R1223N502H [RICOH]
PWM/VFM Step-down DC/DC Converter; PWM / VFM降压型DC / DC转换器
| 型号： | R1223N502H |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | PWM/VFM Step-down DC/DC Converter |
| 文件： | 总19页 (文件大小：208K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
‘99.12.8
PWM/VFM step-down DC/DC Converter
R1223N Series
12345
n OUTLINE
The R1223N Series are PWM step-down DC/DC Converter controllers with 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, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, and resistors for
voltage detection. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC
with only four external components, or a power-transistor, an inductor, a diode and a capacitor.
With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching
into the VFM oscillator from PWM oscillator, therefore the efficiency at small load current is improved. The
R1223N XXXB type, which is without a PWM/VFM alternative circuit, is also available.
If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. There are
two types of protection function. One is latch-type protection circuit, and it works to latch an external Power
MOSFET 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. The other is Reset-type protection circuit, and it works to
restart the operation with soft-start and repeat this operation until maximum duty cycle condition is released.
Either of these protection circuits can be designated by users’ request.
n FEATURES
l Range of Input Voltage · · · · · · · · · · · · ·2.3V~13.2V
l Built-in Soft-start Function and Two choices of Protection Function (Latch-type or Reset type)
l Two choices of Oscillator Frequency · · · · · ·300kHz, 500kHz
l High Efficiency · · · · · · · · · · · · · · · · · ·TYP. 90%
l Output Voltage · · · · · · · · · · · · · · · · · Stepwise Setting with a step of 0.1V
in the range of 1.5V ~ 5.0V
l Standby Current · · · · · · · · · · · · · · · · ·TYP. 0µA
l High Accuracy Output Voltage · · · · · · · · · ·±2.0%
l Low Temperature-Drift Coefficient of Output Voltage · · · · · TYP. ±100ppm/°C
n APPLICATIONS
l Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
camcorders.
l Power source for battery-powered equipment.
l Power source for household electrical appliances.
12345
Rev. 1.11
- 1 -
n BLOCK DIAGRAM
OSC
VOUT
VIN
Vref
EXT
Protection
PWM/VFM
CONTROL
Soft Start
CE
Chip Enable
GND
n SELECTION GUIDE
In the R1223N Series, the output voltage, the oscillator frequency, the optional function, 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;
R1223NXXXX-XX
• • •
•
a b c d
Code
a
Contents
Setting Output Voltage(VOUT):
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.
Designation of Oscillator Frequency
2 : fixed
b
c
Designation of Optional Function
A : 300kHz, with a PWM/VFM alternative circuit, Latch-type protection
B : 500 kHz, with a PWM/VFM alternative circuit, Latch-type protection
C : 300kHz, without a PWM/VFM alternative circuit, Latch-type protection
D : 500kHz, without a PWM/VFM alternative circuit, Latch-type protection
E : 300kHz, with a PWM/VFM alternative circuit, Reset-type protection
F : 500 kHz, with a PWM/VFM alternative circuit, Reset-type protection
G : 300kHz, without a PWM/VFM alternative circuit, Reset-type protection
H : 500kHz, without a PWM/VFM alternative circuit, Reset-type protection
Designation of Taping Type; Ex. :TR,TL(refer to Taping Specification)
”TR” is prescribed as a standard.
d
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Rev. 1.11
- 2 -
n PIN CONFIGURATION
l SOT-23-5
4
5
VIN
EXT
(mark side)
CE GND VOUT
3
1
2
n PIN DESCRIPTION
Pin No.
Symbol
CE
Description
1
2
3
4
5
Chip Enable Pin
Ground Pin
GND
V
OUT
Pin for Monitoring Output Voltage
External Transistor Drive Pin
Power Supply Pin
EXT
V
IN
n ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Supply Voltage
Rating
15
Unit
V
V
IN
V
IN
V
EXT Pin Output Voltage
CE Pin Input Voltage
-0.3~V +0.3
V
EXT
IN
V
-0.3~V +0.3
V
CE
IN
V
V
Pin Input Voltage
-0.3~V +0.3
V
OUT
EXT
OUT
IN
I
EXT Pin Inductor Drive Output Current
Power Dissipation
±25
250
mA
mW
°C
°C
PD
Topt
Tstg
Operating Temperature Range
Storage Temperature Range
-40~+85
-55~+125
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Rev. 1.11
- 3 -
n ELECTRICAL CHARACTERISTICS
lR1223N**2A(,C,E,G) Output Voltage : Vo
(Topt=25°C)
Symbol
Item
Conditions
MIN.
2.3
TYP. MAX. Unit
V
IN
Operating Input Voltage
Step-down Output Voltage
13.2
Vo´
1.02
V
V
V
OUT
V =V =Vo+1.2V,I =-10mA
OUT
Vo´
0.98
Vo
IN
CE
DV
/
Step-down Output Voltage
Temperature Coefficient
Oscillator Frequency
Oscillator Frequency
Temperature Coefficient
Supply Current1
-40°C £ Topt £ 85°C
±100
ppm
OUT
DT
/°C
fosc
V =V =Vo+1.2V,I =-100mA
OUT
240
300
360 kHz
%
IN
CE
Df
/
-40°C £ Topt £ 85°C
±0.3
OSC
DT
/°C
I
V =13.2V,V =13.2V,V =13.2V
OUT
100
0
160 mA
DD1
IN
CE
I
stb
Standby Current
V =13.2V,V =0V,V =0V
OUT
0.5
-6
mA
mA
mA
mA
mA
V
IN
CE
I
EXT "H" Output Current
EXT "L" Output Current
CE "H" Input Current
CE "L" Input Current
CE "H" Input Voltage
CE "L" Input Voltage
V =8V,V
=7.9V,V
=0.1V,V
=8V,V =8V
-10
20
0
EXTH
IN
EXT
EXT
OUT
CE
I
V =8V,V
IN
=0V,V =8V
10
EXTL
OUT
CE
I
V =13.2V,V =13.2V,V
=13.2V
0.5
1.2
CEH
IN
CE
OUT
I
V =13.2V,V =0V,V
=13.2V
-0.5
0
CEL
IN
CE
OUT
V
CEH
V =8V,V
=0V®1.5V
=1.5V®0V
0.8
0.8
IN
OUT
V
CEL
V =8V,V
0.3
V
IN
OUT
Maxdty Oscillator Maximum Duty Cycle
VFMdty VFM Duty Cycle
100
%
only for A, E version
25
10
%
T
Delay Time by Soft-Start function V = Vo+1.2V, V =0V®Vo+1.2V
5
1
16
5
ms
start
IN
CE
specified at 80% for rising edge
T
Delay Time for protection circuit
V =V =Vo+1.2V
3
ms
prot
IN
CE
V
OUT
= Vo+1.2V®0V
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Rev. 1.11
- 4 -
lR1223N**2B(,D,F,H) Output Voltage : Vo
(Topt=25°C)
Symbol
Item
Conditions
MIN.
2.3
TYP. MAX. Unit
V
IN
Operating Input Voltage
Step-down Output Voltage
13.2
Vo´
1.02
V
V
V
OUT
V =V =Vo+1.2V,I =-10mA
OUT
Vo´
0.98
Vo
IN
CE
DV
/
Step-down Output Voltage
Temperature Coefficient
Oscillator Frequency
Oscillator Frequency
Temperature Coefficient
Supply Current1
-40°C £ Topt £ 85°C
±100
ppm
OUT
DT
/°C
fosc
V =V =Vo+1.2V,I =-100mA
OUT
400
500
600 kHz
%
IN
CE
Df
/
-40°C £ Topt £ 85°C
±0.3
OSC
DT
/°C
I
V =13.2V,V =13.2V,V =13.2V
OUT
140
0
200 mA
DD1
IN
CE
I
stb
Standby Current
V =13.2V,V =0V,V =0V
OUT
0.5
-6
mA
mA
mA
mA
mA
V
IN
CE
I
EXT "H" Output Current
EXT "L" Output Current
CE "H" Input Current
CE "L" Input Current
CE "H" Input Voltage
CE "L" Input Voltage
V =8V,V
=7.9V,V
=0.1V,V
=8V,V =8V
-10
20
0
EXTH
IN
EXT
EXT
OUT
CE
I
V =8V,V
IN
=0V,V =8V
10
EXTL
OUT
CE
I
V =13.2V,V =13.2V,V
=13.2V
0.5
1.2
CEH
IN
CE
OUT
I
V =13.2V,V =0V,V
=13.2V
-0.5
0
CEL
IN
CE
OUT
V
CEH
V =8V,V
=0V®1.5V
=1.5V®0V
0.8
0.8
IN
OUT
V
CEL
V =8V,V
0.3
V
IN
OUT
Maxdty Oscillator Maximum Duty Cycle
VFMdty VFM Duty Cycle
100
%
only for B, F version
25
6
%
T
Delay Time by Soft-Start function V = Vo+1.2V, V =0V® Vo+1.2V
3
1
10
4
ms
start
IN
CE
specified at 80% for rising edge
T
Delay Time for protection circuit
V =V =Vo+1.2V
2
ms
prot
IN
CE
V
OUT
= Vo+1.2V®0V
12345
Rev. 1.11
- 5 -
n TEST CIRCUITS
A)
E)
F)
L
PMOS
5
1
4
3
2
5
1
4
3
2
V
VIN
SD
CL
A
VIN
CIN
L
PMOS
OSCILLOSCOPE
B)
5
4
3
2
V
A
5
1
4
3
2
CIN
SD
CL
VIN
1
VIN
CIN
OSCILLOSCOPE
C)
G)
A
5
1
4
3
2
OSCILLOSCOPE
5
4
3
VIN
VOUT
VIN
1
2
A
D)
VEXT
5
4
3
VIN
VOUT
1
2
The typical characteristics were obtained by use of these test circuits.
Test Circuit A : Typical characteristics 1), 2), 3), 4), 5), 6), 7)
Test Circuit B : Typical characteristics 8)
Test Circuit C : Standby Current
Test Circuit D : Typical characteristics 12), 13)
Test Circuit E : CE input current “H” and “L”
Test Circuit F : Typical characteristics 9)
Test Circuit G : Typical characteristics 10), 11)
12345
Rev. 1.11
- 6 -
n TYPICAL APPLICATIONS AND APPLICATION HINTS
PMOS
L
EXT
VIN
VOUT
COUT
SD1
CE
Load
CIN
GND
CE CONTROL
PMOS : HAT1020R(Hitachi), Si3443DV(Siliconix)
SD1 : RB491D (Rohm)
L
: CD105(Sumida, 27mH)
COUT : 47mF(Tantalum Type)
CIN
: 10mF52(Tantalum Type)
When you use these ICs, consider the following issues;
l As shown in the block diagram, a parasitic diode is formed in each terminal, each of these diodes is not formed
for load current, therefore do not use it in such a way. When you control the CE pin by another power supply,
do not make its "H" level more than the voltage level of VIN pin.
l The operation of Latch-type protection circuit is as follows;
When the maximum duty cycle continues longer than the delay time for protection circuit, (Refer to the Electrical
Characteristics) the protection circuit works to shut-down Power MOSFET with its latching operation. Therefore
when an input/output voltage difference is small, the protection circuit may work with small load current.
To release the protection latch state, after disable this IC with a chip enable circuit, enable it again, or restart this
IC with power-on. However, in the case of restarting this IC with power-on, after the power supply is turned off, if a
certain amount of charge remains in CIN, or some voltage is forced to VIN from CIN, this IC might not be restarted
even after power-on.
If rising transition speed of supply voltage is too slow, or the time which is required for VIN voltage to reach Output
voltage of DC/DC converter is longer than soft-starting time plus delay time for protection circuit, protection circuit
works before VIN voltage reaches Output voltage of DC/DC converter. To prevent this action, while power supply
voltage is not ready, make this IC be standby mode(CE=”L”), and when the power supply is ready (the voltage level
of VIN is equal or more than the voltage level of VOUT), make it enable(CE=”H”).
l The operation of Reset-type protection circuit is as follows;
When the maximum duty cycle continues longer than the delay time for protection circuit, (Refer to the Electrical
Characteristics) the protection circuit works to restart with soft-start operation. Therefore when an input/output
voltage difference is small, the protection circuit may work with small load current.
l Set external components as close as possible to the IC and minimize the connection between the components
and the IC. In particular, a capacitor should be connected to VOUT pin with the minimum connection. And make
sufficient grounding and reinforce supplying. A large switching current flows through the connection of power
supply, an inductor and the connection of VOUT. If the impedance of the connection of power supply is high, the
voltage level of power supply of the IC fluctuates with the switching current. This may cause unstable operation of
the IC.
l Use capacitors with a capacity of 22mF or more for VOUT pin, and with good high frequency characteristics such
as tantalum capacitors. We recommend you to use capacitors with an allowable voltage which is at least twice as
much as setting output voltage. This is because there may be a case where a spike-shaped high voltage is
generated by an inductor when an external transistor is on and off.
l Choose an inductor that has sufficiently small D.C. resistance and large allowable current and is hard to reach
magnetic saturation. And if the value of inductance of an inductor is extremely small, the ILX may exceed the
absolute maximum rating at the maximum loading.
12345
Rev. 1.11
- 7 -
Use an inductor with appropriate inductance.
l Use a diode of a Schottky type with high switching speed, and also pay attention to its current capacity.
l Do not use this IC under the condition at VIN voltage less than minimum operating voltage.
P 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.
n 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 :
<Basic Circuits>
<Current through L>
i1
ILmax
IOUT
ILmin
topen
L
VIN
Lx Tr
VOUT
i2
SD
CL
ton
toff
T=1/fosc
Step 1 : LxTr 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 LXTr.
Step 2 : When LxTr turns off, Schottky diode(SD) turns on in order that L maintains IL at ILmax, and current IL(=i2)
flows.
Step 3 : IL decreases gradually and reaches ILmin after a time period of topen, and SD 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 is 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.
l Discontinuous Conduction Mode and Continuous Conduction Mode
The maximum value(ILmax) and the minimum value(ILmin) of the current which flows through the inductor are the
same as those when LxTr is ON and when it is OFF.
The difference between ILmax and ILmin, which is represented by DI ;
DI = ILmax – ILmin = VOUT ´ topen / L = (VIN-VOUT)´ton/L×××Equation 1
wherein T=1/fosc=ton+toff
duty(%)=ton/T´100=ton´fosc´100
topen £ toff
In Equation 1, VOUT´topen/L and (VIN-VOUT)´ton/L are 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, topen<toff as illustrated in the above diagram. In this case, the
energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time period
of toff, therefore ILmin becomes to zero(ILmin=0). When Iout is gradually increased, eventually, topen becomes to
toff(topen=toff), and when IOUT is further increased, ILmin becomes larger than zero(ILmin>0). 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,
12345
Rev. 1.11
- 8 -
tonc=T´VIN/VOUT××× Equation 2
When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the continuous mode.
n OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When LxTr is ON:
(Wherein, Ripple Current P-P value is described as IRP, ON resistance of LXTr is described as Rp the direct current
of the inductor is described as RL.)
VIN=VOUT+(Rp+RL)´IOUT+L´IRP/ton
×××Equation 3
When LxTr is OFF:
L´IRP/toff = VF+VOUT+RL´IOUT
×××Equation 4
Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton)=DON,
DON=(VOUT+VF+RL´IOUT)/(VIN+VF-Rp´IOUT)×××Equation 5
Ripple Current is as follows;
IRP=(VIN-VOUT-Rp´IOUT-RL´IOUT)´DON/f/L ¼Equation 6
wherein, peak current that flows through L, LxTr, and SD is as follows;
ILmax=IOUT+IRP/2
¼Equation 7
Consider ILmax, condition of input and output and select external components.
HThe above explanation is directed to the calculation in an ideal case in continuous mode.
n 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.
When the load current is same, the smaller value of L, the larger the ripple current.
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. Diode
Use a diode with low VF (Schottky type is recommended.) and high switching speed.
Reverse voltage rating should be more than VIN and current rating should be equal or more than ILmax.
3. Capacitor
As for CIN, use a capacitor with low ESR(Equivalent Series Resistance) and a capacity of at least 10mF for stable
operation.
COUT can reduce ripple of Output Voltage, therefore 47 to 100mF tantalum type is recommended.
4. Lx Transistor
Pch Power MOS FET is required for this IC.
Its breakdown voltage between gate and source should be a few volt higher than Input Voltage.
In the case of Input Voltage is low, to turn on MOS FET completely, select a MOS FET with low threshold voltage.
If a large load current is necessary for your application and important, choose a MOS FET with low ON resistance
for good efficiency.
If a small load current is mainly necessary for your application, choose a MOS FET with low gate capacity for good
efficiency.
Maximum continuous drain current of MOS FET should be larger than peak current, ILmax.
12345
Rev. 1.11
- 9 -
n TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
L=27uH
R1223N332H
L=27uH
R1223N152H
1.530
1.520
1.510
1.500
1.490
1.480
1.470
3.400
3.380
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
12V
8V
4.5V
13.2V
8V
5V
2.3V
1E-05 0.0001 0.001 0.01
0.1
1
1E-05 0.0001 0.001 0.01
0.1
1
Output Current IOUT(A)
Output Current IOUT(A)
2) Efficiency vs. Output Current
CD104-27uH
Si3443DV
CD104-27uH
R1223N332A(VIN=12V)
Si3443DV
R1223N332A(VIN=4.5V)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
CD104-27uH
Si3443DV
CD104-27uH
Si3443DV
R1223N332B(VIN=4.5V)
R1223N332B(VIN=12V)
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
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Rev. 1.11
- 10 -
CD104-27uH
Si3443DV
CD104-27uH
Si3443DV
R1223N332C(VIN=4.5V)
R1223N332C(VIN=12V)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
CD104-27uH
R1223N502A(VIN=6.0V
CD104-27uH
Si3443DV
R1223N502A(VIN=12V)
Si3443DV
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
CD104-27uH
Si3443DV
(VIN=6.0V)
R1223N502B(VIN=12V)
R1223N502B
CD104-27uH
Si3443DV
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
12345
Rev. 1.11
- 11 -
CD104-27uH
Si3443DV
CD104-27uH
Si3443DV
R1223N502C(VIN=6.0V)
R1223N502C(VIN=12V)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
3) Ripple Voltage vs. Output Current
L=27uH
L=27uH
R1223N502A
R1223N332A
200
180
160
140
120
100
80
200
180
VIN4.5V
VIN6V
VIN8V
VIN12V
160
140
120
100
80
VIN8V
VIN12V
60
60
40
40
20
20
0
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
R1223N332B
L=27uH
L=27uH
R1223N502B
200
180
160
140
120
100
80
200
180
160
140
120
100
80
VIN6V
VIN4.5V
VIN8V
VIN8V
VIN12V
VIN12V
60
60
40
40
20
20
0
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
12345
Rev. 1.11
- 12 -
L=27uH
R1223N332C
R1223N502C
L=27uH
200
180
160
140
120
100
80
200
180
160
140
120
100
80
VIN4.5V
VIN6V
VIN8V
VIN8V
VIN12V
VIN12V
60
60
40
40
20
20
0
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
4) Oscillator Frequency vs. Input Voltage
L=27uH
R1223N152B
R1223N152A
L=27uH
600
500
400
300
200
100
0
600
500
400
300
200
100
0
0
5
10
15
0
5
10
15
Input Voltage VIN(V)
Input Voltage VIN(V)
5) Output Voltage vs. Input Voltage
L=27uH
R1223N152A
R1223N152B
L=27uH
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.53
1.52
1.51
1.50
1.49
1.48
1.47
0
5
10
15
0
5
10
15
Input Voltage VIN(V)
Input Voltage VIN(V)
12345
Rev. 1.11
- 13 -
L=27uH
L=27uH
R1223N332B
R1223N332A
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.36
3.34
3.32
3.30
3.28
3.26
3.24
0
5
10
15
0
5
10
15
Input Voltage VIN(V)
Input Voltage VIN(V)
6) Output Voltage vs. Temperature
L=27uH
VIN=2.7V
L=27uH
VIN=4.5V
R1223N152B
R1223N332H
1.51
1.50
1.49
1.48
1.47
3.33
3.32
3.31
3.30
3.29
3.28
3.27
-50
0
50
100
-50
0
50
100
Temperature Topt
(°C)
(°C)
Temperature Topt
7) Oscillator Frequency vs. Temperature
L=27uH
R1223N252A
L=27uH
VIN=4.5V
R1223N332B
VIN=3.7V
360
340
320
300
280
260
240
600
550
500
450
400
-50
0
50
100
-50
0
50
100
Temperature Topt
Temperature Topt
12345
Rev. 1.11
- 14 -
8) Supply Current vs. Temperature
R1223N332G
R1223N332H
140
130
120
110
100
90
100
90
80
70
60
50
VIN15V
VIN13.2V
VIN8V
VIN15V
VIN13.2V
VIN8V
80
70
60
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
(°C)
Temperature Topt
9) Soft-start time vs. Temperature
R1223N252A
L=27uH
VIN=4.5V
L=27uH
VIN=3.7V
R1223N332B
10
8
16
14
12
10
8
6
4
6
4
2
2
0
0
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
Temperature Topt
(°C)
10) Delay Time for Latch-type protection vs. Temperature
VIN=3.7V
VIN=4.5
R1223N332B
R1223N252A
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
Temperature Topt
(°C)
12345
Rev. 1.11
- 15 -
11) Delay Time for Reset-type Protection vs. Temperature
R1223N332G
VIN=4.5V
VIN=4.5V
R1223N332H
5
4
3
2
1
0
5
4
3
2
1
0
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
Temperature Topt(°C)
12) EXT "H" Output Current vs. Temperature
R1223N332B
16
14
12
10
8
6
4
2
0
-50
0
50
(°C)
100
Temperature Topt
13) EXT"L" Output Current vs. Temperature
R1223N332B
30
25
20
15
10
5
0
-50
0
50
(°C)
100
Temperature Topt
12345
Rev. 1.11
- 16 -
14) Load Transient Response
R1223N332A
VIN=5V
L=27uH
VIN=5V
L=27uH
R1223N332A
3.6
3.5
3.4
3.3
3.2
3.1
3
3.4
3.3
3.2
3.1
3
500
500
0.1
2.9
2.8
2.7
2.6
2.5
2.4
2.9
2.8
2.7
2.6
0.
0
0.05
0.1
0
0
0
0.0002 0.0004 0.0006 0.0008 0.001
Time (sec)
Time (sec)
VIN=5V
L=27uH
VIN=5V
L=27uH
R1223N332B
R1223N332B
3.6
3.5
3.4
3.3
3.2
3.1
3
3.4
3.3
3.2
3.1
3
50
50
2.9
2.8
2.7
2.6
2.5
2.4
2.9
2.8
2.7
2.6
0.
0.
0.1
0
0.05
Time (sec)
0.0002 0.0004 0.0006 0.0008 0.001
Time (sec)
VIN=5V
L=27uH
VIN=5V
L=27uH
R1223N332C
R1223N332C
3.6
3.5
3.4
3.3
3.2
3.1
3
3.4
3.3
3.2
3.1
3
500
0.1
2.9
2.8
2.7
2.6
2.5
2.4
500
2.9
2.8
2.7
2.6
0.1
0.0002 0.0004 0.0006 0.0008 0.001
Time (sec)
0
0.05
0.1
Time (sec)
12345
Rev. 1.11
- 17 -
VIN=5V
L=27uH
VIN=5V
L=27uH
R1223N332D
R1223N332D
3.4
3.3
3.2
3.1
3
3.6
3.5
3.4
3.3
3.2
3.1
3
500
0.1
500
0.1
2.9
2.8
2.7
2.6
2.5
2.4
2.9
2.8
2.7
2.6
0
0.0002 0.0004 0.0006 0.0008 0.001
Time (sec)
0
0.05
0.1
Time (sec)
15) Turn-on Waveform
R1223N332A
(VIN=10V,IOUT=0mA)
R1223N332A(VIN=5V,IOUT=0mA)
L=27uH
L=27uH
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
10
0
-1.5
-2
-2.5
-3
0
-3.5
-0.01
0
0.01
Time (sec)
0.02
-0.01
0
0.01
0.02
Time (sec)
(VIN=10V,IOUT=0mA)
(VIN=5V,IOUT=0mA)
R1223N332B
R1223N332B
L=27uH
L=27uH
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
1
5
0
0
-0.01
0
0.01
0.02
-0.01
0
0.01
Time (sec)
0.02
Time (sec)
12345
Rev. 1.11
- 18 -
(VIN=10V,IOUT=100mA)
(VIN=5V,IOUT=100mA)
R1223N332A
R1223N332A
L=27uH
L=27uH
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
5
-0.5
-1
-0.5
-1
10
0
-1.5
-2
-1.5
-2
-2.5
-3
-2.5
-3
0
-3.5
-3.5
-0.01
0
0.01
0.02
-0.01
0
0.01
Time (sec)
0.02
Time (sec)
(VIN=10V,IOUT=100mA)
(VIN=5V,IOUT=100mA)
R1223N332B
R1223N332B
L=27uH
L=27uH
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
10
0
5
0
-0.01
0
0.01
0.02
-0.01
0
0.01
Time (sec)
0.02
Time (sec)
12345
Rev. 1.11
- 19 -
相关型号：
R1223N502H-TL
Switching Controller, Voltage-mode, 0.01A, 600kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN
RICOH
R1223N512ATR
Switching Regulator/Controller, Voltage-mode, 0.01A, 300kHz Switching Freq-Max, CMOS, PDSO5,
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