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PDF NJW4161 Data sheet ( Hoja de datos )
| Número de pieza | NJW4161 | |
| Descripción | MOSFET Drive Switching Regulator IC | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJW4161
MOSFET Drive Switching Regulator IC for Buck Converter
GENERAL DESCRIPTION
The NJW4161 is a MOSFET Drive switching regulator IC for
Buck Converter that operates wide input range from 3.1V to 40V.
It can provide large current application because of built-in highly
effective Pch MOSFET 10V drive circuit.
There are two types, Hiccup type and Latch type, of over
current protection version.
It is suitable for logic voltage generation from high voltage that
Car Accessory, Office Automation Equipment, Industrial
Instrument and so on.
■ PACKAGE OUTLINE
NJW4161R
(MSOP8(VSP8))
NJW4161D
(DIP8)
FEATURES
Pch MOSFET Driving
Driving Voltage V+-10V(typ.)
Wide Operating Voltage Range 3.1V to 40V
PWM Control
Automatic PWM/PFM Control improves power efficiency at light load. (C ver.)
Wide Oscillating Frequency
50kHz to 1MHz
Soft Start Function
15ms (typ.)
Over Current Protection
Hiccup type (A, C ver.)
Latch type (B ver.)
Thermal Shutdown Protection
UVLO (Under Voltage Lockout)
Standby Function
Package Outline
NJW4161R: MSOP8(VSP8) *MEETJEDEC MO-187-DA
NJW4161D: DIP8
PRODUCT CLASSFICATION
Part Number
Version
NJW4161R-A
NJW4161D-A
NJW4161R-B
NJW4161R-C
A
A
B
C
Controller
PWM control
PWM control
PWM control
PWM/PFM
control
Over Current
Protection
Hiccup type
Hiccup type
Latch type
Hiccup type
Package
MSOP8
(VSP8)
DIP8
MSOP8
(VSP8)
MSOP8
(VSP8)
Operating
Temperature
Range
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
Ver.2015-05-11
-1-
1 page  
NJW4161
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
(Unless otherwise noted, V+=12V, RT=10k , CREGH=0.1 F, Ta=25 C)
TEST CONDITION
MIN. TYP. MAX. UNIT
RT pin Enable Control Block
RT pin Current at Standby
General Characteristics
Quiescent Current
Standby Current
IRT_STB
IDD
IDD_STB
RL=no load,
VIN-=0.7V, VFB=0.7V
VRT=OPEN
5.0 – – A
– 1.5 3 mA
– 2 10 A
TYPICAL APPLICATIONS
Non-isolated Buck Converter
VIN
RSENSE
CIN1
CIN2
Q1
CREGH
4321
V+ OUT SI REGH
NJW4161
IN- FB RT GND
5678
L
SBD
RNF
CNF
RT
Q2
Enable Control
COUT
CFB
RFB
VOUT
R2
R1
Ver.2015-05-11
-5-
5 Page 
NJW4161 ApplicationNJMWan4u16a1l
Technical Information
Description of Block Features (Continued)
Driver Section , 10V Regulator Section (Driver, 10V Regulator)
The output driver circuit is configured a totem pole type, it can efficiently drive a Pch MOSFET switching device.
When the output is low level, the OUT pin voltage is clamped with V+ -10V (typ.) by the internal regulator to protect
gate of Pch MOSFET. (Ref. Fig.2. OUT pin)
V+
10V
Regulator
500kW
V+
CREGH
CIN2
VIN
From PWM
Comparator
Driver
OUT
VGS
RG
REGH
V+ To turn off Pch MOSFET
High Level Output
V+-10V
GND
OFF ON
OFF ON
To turn on Pch MOSFET
Low Level Output
Fig. 2. Driver Circuit and the OUT pin Voltage
When supply voltage is decreasing, gate drive voltage output from the OUT pin is also decreasing. Fig.3. shows
the example of the “OUT pin Differential Voltage vs. supply voltage” characteristic
The optimum drive ability of MOSFET depends on the oscillating frequency and the gate capacitance of MOSFET.
OUT pin Differential Voltage vs. Supply Voltage
12 (IO=0mA, Ta=25ºC)
10
8
6
4
2
0
0 2 4 6 8 10 12 14
Supply Voltage V+ (V)
Fig. 3. OUT pin Differential Voltage vs. Supply Voltage Characteristic
Ver.2015-05-11
- 11 -
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NJW4161.PDF ] | |
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