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R1224N422F-TR-F PDF预览

R1224N422F-TR-F

更新时间： 2024-09-25 10:31:27
品牌 Logo 应用领域
理光 - RICOH 开关控制器开关式稳压器开关式控制器光电二极管电源电路开关式稳压器或控制器
页数 文件大小 规格书
2页 175K
描述
Switching Controller, 500kHz Switching Freq-Max, CMOS, PDSO5, ROHS COMPLIANT, SOT-23, 5 PIN

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R1224N422F-TR-F 数据手册

 浏览型号R1224N422F-TR-F的Datasheet PDF文件第2页 
R1224N Series  
PWM/VFM Step-down DC/DC Controller with Ext. Tr.  
The R1224N Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor.  
By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC  
converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output  
current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and  
adjustable output voltage with an external resistor is also available. The reset type protection circuit embedded into the device limits  
output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined  
period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224N also includes an  
under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the  
UVLO detect voltage and reduces supply current.  
FEATURES  
• Supply Current (IDD1)·················· Typ. 20  
μ
A (E, F, L, M Versions), Typ. 30  
μ
A (G Version),  
• Output Voltage Accuracy················ ± 2%  
Typ. 40  
μA (H Version) (VIN=VOUT=18.5V)  
• Oscillator Frequency (fosc) ·············· 180kHz, 300kHz, 500kHz  
• Standby Current (Istandby) ············ Max. 0.5μA (In standby)  
•
··· Min. 100%  
• Input Voltage Range (VIN)·········· 2.3V to 18.5V  
• OUsVciLllaOtorDMeatxeimctumVoDltuatygCeyc(VleU(MVLaOx)d·u··ty··)···· Typ. 2.0V  
• Output Voltage Range (VOUT)····· 1.2V to 6.0V (internally fixed R1224Nxx2E/F/L)  
• Soft Start Time (tstart)······················· Typ. 10ms  
Externally adjustable (Feedback voltage of 1.0V, R1224Nxx2G/H/M) • Reset Protection Circuit ················· Delay time for protection  
Typ. 15ms  
• Package ········································· SOT-23-5  
BLOCK DIAGRAMS  
R1224Nxx2E/F/L  
R1224Nxx2G/H/M  
(Internally fixed output voltage type)  
(Externally adjustable output voltage type)  
OSC  
OSC  
VIN  
VIN  
5
5
V
OUT  
VFB  
3
3
-
-
-
-
EXT  
4
EXT  
4
Amp  
Amp  
+
+
Vref  
Vref  
+
+
PWM/VFM  
CONTROL  
Soft Start  
Soft Start  
1
1
Chip Enable  
CE  
Chip Enable  
CE  
Protection  
UVLO  
Protection  
+
-
+
-
Vref  
Vref  
UVLO  
2
2
GND  
GND  
SELECTION GUIDE  
TYPICAL APPLICATIONS  
R1224Nxx2E/F/L  
R1224Nxx2G/H/M  
Package Quantity per Reel  
SOT-23-5 3,000 pcs  
Part No.  
L
L
R1224N  
.
xx.  
2.  
∗-TR-F  
PMOS  
PMOS  
+
-
C1  
R4  
C4  
R3  
4
4
IN EXT  
.
xx.  
:
Specify the output voltage within the range  
C1  
5
1
3
IN EXT VOUT  
5
1
3
V
VFB  
V
1.2V (  
.
12  
.
) to 6.0V (  
.60  
.
) in 0.1V steps.  
C3  
C3  
R1  
R1  
+
-
+
-
SD  
SD  
CE GND  
2
CE GND  
2
(For externally adjustable output voltage type, feedback voltage of 1.0V(  
.
10  
.
))  
R2  
.
.
:
Specify the oscillator frequency, modulation method, output  
voltage adjustment.  
∗
C2  
C2  
.
.
.
.
.
.
E
.
: 300kHz, PWM/VFM, fixed output voltage  
: 500kHz, PWM/VFM, fixed output voltage  
: 300kHz, fixed PWM, adjustable output voltage  
: 500kHz, fixed PWM, adjustable output voltage  
: 180kHz, PWM/VFM, fixed output voltage  
CE CONTROL  
CE CONTROL  
F
.
PMOS : HAT1044M, L : 27μH,  
SD : RB063L-30, C1 : 10μF, C2 : 0.1μF,  
C3 : 47μF, R1 : 10Ω  
PMOS : HAT1044M, L : 27μH,  
SD : RB063L-30, C1 : 10μF, C2 : 0.1μF,  
C3 : 47 F, C4 : 1000pF, R1 : 10 , R3 : 2.7k  
Output voltage at 2.5V⋅⋅⋅R2 : 22kΩ, R4 : 33kΩ  
G
H
.
.
μ
Ω
Ω,  
L
.
M
.
:180kHz, fixed PWM, adjustable output voltage  
PACKAGE (Top View)  
TYPICAL CHARACTERISTIC  
R1224N332E Efficiency vs. Output Current  
SOT-23-5  
5
4
VIN=7V, L=CDRH127(10μH)  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
2
3
1
2
3
4
5
CE  
GND  
VOUT or VFB  
EXT  
0.1  
1
10  
100  
1000 10000  
VIN  
Output Current IOUT (mA)  
APPLICATIONS  
• Power source for hand-held communication equipment, cameras, and VCRs  
• Power source for home appliances  
• Power source for battery-powered equipment  
No.EK-101-091101  
Step-down DC/DC Converter  
12

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