ncp3030a ON Semiconductor, ncp3030a Datasheet

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ncp3030a

Manufacturer Part Number
ncp3030a
Description
Ncp3030a, Ncp3030b Synchronous Pwm Controller
Manufacturer
ON Semiconductor
Datasheet

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Part Number:
ncp3030aDR2G
Manufacturer:
ON Semiconductor
Quantity:
3 450
NCP3030A, NCP3030B
Synchronous PWM Controller
input range and is capable of producing an output voltage as low as
0.6 V. The NCP3030 provides integrated gate drivers and an internally
set 1.2 MHz (NCP3030A) or 2.4 MHz (NCP3030B) oscillator. The
NCP3030 also has an externally compensated transconductance error
amplifier with an internally fixed soft−start. Protection features
include lossless current limit and short circuit protection, output
overvoltage protection, output undervoltage protection, and input
undervoltage lockout. The NCP3030 is currently available in a
SOIC−8 package.
Features
© Semiconductor Components Industries, LLC, 2010
December, 2010 − Rev. 0
The NCP3030 is a PWM device designed to operate from a wide
V
C
Input Voltage Range from 4.7 V to 28 V
1.2 MHz Operation (NCP3030B – 2.4 MHz)
0.8 V Internal Reference Voltage
Internally Programmed 1.8 ms Soft−Start (NCP3030B – 1.3 ms)
Current Limit and Short Circuit Protection
Transconductance Amplifier with External Compensation
Input Undervoltage Lockout
Output Overvoltage and Undervoltage Detection
These are Pb−Free Devices
R
IN
C2
C
Figure 1. Typical Application Circuit
C
IN
C
C1
COMP
FB
VCC BST
GND
HSDR
LSDR
VSW
C
BST
R
ISET
Q1
Q2
L
0
1
R
R
FB1
FB2
Vout
C
0
†For information on tape and reel specifications,
NCP3030ADR2G
NCP3030BDR2G
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Device
ORDERING INFORMATION
3030x = Specific Device Code
A
L
Y
W
G
COMP
PIN CONNECTIONS
GND
V
MARKING DIAGRAM
http://onsemi.com
CC
FB
x = A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
8
1
(Pb−Free)
(Pb−Free)
SOIC−8 NB
Package
8
CASE 751
SOIC−8
SOIC−8
3030x
ALYW
Publication Order Number:
G
1
2500 / Tape & Reel
2500 / Tape & Reel
BST
VSW
LSDR
HSDR
Shipping
NCP3030/D

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ncp3030a Summary of contents

Page 1

... The NCP3030 is a PWM device designed to operate from a wide input range and is capable of producing an output voltage as low as 0.6 V. The NCP3030 provides integrated gate drivers and an internally set 1.2 MHz (NCP3030A) or 2.4 MHz (NCP3030B) oscillator. The NCP3030 also has an externally compensated transconductance error amplifier with an internally fixed soft−start. Protection features ...

Page 2

VCC OSCILLATOR COMP REF FB PIN FUNCTION DESCRIPTION Pin Pin Name 1 V The V pin is the main voltage supply input also used in conjunction with the VSW pin to sense current the high ...

Page 3

ABSOLUTE MAXIMUM RATINGS (measured vs. GND pin 8, unless otherwise noted) Rating High Side Drive Boost Pin Boost to V differential voltage SW COMP Feedback High−Side Driver Output Low−Side Driver Output Main Supply Voltage Input Switch Node Voltage Maximum Average ...

Page 4

... T Ramp−Amplitude Voltage Ramp Valley Voltage PWM Minimum Duty Cycle Maximum Duty Cycle NCP3030A NCP3030B Soft Start Ramp Time NCP3030A NCP3030B ERROR AMPLIFIER (GM) Transconductance Open Loop dc Gain Output Source Current Output Sink Current FB Input Bias Current Feedback Voltage COMP High Voltage ...

Page 5

ELECTRICAL CHARACTERISTICS ( Characteristic GATE DRIVERS AND BOOST CLAMP HSDRV Pullup Resistance HSDRV Pulldown Resistance LSDRV Pullup Resistance LSDRV Pulldown Resistance HSDRV Falling to LSDRV Rising Delay LSDRV Falling to HSDRV Rising Delay Boost Clamp Voltage THERMAL SHUTDOWN Thermal Shutdown ...

Page 6

... Figure 5. Load Regulation vs Input Voltage Input = 12 V, Output = 3.3 V, Load = 9 A, CH4 (Purple CH2 (Red OUT CH3 (Green) = VHSDR, CH1 (Blue) = SWN CH1 = CH3: 5.0 V/div, CH2: 10 mV/div, CH4: 100 mV/div Time Scale: 400 ns/div Figure 7. Switching Waveforms (NCP3030A 3.3 V out ...

Page 7

... TEMPERATURE (°C) Figure 13. Input Undervoltage vs Temperature 1250 1225 1200 1175 1150 1125 1100 1075 1050 −40 −25 − 110 125 Figure 10. Switching Frequency vs Input Voltage and Temperature, NCP3030A 1.45 1.43 1.41 1.39 1.37 1.35 1.33 1.31 1.29 1.27 1. 110 125 −40 −25 −10 Figure 12. Transconductance vs Temperature 1200 1100 ...

Page 8

TYPICAL PERFORMANCE CHARACTERISTICS 1000 950 900 850 800 750 700 650 600 550 500 450 400 −40 −25 − TEMPERATURE (°C) Figure 15. Ramp Valley Voltage vs Temperature Input = 12 V, Output = 3.3 V, ...

Page 9

... Some overshoot may be evident at the start of each step depending on the voltage loop phase margin and bandwidth. The total soft−start time is 1.8 ms for the NCP3030A and 1.3 ms for the NCP3030B Steps 32 Voltage Steps Figure 20. Soft−Start Details http://onsemi ...

Page 10

OOV and OUV The output voltage of the buck converter is monitored at the feedback pin of the output power stage. Two comparators are placed on the feedback node of the OTA to monitor the operating window of the feedback ...

Page 11

V (vref *125%) 0.8 V (vref *100%) 0.6 V (vref *75%) FB Voltage Latch off Reinitiate Softstart Softstart Complete Figure 23. Powerup Sequence and Overvoltage Latch 1.0 V (vref *125%) 0.8 V (vref *100%) 0.6 V (vref * 75%) ...

Page 12

CURRENT LIMIT AND CURRENT LIMIT SET Overview The NCP3030 uses the voltage drop across the High Side MOSFET during the on time to sense inductor current. The Ilim Out CONTROL 6 DAC / COUNTER Itrip Ref−63 Steps, 6.51 mV/step Current ...

Page 13

No Trip: Vsense < I Itrip Ref Vsense ¾ Ton−2 1/4 1/2 3/4 Ton−1 Each switching cycle’s Ton is counted time steps. The 3/4 sample time value is held and used for the following cycle’s limit sample ...

Page 14

Reduced sampling time occurs at high duty cycles where the low side MOSFET is off for the majority of the switching period. Reduced sampling time causes errors in the regulated voltage on the boost pin. High duty cycle / input ...

Page 15

VIN VBOOST Maximum Normal VIN VBOOST Maximum Normal VIN VBOOST Figure 29. Typical Waveforms for Region 1 (top), Region 2 (middle), and Region 3 (bottom) To illustrate, a 0.1 mF boost capacitor operating at > 80% duty cycle and > ...

Page 16

Voltage Ripple Maximum Allowable Voltage 16 Maximum Boost Voltage 4.5 Inductor Selection When selecting the inductor important to know the input and output requirements. Some example conditions are listed ...

Page 17

... In contrast, smaller values of inductance increase the regulator’s maximum achievable slew rate and decrease the necessary capacitance, at the expense of higher ripple current. The peak−to−peak ripple current for the NCP3030A is given by the following equation 3.3 V out ...

Page 18

... The output capacitor must be rated to handle the ripple current at full load with proper derating. The RMS ratings given in datasheets are generally for lower switching frequency than used in switch mode power supplies but a multiplier is usually given for higher frequency operation. The RMS current for the output capacitor can be calculated ...

Page 19

... I : output current from the high−side gate drive (HSDR output current from the low−side gate drive (LSDR) G2 ƒ : switching frequency of the converter. NCP3030A is (eq. 29 1.2 MHz and NCP3030B is 2.4 MHz gate drive voltage for the high−side drive, typically BST 7 ...

Page 20

... HL d(OFF)_CONTROL The MOSFET parameters d(ON found in their appropriate datasheets for specific conditions. NOL and NOL are the dead times which LH HL were described earlier and are 85 ns and 75 ns, respectively. Feedback and Compensation The NCP3030 is a voltage mode buck convertor with a transconductance error amplifier compensated by an external compensation network ...

Page 21

Compensation Type II This compensation is suitable for electrolytic capacitors. Components of the Type II (Figure 34) network can be specified by the following equations: Figure 34. Type II Compensation ...

Page 22

IN− 1 IN− 2/3 IN− 4 VCC COMP GND Figure 36. Typical Application, V Reference Designator CIN−1 270 mF CIN− CIN− CIN− CC1 ...

Page 23

... *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “ ...

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