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KP1500 데이터시트 PDF




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부품번호 KP1500 기능
기능 3A PWM Buck Switching Regulator
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KP1500 데이터시트, 핀배열, 회로
www.DataSheet4U.com
150Khz, 3A PWM Buck Switching Regulator
KP1500
„ General Description
„ Features
The KP1500 series are monolithic integrated
circuits that provide all the active functions for a
step-down DC/DC converter, capable of driving a
3A load without additional transistor component.
Requiring a minimum number of external
component, the board space can be saved easily.
The external shutdown function can be controlled
by TTL logic level and then come into standby
mode. The internal compensation makes feedback
control have good line and load regulation without
external design. Regarding protected function,
thermal shutdown is to prevent over temperature
operating from damage, and current limit is against
over current operating of the output switch. The
KP1500 series operates at a switching frequency of
150Khz thus allowing smaller sized filter
components than what would be needed with lower
frequency switching regulators. Other features
include a guaranteed +4% tolerance on output
voltage under specified input voltage and output
load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 5-lead TO-220(T) package
and a 5-lead TO-263(S).
- 3.3V, 5V, 12V and adjustable output versions
- Adjustable version output voltage range, 1.23V to
28V +4% max over line and load condiction
- Available in TO220-5L and TO263-5L packages
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON/OFF shutdown control input
- Input voltage range up to 32V
- Output load current: 3A
- 150 kHz fixed frequency internal oscillator
- Low power standby mode
- Built-in switching transistor on chip
„ Applications
- Simple High-efficiency step-down(buck) regulator
- Efficient preregulator for linear regulators
- On-card switching regulators
- Positive to negative converter
- Battery Charger
„ Pin Assignments
( Top View )
Metal Tab GND
TO263-5L
5 SD
4 FB
3 Gnd
2 Output
1 VIN
( Top View )
TO220-5L
5 SD
4 FB
3 Gnd
2 Output
1 VIN
„ Pin Descriptions
Name
VIN
Output
Gnd
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
This datasheet contains new product information. Kalai Technology Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of
the use of this product. No rights under any patent accompany the sale of the product.
Rev. 2.0, Feb.15, 2006
1/10
KALAI TECHNOLOGY CORPORATION




KP1500 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
150Khz, 3A PWM Buck Switching Regulator
KP1500
„ Electrical Characteristics (Continued)
KP1500-ADJ
KP1500-3.3V
KP1500-5V
KP1500-12V
Symbol
VFB
η
VOUT
η
VOUT
η
VOUT
η
Parameter
Output
Feedback
Efficiency
Conditions
5V < VIN < 32V
0.2A < ILOAD < 3A
VOUT programmed for
3V
VIN = 12V, ILOAD=3A
Typ.
1.23
73
Output voltage
5.5V < VIN < 32V
0.2A < ILOAD < 3A
3.3
Efficiency VIN = 12V, ILOAD=3A 73
Output voltage
8V < VIN < 32V
0.2A < ILOAD < 3A
5
Efficiency VIN = 12V, ILOAD=3A 80
Output voltage
15V < VIN < 32V
0.2A < ILOAD < 3A
12
Efficiency VIN = 15V, ILOAD = 3A 90
Limit
1.193/1.18
1.267/1.28
3.168/3.135
3.432/3.465
4.8/4.75
5.2/5.25
11.52/11.4
12.48/12.6
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Unit
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
Kalai Technology Corp.
www.kalai.com.tw
4/10
Rev.2.0 Feb.15, 2006

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KP1500 전자부품, 판매, 대치품
www.DataSheet4U.com
150Khz, 3A PWM Buck Switching Regulator
„ Typical Application Circuit
12V
DC Input
Cin
680uF
FB
1
Vin
4
KP1500
-33 2
Output
53
SD Gnd
L1
33uF
D1
1N5824
KP1500
3.3V/3A
Output Load
Co
470uF
„ Function Description
Pin Functions
+VIN
This is the positive input supply for the IC switching
regulator. A suitable input bypass capacitor must be
present at this pin to minimize voltage transients
and to supply the switching currents needed by the
regulator.
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches
between (+VIN – VSAT) and approximately – 0.5V,
with a duty cycle of approximately VOUT / VIN. To
minimize coupling to sensitive circuitry, the PC
board copper area connected to this pin should be
kept a minimum.
Feedback
Senses the regulated output voltage to complete
the feedback loop.
ON /OFF
Allows the switching regulator circuit to be
shutdown using logic level signals thus dropping
the total input supply current to approximately
150uA. Pulling this pin below a threshold voltage of
approximately 1.3V turns the regulator on, and
pulling this pin above 1.3V (up to a maximum of
25V) shuts the regulator down. If this shutdown
feature is not needed, the ON /OFF pin can be
wired to the ground pin or it can be left open, in
either case the regulator will be in the ON condition.
Thermal Considerations
The KP1500 is available in two packages, a 5-pin
TO-220 and a 5-pin surface mount TO-263.
The TO-220 package needs a heat sink under most
conditions. The size of the heatsink depends on the
input voltage, the output voltage, the load current
and the ambient temperature. The KP1500 junction
temperature rises above ambient temperature for a
3A load and different input and output voltages.
The data for these curves was taken with the
KP1500 (TO-220 package) operating as a buck
switching regulator in an ambient temperature of
25oC (still air). These temperature rise numbers are
all approximate and there are many factors that can
affect these temperatures. Higher ambient
temperatures require more heat sinking.
The TO-263 surface mount package tab is
designed to be soldered to the copper on a printed
circuit board. The copper and the board are the
heat sink
for this package and the other heat producing
components, such as the catch diode and inductor.
The PC board copper area that the package is
soldered to should be at least 0.8 in2, and ideally
should have 2 or more square inches of 2 oz.
Additional copper area improves the thermal
characteristics, but with copper areas greater than
approximately 6 in2, only small improvements in
heat dissipation are realized. If further thermal
improvements are needed, double sided, multilayer
PC board with large copper areas and/or airflow are
recommended.
Kalai Technology Corp.
www.kalai.com.tw
7/10
Rev.2.0 Feb.15, 2006

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