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부품번호 | AP65550 기능 |
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기능 | 650kHz ADAPTIVE COT STEP-DOWN CONVERTER | ||
제조업체 | Diodes | ||
로고 | |||
전체 14 페이지수
AP65550
5A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Description
Pin Assignments
The AP65550 is an adaptive constant on-time mode synchronous
buck converter providing high efficiency, excellent transient response
and high DC output accuracy for low-voltage regulation in digital TV
and monitor.
The constant-on-time control scheme handles wide input/output
voltage ratios and provides low external component count. The
internal proprietary circuit enables the device to adopt both low
equivalent series resistance (ESR) output capacitors, such as SP-
CAP or POSCAP and ultra-low ESR ceramic capacitors.
The adaptive on-time control supports seamless transition between
continuous conduction mode (CCM) at higher load conditions and
discontinuous conduction mode (DCM) at lighter load conditions.
DCM allows AP65550 maintain high efficiency at light load conditions.
The AP65550 also features programmable soft-start, UVLO, OTP and
OCP to protect the circuit.
This IC is available in SO-8EP package.
Features
Fixed Frequency Emulated Constant On-time Control
Good Stability Independent of the Output Capacitor ESR
Fast Load Transient Response
Synchronous Rectification: 65mΩ Internal High-side Switch and
36mΩ Internal Low-side Switch
Wide Input Voltage Range: 4.5V to 18V
Output Voltage Range: 0.76V to 6V
5A Continuous Output Current
650kHz Switching Frequency
Built-in Over Current Limit
Built-in Thermal Shutdown Protection
Programmable Soft-start
Pre-biased Start-up
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
( Top View )
EN 1
FB 2
VREG5 3
SS 4
8
7
6
5
SO-8EP
Applications
Gaming Consoles
Flat Screen TV sets and Monitors
Set Top Boxes
Distributed power systems
Home Audio
Consumer electronics
Network Systems
FPGA, DSP and ASIC Supplies
Green Electronics
VIN
BS
SW
GND
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
INPUT
VIN
12V
C1
20μF
8
IN
ON 1
OFF
EN
C4
8.2nF
4
SS
7
BST
6
SW
AP65550
5
GND
2
FB
3
VREG5
C5 L1
0.1µF 1.5μH
R1
8.25kΩ
R2
22.1kΩ
C3
1µF
OUTPUT
VOUT
1.05V
C2
44μF
Figure 1. Typical Application Circuit
AP65550
Document number: DS36336 Rev. 2 - 2
1 of 14
www.diodes.com
April 2014
© Diodes Incorporated
http://www.Datasheet4U.com
Electrical Characteristics (@TA = +25°C, VIN = 12V, unless otherwise specified.)
Parameter
SUPPLY VOLTAGE (VIN PIN)
Input Voltage
Quiescent Current
Shutdown Supply Current
UNDER VOLTAGE LOCKOUT
UVLO Threshold
UVLO Hysteresis
ENABLE (EN PIN)
EN High-level Input Voltage
EN Low-level Input Voltage
VOLTAGE REFERENCE (FB PIN)
Feedback Voltage
Feedback Bias Current
VREG5 OUTPUT
VREG5 Output Voltage
Source Current Capability
Load Regulation
Line Regulation
MOSFET
High-side Switch On-resistance
Low-side Switch On-resistance
CURRENT LIMIT
High Level Current Limit
ON-TIME TIMER
On Time
Minimum Off Time
THERMAL SHUTDOWN
Thermal Shutdown
Thermal Shutdown Hysteresis
SOFT START (SS PIN)
Soft-start Source Current
Soft-start Discharge Current
Symbol
VIN
IQ
ISHDN
VUVLO
VHYS
VENH
VENL
VFB
IFB
VVREG5
—
—
—
RDSONH
RDSONL
ILIM-H
tON
tOFF-MIN
TOTSD
THYS
ISS-SOURCE
ISS-DISCHARGE
Conditions
—
VFB=0.85V
VEN=0V
VIN Rising Test VREG5
Voltage
VIN Falling Test VREG5
Voltage
—
—
VOUT=1.05V
VFB=0.8V
6.0V<VIN<18V 0<IVREG5<5mA
VIN=6V, VVREG5=4V
0<IVREG5<5mA
6.0V<VIN<18V IVREG5=5mA
—
—
L=1.5μH
VIN=12V, VOUT=1.05V
VFB=0.7V
—
—
VSS=1V
VSS=0.5V
Min
4.5
—
—
3.45
0.19
1.9
—
0.753
-0.1
4.7
—
—
—
—
—
5.6
—
—
—
—
4.2
0.1
Typ
—
0.9
3.6
3.75
0.32
—
—
0.765
0
5.1
110
—
—
0.065
0.036
6.4
150
260
+160
+30
6.0
0.2
Max
18
—
10
4.05
0.45
—
0.6
0.777
0.1
5.5
—
60
20
—
—
7.9
—
310
—
—
7.8
—
AP65550
Unit
V
mA
μA
V
V
V
V
V
μA
V
mA
mV
mV
Ω
Ω
A
ns
ns
°C
°C
μA
mA
AP65550
Document number: DS36336 Rev. 2 - 2
4 of 14
www.diodes.com
April 2014
© Diodes Incorporated
http://www.Datasheet4U.com
4페이지 AP65550
Typical Performance Characteristics (cont.)
(@TA = +25°C, VIN = 12V, VOUT = 1.05V, L = 1.5µH, C1 = 20µF, C2 = 44µF, unless otherwise specified.)
Steady State Test 5A
VIN_AC (1V/DIV)
VOUT_AC (50mV/DIV)
Startup Through VIN No Load
VIN (12V/DIV)
VOUT (1V/DIV)
Startup Through VIN 5A Load
VIN (12V/DIV)
VOUT (1V/DIV)
ISW (2A/DIV)
IOUT (1A/DIV)
IOUT (5A/DIV)
SW (10V/DIV)
Time-1µs/div
SW (10V/DIV)
Time-500µs/div
SW (10V/DIV)
Time-500µs/div
Steady State Test 5A
VIN_AC (1V/DIV)
VOUT_AC (50mV/DIV)
ISW (2A/DIV)
SW (10V/DIV)
Time-50ns/div
Shutdown Through VIN No load
VIN (12V/DIV)
VOUT (1V/DIV)
IOUT (1A/DIV)
SW (10V/DIV)
Time-50ms/div
Shutdown Through VIN 5A Load
VIN (12V/DIV)
VOUT (1V/DIV)
IOUT (5A/DIV)
SW (10V/DIV)
Time-50ms/div
Startup Through VEN No Load
VEN (3V/DIV)
VOUT (1V/DIV)
IOUT (1A/DIV)
SW (10V/DIV)
Time-1ms/div
Shutdown Through VEN No load
VEN (3V/DIV)
VOUT (1V/DIV)
IOUT (1A/DIV)
SW (10V/DIV)
Time-20ms/div
Startup Through VEN 5A Load
VEN (3V/DIV)
VOUT (1V/DIV)
IOUT (5A/DIV)
SW (10V/DIV)
Time-2ms/div
Shutdown Through VEN 5A Load
VEN (3V/DIV)
VOUT (1V/DIV)
IOUT (5A/DIV)
SW (10V/DIV)
Time-20ms/div
Short Circuit Test
VOUT (500mV/DIV)
IOUT (2A/DIV)
Time-100µs/div
Short Circuit Recovery
VOUT (500mV/DIV)
IOUT (2A/DIV)
Time-1ms/div
AP65550
Document number: DS36336 Rev. 2 - 2
7 of 14
www.diodes.com
April 2014
© Diodes Incorporated
http://www.Datasheet4U.com
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
AP65550 | 650kHz ADAPTIVE COT STEP-DOWN CONVERTER | Diodes |
AP65552 | 650kHz ADAPTIVE CCM/COT STEP-DOWN CONVERTER | Diodes |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |