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부품번호 | NCP1595 기능 |
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기능 | Current Mode PWM Converter | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 12 페이지수
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NCP1595, NCP1595A
Current Mode PWM
Converter for Low Voltage
Outputs
The NCP1595/NCP1595A is a current mode PWM buck converter
with integrated power switch and synchronous rectifier. It can provide
up to 1.5 A output current with high conversion efficiency. High
frequency PWM control scheme can provide a low output ripple noise.
Thus, it allows the usage of small size passive components to reduce
the board space. In a low load condition, the controller will
automatically change to PFM mode for provides a higher efficiency at
low load. Additionally, the device includes soft−start, thermal
shutdown with hysteresis, cycle−by−cycle current limit, and short
circuit protection. This device is available in compact 3x3 DFN
package.
Features
• High Efficiency 95% @ 3.375 V
• Synchronous Rectification for Higher Efficiency in PWM Mode
• Integrated MOSFET
• Fully Internal Compensation
• High Switching Frequency, 1.0 MHz
• Low Output Ripple
• Cycle−by−cycle Current Limit
• Current Mode Control
• Short Circuit Protection
• Built−in Slope Compensation for Current Mode PWM Converter
• $1.5% Reference Voltage
• Thermal Shutdown with Hysteresis
• Ext. Adjustable Output Voltage
• Fast Transient Response
• Low Profile and Minimum External Components
• Designed for Use with Ceramic Capacitor
• Compact 3x3 DFN Package
• These are Pb−Free Devices
Typical Applications
• Hard Disk Drives
• USB Power Device
• Wireless and DSL Modems
http://onsemi.com
1
DFN6 3*3 MM, 0.95 PITCH
CASE 506AH
MARKING DIAGRAMS
1 N1595
ALYW
G
1 1595A
ALYW
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PIN CONNECTIONS
FB
GND
LX
1595
NC
VCC
VCCP
FB
GND
LX
EN
VCC
VCCP
1595A
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 2
1
Publication Order Number:
NCP1595/D
NCP1595, NCP1595A
PIN FUNCTION DESCRIPTIONS
Pin #
Symbol
Pin Description
NCP1595
1 FB Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
2
GND
Ground
3 LX Pin connected internally to power switch. Connect externally to inductor.
4
VCCP
Power connection to the power switch.
5
VCC
IC power connection.
6 NC No Connection
NCP1595A
1 FB Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
2
GND
Ground
3 LX Pin connected internally to power switch. Connect externally to inductor.
4
VCCP
Power connection to the power switch.
5
VCC
IC power connection.
6 EN Device Enable pin. This pin has an internal current source pull up. No connect is enable the device. With this
pin pulled down below 0.4 V, the device is disabled and enters the shutdown mode.
VCC
NC/EN
VIN
C1
FB
Power Reset
Under Voltage
Logout
Thermal
Shutdown
Over Voltage
Protection
Soft Start
+
−
+
Oscillator
−
+
−
+
Control Logic
Figure 2. Detail Block Diagram
VCCP
LX L1
VOUT = 0.8 V
to 0.9 VIN
GND
R1
C2
R2
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4
4페이지 NCP1595, NCP1595A
1.5
VOUT = 3.3 V
1.0 L = 3.3 mH
CIN = 22 mF
0.5 COUT = 22 mF
0.0
−0.5
−1.0
−1.5
10
100
VIN = 4.0 V
VIN = 5.0 V
1000
10000
100
90
80
70
60
50
40
30
20
10
VIN = 5.0 V
VIN = 4.0 V
VOUT = 3.3 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
100
1000
10000
Figure 9. Output Voltage Change vs. Output
Current
Figure 10. Efficiency vs. Output Current
1.5
VOUT = 1.8 V
1.0 L = 3.3 mH
CIN = 22 mF
0.5 COUT = 22 mF
0.0
−0.5
−1.0
−1.5
10
100
VIN = 4.0 V
VIN = 5.0 V
1000
10000
100
90
80
70
60
50
40
30
20
10
VIN = 4.0 V
VIN = 5.0 V
VOUT = 1.8 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
100
1000
10000
Figure 11. Output Voltage Change vs.
Output Current
Figure 12. Efficiency vs. Output Current
1.5
VOUT = 1.2 V
1.0 L = 3.3 mH
CIN = 22 mF
0.5 COUT = 22 mF
0.0
−0.5
−1.0
−1.5
10
100
VIN = 4.0 V
VIN = 5.0 V
1000
10000
100
90 VIN = 4.0 V
80
70 VIN = 5.0 V
60
50
40
30
20
10 100
VOUT = 1.2 V
L = 3.3 mH
CIN = 22 mF
COUT = 22 mF
1000
10000
Figure 14. Output Voltage Change vs.
Output Current
Figure 13. Efficiency vs. Output Current
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7
7페이지 | |||
구 성 | 총 12 페이지수 | ||
다운로드 | [ NCP1595.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |