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PDF ( 数据手册 , 数据表 ) JC34063

零件编号 JC34063
描述 1.5A DC TO DC CONVERTER CONTROL
制造商 ETC
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JC34063 数据手册, 描述, 功能
JC34063 series
1.5A DC T O DC
CONVERTER CONT ROL
Description
JC34063 series have all the functions required for
DC-to-DC converters: an internal Temperature-
compensated reference, comparator, controlled duty
cycle oscillator with an active current limit circuit,
driver, and high current output switch.
JC34063 series are designed for step-down, step-up
and voltage-inverting applications by using a
minimum number of external components.
For JC34063E can operate for a temperature range
from -40°C to 125°C while JC34063F can operate
from -25°C to 85°C.
Features
‹ 3.0V to 40V Input
‹ Adjustable Output Voltage
‹ Output Switch Current to 1.5A
‹ Low Standby Current
‹ Operating Frequency to 100kHz
‹ Precision 1 % Reference available
Application
z CD-ROM
z Motherboards
z SMPS Power Supply
Schematic Diagram
z Battery Chargers
z DSL Modem
8
Driver Collector
7
IPK Sense
6
VCC
5
Comparator
Inverting Inpu t
1
Switch Collector
S Q Q2
R Q1
IPK Oscillator
CT
Comparator
+
-
100
1.25V
VREF
2
Switch Em itter
3
Timing Cap acitor
4
GND
1
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JC34063 pdf, 数据表
JC34063 series
1.5A DC T O DC
CONVERTER CONT ROL
Typical Performance Charac teri stics
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
VCC = 5V
Pin 1, 7, 8 = VCC
0.2
Pin 3, 5 = GND
TA = 25°C
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
lE Emitter current (A)
Figure 1: Emitter Follows Configuration
Output
1.4
1.3 Darlington Connection
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4 VCC = 5V
0.3 Pin 7 = VCC
0.2 Pin 2, 3, 5 = GND
0.1 TA = 25°C
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
IC Collector Current (A)
Figure 3: Common Emitter Configuration
Output Switch Saturation Voltage vs.
Collector Current
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8 CT = 1.0nF
0.4
Pin 7 = VCC
Pin 2 = GND
0
0 5 10 15 20 25 30 35 40
VCC Supply Voltage (V)
Figure 2: Standby Supply Current vs. Supply
Voltage
VCE (SA T)
(mV)
1000
VCC = 5V
IC = 1A
950
900
850
800
750-40
0
40 80 120 TJ (°C)
Figure 4: Darlington Configuration Collector
Emitter Saturation Voltage (VCE(SAT)) vs.
Temperature
400
380
360
VCC = 5V
Ichg = Idischg
340
320
300
280
260
240
220
200
-55 -25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 5: Current Limit Sense Voltage
Vs. Temperature
1000
500
200
100
50
VCC = 5V
Pin 7 = VCC
Pin 5 = GND
TA = 25°C
20
ton
10
5.0 toff
2.0
1.0
0.02 0.01 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10
CT, Oscillator Timing Capacitor (nF)
Figure 6: Output Switch On-Off Time vs.
Oscillator Timing Capacitor
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