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PDF ( 数据手册 , 数据表 ) NR131S

零件编号 NR131S
描述 Buck Regulator IC
制造商 SANKEN
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NR131S 数据手册, 描述, 功能
Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131S
Jul./09/2015
General Descriptions
The NR131S is buck regulator ICs integrates High-side
power MOSFETs. With the current mode control, ultra
low ESR capacitors such as ceramic capacitors can be
used. The ICs can realize super-high efficiency by
performing pulse skip operation at light load condition.
The ICs have protection functions such as Over-Current
Protection (OCP), Under-Voltage Lockout (UVLO) and
Thermal Shutdown (TSD). Soft starting time can be set
up by selecting an external capacitor value. The ON/OFF
pin (EN Pin) turns the regulator on or off and helps to
achieve low power consumption requirements. The
NR131S is available in an 8-pin SOIC package.
Package
SOIC8
Features & Benefits
Current mode PWM control
Up to 94% efficiency at normal load condition
Up to 85% efficiency at light load condition
Stable with low ESR ceramic output capacitors
Built-in protection function
Over Current Protection (OCP)
Thermal Shutdown (TSD)
Under Voltage Lockout (UVLO)
Built-in phase compensation
Adjustable Soft-Start with an external capacitor
Turn ON/OFF the regulator function
Programable Pulse-Skip operation
Electrical Characteristics
3A Continuous output current
Operating input range VIN = 4.5V17V
Output adjustable VO = 0.8V14V
Fixed 350kHz frequency
Applications
LCD TV / Blue-ray / Set top box
Green electronic products
Other power supply
Typical Application Circuit
NR131S
C1, C2: 10μF / 25V, C4, C5: 22μF / 16V, C7: 0.1μF, C9:1800pF, C11: 220pF(Option), R1: 510kΩ , R3: 10Ω, R4: 36 kΩ, R5: 27kΩ
(VO=5.0V), R6: 12kΩ, R7:510kΩ(Option), D1: SJPJ-L4, L1: 10μH
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
1







NR131S pdf, 数据表
Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR131S
Jul./09/2015
Example Application Circuit
NR131S
C1, C2: 10μF / 25V, C4, C5: 22μF / 16V, C7: 0.1μF, C9:1800pF, C11: 220pF(Option), R1: 510kΩ , R3: 10Ω, R4: 36 kΩ, R5: 27kΩ
(VO=5.0V), R6: 12kΩ, R7:510kΩ(Option), D1: SJPJ-L4, L1: 10μH
A design guide for add-on parts around of the NR131S.
(1)Diode D1
The schottky-barrier diode must be used for D1. If other diodes like fast recovery diodes are used, IC may be
damaged because of the reverse voltage applied by the recovery voltage or ON voltage.
(2)Choke coil L1
If the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the rating.
As the start current of the over current protection is approximately 4A, attention must be paid to the heating of the choke
coil by the magnetic saturation due to overload or short-circulated load.
(3)Capacitor C1( C2), C4(C5), C9
As large ripple current across C1 (C2) and C4 (C5), capacitors with high frequency and low impedance for SMPS must be
used. Especially when the impedance of C4 (C5) is high, the switching waveform may not be normal at low temperature.
C9 is a capacitor for soft start. In case soft start function is not used, please keep Pin No.2 open.
(4)Resistor R1, R2
R4, R5, R6 are resistor to the Output Voltage. In case of the I(ADJ) = 66μA, R4, R5, R6 are calculated by the next
equation .
Ω
μ
Ω
*63kΩ= 27kΩ+36kΩ
Ω
In order to have optimum operating condition, each component must be connected with the minimum distance.
Rev.2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
8














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