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参数资料
| 型号： | R1242S001F-E2-FE |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 550 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | HALOGEN FREE AND ROHS COMPLIANT, HSOP-8 |
| 文件页数： | 1/2页 |
| 文件大小： | 192K |
| 代理商： | R1242S001F-E2-FE |
R1242S Series
3A
30V Input PWM Step-down DC/DC Converter with Synch. Rectifier Ext. Low-side Tr.
No.EK-191-101001
Step-down DC/DC Converter
The R1242S Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 3A
output current. R1242S includes a
soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a low side switch (FET), and
capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode
PWM control, the R1242S provides a fast response and high efficiency. Ceramic output capacitors can be used.
FEATURES
Supply Current (I
DD
) Typ. 0.8mA (VIN=30V, SET VFB=1.0V)
Standby Current (I
standby
) Max. 20
μA (VIN=30V, CE="L")
Input Voltage Range (V
IN
) 5.0V to 30.0V
Output Voltage Range (V
OUT
) 0.8V to 15.0V (externally adjustable)
(Feedback voltage : 0.8V)
Feedback Voltage Accuracy ± 12mV
Output Current (I
OUT
) 3A
Oscillator Frequency (f
osc
) Select from 330kHz to 1MHz with an external
resistor (A/B Version),
330kHz (C/D), 500kHz (E/F), or 1MHz (G/H)
Oscillator Maximum Duty Cycle (Maxduty) Typ. 88%
UVLO Detect Voltage (V
UVLO
) Typ. 3.6V
Soft Start Time (t
start
) Typ. 0.5ms
High Side Switch Limit CurrentTyp. 4.5A
Thermal Shutdown Circuit Stops at 160°C
Latch Protection CircuitDelay time for protection
Typ. 5ms (A/C/E/G Version)
Fold-back Protection CircuitFold-back frequency
fosc
× 1/4 (B Version),
83kHz (D Version),
125kHz (F Version),
250kHz (H Version)
PackageHSOP-8E
) This is an approximate value, because output current depending on conditions and external parts.
BLOCK DIAGRAM
TYPICAL APPLICATION
R1242S001A/B
Efficiency vs. Output Current
VIN
VFB
RT
CE
LX
BST
COUT
10
μF
"H"active
CBST
0.1
μF
VOUT=3.3V
VIN
CIN
10
μF
R1
50k
Ω
CSPD
100pF
R2
16k
Ω
L4.7
μH
GND
at short 1000kHz
GND
5.1k
Ω
(Recommendation)
EXT
R1242S001A
Thermal Shutdown
LX
BST
CE
VIN
EXT
UVLO
Regulator
Soft Start
Current Slope
Peak Current Limit
Vref
Limit Latch
D
S
R
Regulator
0.8V
MAXDUTY
SETPULSE
Shutdown
OSC
5V
GND
Shutdown
55mV
RT
VFB
CSPD: Speed-up capacitor
CIN, COUT: Ceramic capacitors can be used.
CBST: Bootstrap Capacitor
R1, R2: Resistors for setting output voltage
SELECTION GUIDE
Halogen Free
Package
Q'ty per Reel
Part No.
HSOP-8E
1,000 pcs
R1242S001.
-E2-FE
. : Specify a combination of the oscillator frequency and the protection circuit.
.A. : Oscillator Frequency adjustable, Latch type
.B. : Oscillator Frequency adjustable, Fold-back type
.C. : 330kHz, Latch type
.D. : 330kHz, Fold-back type
.E. : 500kHz, Latch type
.F.. : 500kHz, Fold-back type
.G. : 1MHz, Latch type
.H. : 1MHz, Fold-back type
PACKAGE
TYPICAL CHARACTERISTIC
HSOP-8E
Top View
Bottom View
5
8
6
4
2
1
3
8
6
5
7
1
3
4
2
7
) The tab is substrate level (GND).
2) The TEST pin connected to the GND level or
should be open.
1
CE
2
EXT
3
BST
4
VIN
5
Lx
6
GND
7
VFB
8
RT or TEST
2
R1242S
Efficiency vs. Output Current
APPLICATIONS
Power source for digital home appliances such as digital TVs and DVD players
Power source for hand-held communication equipment, cameras, and VCRs
Power source for office automation equipment such as printers and fax machines
Power source for battery-powered equipment
0
20
40
100
60
80
10
0
100
1000
VIN=5V
10000
VOUT=3.3V, fosc=500kHz
(Synchronous rectification)
Output Current IOUT (mA)
Ef
ficiency
η
(%)
VIN=9V
VIN=12V
VIN=24V
VIN=30V
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