step 2: Step 3:
P-channel Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases from ILmin(=0) to reach ILmax in proportion to the on-time period(ton) of P-channel Tr. When P-channel Tr. turns off, Synchronous rectifier N-channel Tr. turns on in order that L maintains IL at ILmax, and current IL (=i2) flows. IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and N-channel Tr. turns off. Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not enough. In this case, IL value increases from this ILmin(>0).
In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with the oscillator frequency (fosc) being maintained constant. q Discontinuous Conduction Mode and Continuous Conduction Mode The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the same as those when P-channel Tr. turns on and off. The difference between ILmax and ILmin, which is represented by I; I = ILmax - ILmin = VOUT x topen / L = (VIN-VOUT)xton/LEquation 1 Wherein T=1/fosc=ton+toff duty (%)=ton/Tx100=tonxfoscx100 topen toff In Equation 1, VOUTxtopen/L and (VIN-VOUT)xton/L respectively show the change of the current at "ON", and the change of the current at "OFF". When the output current (IOUT) is relatively small, topen0). The former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, Rev. 1.12 -9-
tonc =TxVIN/VOUT Equation 2 When tons OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When P-channel Tr. of Lx is ON: (Wherein, Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. and N-channel Tr. of Lx are respectively described as Ronp and Ronn, and the DC resistor of the inductor is described as RL.) VIN=VOUT+(Ronp+RL)xIOUT+LxIRP/ton When P-channel Tr. of Lx is "OFF"(N-channel Tr. is "ON"): LxIRP/toff = RLxIOUT + VOUT + RonnxIOUT Equation 3 Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, ton/(toff+ton)=DON, DON=(VOUT-RonnxIOUT+RLxIOUT)/(VIN+ RonnxIOUT -RonpxIOUT)Equation 5 Ripple Current is as follows; ...Equation 6 IRP=(VIN-VOUT-RonpxIOUT-RLxIOUT)xDON/fosc/L wherein, peak current that flows through L, and Lx Tr. is as follows; ILmax=IOUT+IRP/2 ...Equation 7
Consider ILmax, condition of input and output and select external components. 5The above explanation is directed to the calculation in an ideal case in continuous mode.
s How to Adjust Output Voltage and about Phase Compensation
As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 0.8V. Output Voltage, VOUT is as following equation; VOUT: R1+R2=VFB: R2 VOUT=VFBx(R1+R2)/R2 Thus, with changing the value of R1 and R2, output voltage can be set in the specified range. In the DC/DC converter, with the load current and external components such as L and C, phase might be behind 180 degree. In this case, the phase margin of the system will be less and stability will be worse. To prevent this, phase margin should be secured with proceeding the phase. A zero is formed with R1, R2, and Cb. Fpole1/2LCOUT Fzero1/(2x(R1+R2)xCb) Considering external components, LC, set the appropriate value of R1+R2 and Cb. Rb is effective for reducing the noise on VFB, therefore, add Rb so that R1+Rb=30k. When the R130k, additional Rb is not necessary, so it should be wired to VFB directly.
s External Components
1. Inductor Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows, magnetic saturation occurs and make transform efficiency worse. Supposed that the load current is at the same, the smaller value of L is used, the larger the ripple current is. Provided that the allowable current is large in that case and DC current is small, therefore, for large output current, efficiency is better than using an inductor with a large value of L and vice versa. 2. Capacitor
Rev. 1.12
- 10 -
As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least 10F for stable operation. COUT can reduce ripple of Output Voltage, therefore as much as 10F tantalum type is recommended.
s TIMING CHART
CE pin Voltage Internal Soft-start Internal Operational Amplifier Output Set Voltage Output Short Output Short
Internal Oscillator Waveform Lx Pin Output Latched Delay Time of Protection Soft-start Time Stable
The timing chart as shown above describes the waveforms starting from the IC is enabled with CE and latched with protection. During the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of Lx is gradually wider and wider to prevent the over-shoot of the voltage. During the term, the output of amplifier is "H", then after the output voltage reaches the set output voltage, they are balanced with the stable state. Herein, if the output pin would be short circuit, the output of amplifier would become "H" again, and the condition would continue for 1.5ms (TYP.), latch circuit would work and the output of Lx would be latched with "OFF". (Output ="High-Z") If the output short is released before the latch circuit works (within 1.5ms after output shorted), the output of amplifier is balanced in the stable state again. Once the IC is latched, to release the protection, input "L" with CE pin, or make the supply voltage at UVLO level or less.
s TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
1.9 1.88 1.86 1.84 1.82 1.8 1.78 1.76 1.74 1.72 1.7 1 10 100 1000
Output Voltage VOUT[mA]
R1230D181A Vin=3.3V PWM Vin=3.3V VFM Vin=5.0V PWM Vin=5.0V VFM
Output Current IOUT[mA]
Rev. 1.12
- 11 -
1.9 1.88 1.86 1.84 1.82 1.8 1.78 1.76 1.74 1.72 1.7 1 10 100 1000
R1230D181B Vin=3.3V PWM Vin=3.3V VFM Vin=5.0V PWM Vin=5.0V VFM
Output Voltage VOUT[V]
Output Current IOUT[mA]
2.6 R1230D251B Vin=3.3V PWM Vin=3.3V VFM 2.5 2.45 2.4 1 10 Output Current IOUT[mA] 100 1000 Vin=5.0V PWM Vin=5.0V VFM
Output Voltage V OUT[V]
2.55
2) Efficiency vs. Output Current
100 90 80 70 60 50 40 30 20 10 0 1 10 Output Current IOUT[mA] 100 90 80 70 60 50 40 30 20 10 0 1 10 Output Current IOUT[mA] 100 1000 100 1000 R1230D181A Vin=3.3V PWM Vin=3.3V VFM Vin=5.0V PWM Vin=5.0V VFM
Efficiency [%]
R1230D181B Vin=3.3V PWM Vin=3.3V VFM Vin=5.0V PWM Vin=5.0V VFM
Rev. 1.12
Efficiency [%]
- 12 -
100 90 80 70 60 50 40 30 20 10 0 1 10
R1230D251B Vin=3.3V PWM Vin=3.3V VFM Vin=5.0V PWM Vin=5.0V VFM
Efficiency[%]
Output Current IOUT[mA]
100
1000
3) Ripple Voltage vs. Output Current
COUT=10uF Tantalum Capacitor ESR=400mohm 0.06 Output Ripple Voltage Vripple[V] 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -1.00E-06 0.00E+00 PWM Mode
80 Output Ripple Voltage Vripple[V] 70 60 50 40 30 20 10 0 0 50 100 150 200 250 300 350 400 450 R1230D181B 500 VIN=5.0V VIN=3.3V
R1230D181A
1.00E-06
2.00E-06
3.00E-06
4.00E-06 Time [sec]
5.00E-06
6.00E-06
7.00E-06
8.00E-06
VIN=5.0V IOUT=200mA
COUT=10F Tantalum Capacitor ESR=400m
Output Current IOUT[mA]
COUT=10uF Ceramic Capacitor ESR=220mohm 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -1.00E-06 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06 PWM Mode Time [sec]
R1230D181B
Output Ripple Voltage Vripple[V]
5.00E-06
6.00E-06
7.00E-06
8.00E-06
VIN=5.0V IOUT=200mA
Rev. 1.12
- 13 -
4) Output Waveform
COUT=10uF Tantalum Capacitor ESR=400mohm 0.05 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -4.00E-06 -3.00E-06 -2.00E-06 -1.00E-06 PWM Mode R1230D181B AC Output Voltage VAC[V]
0.00E+00 Time[sec]
1.00E-06
2.00E-06
3.00E-06
4.00E-06
VIN=5.0V IOUT=10mA
COUT=10uF Tantalum Capacitor ESR=400mohm 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 -0.06 -4.00E-06 -3.00E-06 -2.00E-06 -1.00E-06 0.00E+00 PWM Mode Time[sec]
R1230D181B
AC Output Voltage V AC[V]
1.00E-06
2.00E-06 3.00E-06 VIN=5.0V IOUT=100mA
4.00E-06
5) Output Voltage vs. Input Voltage
R1230D181B IOUT=20mA 1.9 Output Voltage VOUT[V] 1.85 1.8 1.75 1.7 2 2.5 3 3.5 4 Input Voltage VIN[V] 4.5 5 5.5 6 PWM
VFM
6) Output Voltage vs. Temperature
R1230D181B IOUT=100mA 1.9 1.88 1.86 1.84 1.82 1.8 1.78 1.76 1.74 1.72 1.7 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100 Output Voltage VOUT[V]
Rev. 1.12
- 14 -
R1230D001C/D IOUT=100mA 0.9 Output Voltage VOUT[V] 0.85 0.8 0.75 0.7 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100
7) Oscillator Frequency vs. Temperature
1000 Frequency fOSC[kHz] 900 800 700 600 500 400 300 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 VIN=VOUT+1.5V 100
8) Supply Current vs. Temperature
450 Supply Current Iss[uA] 380 310 800kHz 240 170 100 -60 -40 -20 0 20 40 Temperature Topt (C) 60 VIN=5.5V 80 100 500kHz
9) Soft-start time vs. Temperature
R1230D181B VIN=3.3V 3 Soft-start Time Tsoft[ms] 2.4 1.8 1.2 0.6 0 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100 800kHz
500kHz
Rev. 1.12
- 15 -
10) Delay Time for protection vs. Temperature
3 Delay Time for Protection Circuit Tprc[ms] 2.4 1.8 1.2 0.6 0 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100
11) UVLO Threshold/Released Voltage vs. Temperature
2.3 2.25 2.2 2.15 2.1 2.05 2 1.95 1.9 1.85 1.8 -60 -40
VDD Voltage level[V]
UVLO Released Voltage UVLO Detector Threshold
-20
0
20 40 Temperature Topt (C)
60
80
100
12) CE Pin Input Voltage vs. Temperature
1.6 CE Input Voltage V CE[V] 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100
CEL CEH
13) Mode Pin Input Voltage vs. Temperature
1.6 MODE Input Voltage VMODE[V] 1.4 1.2 1
MODEL
0.8 0.6 0.4 0.2 0 -60 -40 -20 0
MODEH
20 40 Temperature Topt (C)
60
80
100
Rev. 1.12
- 16 -
14) Duty Cycle at VFM Mode vs. Temperature
80 Duty Cycle at VFM Mode[%] 75 70 65 60 55 50 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100
15) Lx Transistor On Resistance vs. Temperature
VIN=3.0V ON Resistance Ron[Ohm] 1 0.75 Nch Tr. On Resistance 0.5 0.25 0 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100 Pch Tr. On Resistance
16) Limit Voltage vs. Temperature
0.5 Limit Voltage Vlimit[V] 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 -60 -40 -20 0 20 40 Temperature Topt (C) 60 80 100
17) Load Transient Response
Load Current 100mA/div IOUT=100mA IOUT=0A 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -4.00E-05 -2.00E-05 0.00E+00 2.00E-05 4.00E-05 6.00E-05 Time[sec] 8.00E-05 1.00E-04 1.20E-04 1.40E-04 R1230D181B VIN=5.0V PWM
Rev. 1.12
- 17 -
AC Output VAC[V]
IOUT=200mA Load Current100mA/div IOUT=0A
0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1.20E-04 1.40E-04
-4.00E-05
-2.00E-05
0.00E+00
2.00E-05
4.00E-05
6.00E-05 Time[sec]
8.00E-05
1.00E-04
R1230D181B VIN=5.0V PWM
Load Current 100mA/div
IOUT=0A IOUT=100mA
-4.00E-06
1.00E-06
6.00E-06
1.10E-05
1.60E-05 Time [sec]
2.10E-05
2.60E-05 3.10E-05 R1230D181B VIN=5.0V PWM
0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 3.60E-05
IOUT=2mA
-0.0002
-0.0001
0
0.0001
0.0002
0.0003 Time [sec]
0.0004
0.0005
0.0006
0.0007
R1230D181B VIN=5.0V PWM 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 3.60E-05
IOUT=200mA Load Current 100mA/div IOUT=0A
-4.00E-06
1.00E-06
6.00E-06
1.10E-05
1.60E-05 Time[sec]
2.10E-05
2.60E-05 3.10E-05 R1230D181B VIN=5.0V PWM
Rev. 1.12
- 18 -
AC Output Voltage VAC[V]
AC Output Voltage VAC[V]
IOUT=100mA
0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 0.0008
Load Current 100mA/div
AC Output Voltage VAC[V]
Output Voltage VAC[V]
IOUT=200mA IOUT=2mA Load Current 100mA/div 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 0.0008 AC Output Voltage VAC[V] CE Input Voltage VCE[V]
-0.0002
-0.0001
0
0.0001
0.0002
0.0003 Time [sec]
0.0004
0.0005
0.0006
0.0007
R1230D181B VIN=5.0V PWM
18) Turn-on Waveform
5 PWM Mode IOUT=0A 4 2 CE 0 -2 -4 VOUT -6 -8 -10 0 0.0004 0.0008 0.0012 0.0016 Time [sec] 0.002 0.0024 R1230D181B VIN=5.0V PWM ModeIOUT=50mA 4 3 2 1 0 -1 -0.0004 0 0.0004 0.0008 0.0012 Time [sec] 0.0016 0.002 0.0024 R1230D181B VIN=5.0V 0.0028 VOUT CE 2 0 -2 -4 -6 -8 -10 0.0028 CE Input Voltage VCE[V]
Output Voltage VOUT[V]
4 3 2 1 0 -1 -0.0004
PWM ModeIOUT=200mA Output Voltage VOUT[V] 5 4 3 2 1 0 -1 -0.0004 0 0.0004 0.0008 0.0012 Time [sec] 0.0016 0.002 0.0024 0.0028 VOUT CE 4 2 0 -2 -4 -6 -8 -10 R1230D181B VIN=5.0V
Rev. 1.12
- 19 -
CE Input Voltage VCE[V]
Output Voltage VOUT[V]
5
4
VFM Mode IOUT=0A 4 3 2 1 0 -1 -0.0004 0 0.0004 0.0008 0.0012 Time [sec] 0.0016 0.002 0.0024 0.0028 VOUT CE 2 0 -2 -4 -6 -8 -10 R1230D181B VIN=5.0V CE Input Voltage VCE(V) CE Input Voltage VCE[V] Output Voltage VOUT[V] 5 4
VFM Mode IOUT=50mA Output Voltage VOUT[V] 5 4 3 2 1 0 -1 -0.0004 0 0.0004 0.0008 0.0012 Time [sec] 0.0016 0.002 0.0024 0.0028 VOUT CE 4 2 0 -2 -4 -6 -8 -10 R1230D181B VIN=5.0V
Rev. 1.12
- 20 -

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