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NR110E Schematic ( PDF Datasheet ) - SANKEN

Teilenummer NR110E
Beschreibung Light Load High Efficiency Buck Regulator
Hersteller SANKEN
Logo SANKEN Logo 




Gesamt 13 Seiten
NR110E Datasheet, Funktion
Light Load High Efficiency, 31V, Buck Regulator
NR110E series
General Descriptions
The NR110E series is buck regulator ICs integrates
High-side power MOSFET. The feature increasing
efficiency at light loads allows the device to be used in
the energy-saving applications. With the current mode
control, ultra low ESR capacitors such as ceramic
capacitors can be used. The ICs have protection functions
such as Over-Current Protection (OCP), Under-Voltage
Lockout (UVLO) and Thermal Shutdown (TSD). An
adjustable Soft-Start by an external capacitor prevents the
excessive inrush current at turn-on. The ICs integrate
phase compensation circuit which reduces the number of
external components and simplifies the design of
customer application. The ON/OFF pin (EN Pin) turns
the regulator on or off and helps to achieve low power
consumption requirements. The NR110E series is
available in an 8-pin SOIC package with an exposed
thermal pad on the back side.
Package
Exposed SOIC 8
Thermally enhanced 8-Pin package
Oct/23/2012
Features & Benefits
Current mode PWM control
Up to 94% Efficiency,
Up to 68% Efficiency at IO = 20mA Light Load
Adjustable “Over Current ProtectionOCP
Current mode PWM control
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/OF the regulator function
Electrical Characteristics
Operating input range VIN = 6.5V31V
Output adjustable VO= 0.8V24V
2A / 4A output current
Fixed 350kHz frequency
Applications
LCD TV / Blu-Ray / Set top box
Home appliance
Green Electronic products
Other power supply
Typical Application Circuit
VIN
VIN_s
R1
C2 C1
GND
C9
R3
2
IN
7
EN
C10
1
BS 3
SW
NR111E
8
SS
GND
4
5
FB
ISET
6
L1
R5
R4
R7 R6
D1
Vo
Vo_s
C4 C5
GND
C1, C2: 10μF / 35V
C4, C5: 22μF / 16V
C9: 0.1μF
C10: 0.1μF
SW
R1: 1.7MΩ
L1: 10μH
R3: 22Ω
R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V)
R6: 3.9kΩ
Rev.1.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
1
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NR110E Datasheet, Funktion
Light Load High Efficiency, 31V, Buck Regulator
NR110E series
Oct/23/2012
Functional Block Diagram
2 IN
VIN
C1 C2
R1
7
EN
6
ISET
ON/
OFF
ISET
OSC
P.REG
Σ
Current
Sense
Amp
OCP
OCP_REF
Drive
REG
VREF
0.8V
OCP_REF
PWM
LOGIC
FB OVP
UVLO
Compensation
Err Amp
0.8V
FB
GND 4
TSD
SS
SS 8
C9
D2
Option)
1
BS
R3
3
SW
C10
L1
R5
D1
C4
5
FB
R4
R6
VO
C5
Pin Assignments & Functions
Pin Functions
Pin No. Symbol
1 BS
2 IN
3 SW
4 GND
5 FB
6 ISET
7 EN
8 SS
Pin Assignments
Description
High-side Boost input.
BS supplies the drive for High-side Nch-MOSFET switch.
Connect a capacitor and a resistor between SW to BS.
Power input. IN supplies the power to the IC as well as the regulator switches
Power switching output.
SW supplies power to the output.
Connect the LC filter from SW to the output.
Note that a capacitor is required from SW to BS to supply the power the High-side
switch
Ground
Connect the exposed pad to Pin No.4
Feedback input Pin to compare Reference Voltage. The feedback threshold is 0.8V.
To set the output voltage, FB Pin is required to connect between resistive voltage
divider R4 and R6.
Adjust Pin of OCP starting current
OCP starting current can be adjusted by connecting a resistor to ISET Pin.
In the case of using at Maximum Io, ISET Pin is required to connect to GND.
Enable input.
Drive EN Pin high to turn on the regulator, low to turn it off.
Soft-Start control input.
To set the soft-start period, connect to a capacitor between GND.
Rev.1.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
6

6 Page









NR110E pdf, datenblatt
Light Load High Efficiency, 31V, Buck Regulator
NR110E series
Oct/23/2012
OPERATING PRECAUTIONS
Reliability can be affected adversely by improper storage environments and handling methods. Please observe the
following cautions.
Heat dissipation and reliability
Thermal performance of the surface mount package IC depends on the material and area size of PCB and its copper
plane. Design thermal condition with sufficient margin
Parallel operation
The parallel operation to increase the current is not available.
Thermal shut down
The NR111E has a thermal protection circuit.
This circuit protects the IC from the heat generation by the over load.
This circuit cannot guarantee the long-term reliability against the continuously over load status.
Cautions for Storage
Ensure that storage conditions comply with the standard temperature (5 to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity.
Avoid locations where dust or harmful gases are present and avoid direct sunlight.
Reinspect for rust on leads and solderability of products that have been stored for a long time.
Cautions for Testing and Handling
When tests are carried out during inspection testing and other standard test periods, protect the products from power
surges from the testing products, shorts between the product pins, and wrong connections. In addition, avoid tests
exceeded ratings
Soldering
When soldering the products, please be sure to minimize the working time, within the following limits.
Reflow Preheat ; 180°C / 90±30s
Heat ; 250°C / 10±1s (260°C peak ,2times)
Soldering iron ; 380±10°C / 3.5±0.5s (1time)
Electrostatic Discharge
When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1MΩ of
resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator.
Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats.
When using measuring equipment such as a curve tracer, the equipment should be grounded.
When soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak
voltages generated by them from being applied to the products.
The products should always be stored and transported in Sanken shipping containers or conductive containers, or be
wrapped in aluminum foil.
Rev.1.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
12

12 Page





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