njw4800 New Japan Radio Co.,Ltd, njw4800 Datasheet
njw4800
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njw4800 Summary of contents
Page 1
... GENERAL DESCRIPTION The NJW4800 is a general purpose, half bridge power driver capable of supplying 4A current. The internal gate driver drives high-side/low-side power MOSFET; therefore, it has fast switching. Additionally, it has protection features such as over current protection and thermal shutdown. And in the case of failure, it can output a fault flag. ...
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... NJW4800 BLOCK DIAGRAM Over current Protection Thermal Shut Down Under Voltage Lock Out PWM Input Control STBY 750k Ω FLT REG FLT REG Regulator (5V) High Side Level Shift Gate Driver Low Side Gate Driver GND VDD OUT 100k Ω ...
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... Internal foil area: 74.2 × 74.2mm) Power Dissipation vs. Ambient Temperature o (Topr=-40~+85 C, Tj= ~150 4 3 layer PC Board 3 2 layer PC Board 1 0.5 0 -50 - Ambient Temperature Ta ( NJW4800 (Ta=25°C) UNIT REMARKS V VDD-GND pin STBY, V PWM-GND pin V FLT-GND pin V BS-GND pin V BS-OUT pin W – °C – °C – ...
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... NJW4800 ELECTRICAL CHARACTERISTICS PARAMETER General Characteristics Quiescent Current 1 (Operating) Quiescent Current 2 (Switching) Quiescent Current 3 (Standby) Output Block High-side SW ON Resistance Low-side SW ON Resistance Over Current Limit Output Rise Time Output Fall Time Dead Time PWM Rise Delay Time PWM Fall Delay Time OUT pin – ...
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... ON RUVLO – OFF – OFF + < V OFF DUVLO + < V OFF DUVLO or more and is input, it becomes low-side SW=ON during t OUTPUT High-side FLT SW OFF OFF OFF OFF NJW4800 + =12V, V =0V, C =0.1µF, C STBY BS REG MIN. TYP. 4.75 5 – 2 – – – 0.25 – – OUTPUT High-side ...
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... NJW4800 TIMING CHART Fig1. Output Rise/Fall Time, PWM Rise/Fall Delay Time PWM OUT Fig2. Maximum Continuous Output Time (High-level) PWM OUT Fig3. Switching and Dead Time - 6 - 50% tr 90% 50% 10% t d_ON t HPWM ON High Side SW OFF ON Low Side SW OFF Dead Time 50ns typ. ...
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... GND NJW4800 C =100µ =0.1µ OUT C =100µ =0.1µ =1µF P VDD REG BS FLT NJW4800 FAULT PWM PWM OUT Signal PWM Signal STBY GND Stand- =1µF P VDD REG BS FLT NJW4800 FAULT PWM OUT PWM Signal STBY ...
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... NJW4800 CHARACTERISTICS Over Current Limit vs. Temperature (High-side =0.47µF BS 6.5 C =1µF REG 6 5.5 5 4.5 4 -50 - Ambient Temperature Ta ( High-side SW ON Resistance vs. Temperature (I =1A, V OSOURCE 0.5 0.4 0.3 0.2 0.1 0 -50 - Ambient Temperature =12V) 6.5 5.5 4.5 75 100 125 150 o C) Low-side SW ON Resistance vs. Temperature =5V) BS-OUT 75 100 125 150 ...
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... V ILPWM 1.2 1 -50 - Ambient Temperature Ta ( Ver.2010-09-29 =3V) PWM 75 100 125 150 100 125 150 100 125 150 o C) NJW4800 Internal Power Supply Circuit Load Regulation =12V, Ta=25 C) 5.1 =1 µ REG 5 4.9 4.8 4 Output Current I REG STBY pin Voltage vs. Temperature ...
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... NJW4800 CHARACTERISTICS Quiescent Current 1 vs. Operating Voltage (V =0V, Ta=25 PWM 2 =0.47 µ µ REG 1 Operating Voltage V Quiescent Current 2 vs. Operating Voltage (V =0V to 3V, f PWM PWM 20 C =0.47µ =1µF REG Operating Voltage V Quiescent Current 3 vs. Operating Voltage ...
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... Boot Strap Output drives the High-side Switch. You should connect capacitor larger than 0.1µF between BS Terminal (5-pin) and Out Terminal (3-pin). Standby Terminal NJW4800 becomes standby status by High Level NJW4800 operates by Low Level Built-in Regulator (5V) Output Terminal You should connect capacitor larger than 1µF for stable output. ...
Page 12
... Fig4) If OUT terminal is shorted directly to GND, a large surge current is flowing for fast current change and may exceed current limit. Because that time big electric power consumption occurs instantaneously in NJW4800, you should design sufficient heat dissipation. When a load condition is inductive property, a reverse direction current flows to the high-side and low-side SW body diode by inductive kickback ...
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... It has drooping characteristic at over current protection function. Thermal Shut Down Function When NJW4800 chip temperature exceeds the 170°C, internal thermal shutdown circuit operates and SW function is stopped. The Fault signal is output simultaneously from the FLT terminal. In order to return SW operation, you should make chip surface temperature (Junction Temperature: Tj) below the 150° ...
Page 14
... Because of this 30mA it is flowing via the OUT terminal from the regulator circuit. Standby Function NJW4800 stops the operating and becomes standby status when 2.4V or more is supplied to STBY terminal. You should connect the terminal with GND level to prevent the malfunction by a noise when you do not use this function. ...
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... APPLICATION TIPS In the application that does a high-speed switching of NJW4800, because the current flow corresponds to the input frequency, the substrate (PCB) layout becomes an important. NJW4800 is driving the High-side/Low-side SW gate with high speed to reduce switching losses. The transient voltage is generated by parasitic inductance and a high-speed current change of high side and low side SW. ...
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... NJW4800 MEMO - 16 - [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 and not intended for the guarantee or permission of any right including the industrial rights ...