NJU7677RB1 NJRC [New Japan Radio], NJU7677RB1 Datasheet

no-image

NJU7677RB1

Manufacturer Part Number
NJU7677RB1
Description
1.8V Operate PWM control Step-Up / Flyback switching regulator IC
Manufacturer
NJRC [New Japan Radio]
Datasheet
■GENERAL DESCRIPTION
■FEATURES
■PIN CONFIGURATION
Ver.2009-09-08
regulator control IC. It features a totem pole driver that can directly
drive an external MOS-FET.
function are included, requiring no external components. All
parameters can be optimized by additional external components for
design flexibility.
● Package Outline
● PWM switching control
● Operating Voltage
● Wide Oscillator Range
● Maximum Duty Cycle
● Quiescent Current
● Soft-Start Function
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
NJU7677 is a high speed low voltage operation switching
Internal soft-start function, dead time control and timer latch
1
2
3
4
NJU7677RB1
1.8V Operate PWM control Step-Up / Flyback switching regulator IC
90% typ.
600µA typ.
Internal : 4ms typ. or adjustable
NJU7677RB1 : TVSP8
1.8V to 7V
300kHz to 1MHz
8
7
6
5
PIN FUNCTION
1. V
2. FB
3. IN-
4. SCP
5. DTC
6. RT
7. GND
8. OUT
+
■PACKAGE OUTLINE
NJU7677RB1
NJU7677
- 1 -

Related parts for NJU7677RB1

NJU7677RB1 Summary of contents

Page 1

... Quiescent Current 600µA typ. ● Soft-Start Function Internal : 4ms typ. or adjustable ● Dead Time Control ● Timer Latch for Short Circuit Protection ● C-MOS Technology ● Package Outline NJU7677RB1 : TVSP8 ■PIN CONFIGURATION NJU7677RB1 Ver.2009-09-08 PIN FUNCTION ...

Page 2

NJU7677 ■BLOCK DIAGRAM FB IN- 1V Vref Soft Start SCP ⋅ AMP UVLO Latch 2 µ A SCP OSC 2kΩ 0 DTC RT 0.65V 0.15V PWM Buffer 0.6V 0.5V ...

Page 3

MAXIMUM RATINGS (Ta=25°C) PARAMETER Supply Voltage Output Pin Current Power Dissipation Operating Temperature Range Storage Temperature Range ■RECOMMENDED OPERATING CONDITIONS (Ta=25°C) PARAMETER Operating Voltage Oscillator Timing Resistor Oscillation Frequency ■ELECTRICAL CHARACTERISTICS (V PARAMETER Under Voltage Lockout Block ON Threshold ...

Page 4

NJU7677 ■ELECTRICAL CHARACTERISTICS (V PARAMETER Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current PWM Comparate Block Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON ...

Page 5

TYPICAL APPLICATIONS Step-Up Converter + SCP Flyback Converter + V NJU7677 SCP Ver.2009-09- NJU7677 FET ...

Page 6

NJU7677 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance + (V =3.3V, Ta=25 1000 100 10 Timing Resistance R Oscillation Frequency vs. Operating Voltage (R =47kΩ, Ta=25 T 740 720 700 680 660 0 2 Operating Voltage V Reference Voltage vs. ...

Page 7

CHARACTERISTICS Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA -50 - Ambient Temperature Ta ( Ver.2009-09-08 Error Amplifier Block Voltage Gain, Phase vs. Frequency + (V =3.3V, Gain=40dB, Ta=25 60 ...

Page 8

NJU7677 ■TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature + (V =3.3V -50 - Ambient Temperature Ta ( Oscillator Frequency vs. Temperature + (V =3.3V, R 760 740 720 700 680 660 ...

Page 9

MEMO Ver.2009-09-08 NJU7677 [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product ...

Related keywords