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PDF GM34063 Data sheet ( Hoja de datos )
| Número de pieza | GM34063 | |
| Descripción | 1.5A DC-TO-DC CONVERTER CONTROL CIRCUIT | |
| Fabricantes | Gamma Microelectronics | |
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AA
MICROELECTRONICS
Power Management
GM34063
1.5A DC-TO-DC CONVERTER CONTROL CIRCUIT
Description
GM34063 has all the functions required for DC-to-DC
converters: an internal temperature- compensated ref-
erence, comparator, controlled duty cycle oscillator
with an active current limit circuit, driver, and high-
current output switch.
GM34063 is designed for step-down, step-up and volt-
age-inverting applications by using a minimum number
of external components.
Features
3.0V to 40V input
Adjustable Output Voltage
Current Limiting
Output Switch Current to 1.5A
Low Standby Current
Operating Frequency to 100kHz
Precision 2% Reference
Application
CD-ROM
Motherboards
SMPS Power Supply
Battery Chargers
DSL Modem
SCHEMATIC DIAGRAM
8
Driver Collector
7
Ipk Sense
6
VCC
5
Comparator
Inverting Input
Ipk Oscillator
CT
SQ
Q2
R
100
Comparator
+
-
1.25V
Reference
Regulator
(Bottom View)
1
Switch Collector
Q1
2
Switch Emitter
3
Timing Capacitor
4
GND
www.gammamicro.com 1
1 page  
AA
MICROELECTRONICS
Power Management
GM34063
1.5A DC-to-DC CONVERTER CONTROL CIRCUIT
Typical Performance Characteristics
2
1.8
1.6
1.4
1.2
1
0.8
0.6 VCC = 5V
0.4 Pin1, 7, 8 =VCC
Pin 3, 5 = GND
0.2 TA = 25°C
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
IE Emitter current (A)
Figure 1:Emitter Follows Configuration
Output
1.4
1.3 Darlington Connection
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
VCC = 5V
Pin 7 = VCC
Pins 2, 3, 5 = GND
0.2 TA= 25°C
0.1
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
IC, Collector Current(A)
Figure 3: Common Emitter Configuration
Output Switch Saturation Voltage versus
Collector Current
3.6
3.2
2.8
2.4
2
1.6
1.2
0.8 CT = 1.0 nF
0.4
Pin 7 = VCC
Pin 2 = GND
0
0 5 10 15 20 25 30 35 40
VCC, Supply Voltage (V)
Figure 2: Standley Supply Current Versus
Supply Voltage
VCE(sat)
(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 VCC = 5.0V
380 Ichg = Idischg
360
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
versus Temperature
1000
500
VCC = 5.0V
Pin 7 = VCC
200 Pin 5 = GND
TA = 25°C
100
50
20
ton
10
5.0 toff
2.0
0
0.01 0.02 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 versus
Oscillator Timing Capacitor
5
5 Page 
AA
MICROELECTRONICS
Power Management
GM34063
1.5A DC-to-DC CONVERTER CONTROL CIRCUIT
External Current Boost Connections for IC Peak Greater than 1.5A
RSC
VIN
81
S Q Q2
R Q1
7
Ipk Oscillator
CT
6
Comparator
+
-
1.25V
Reference
Regulator
2
3
54
Figure 8a. External NPN Switch
VOUT
RSC
VIN
8
1
S Q Q2
R Q1
7
Ipk Oscillator
2
CT
6
Comparator
+
-
1.25V
Reference
Regulator
3
54
Figure 8b. External NPN Switch
VOUT
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet GM34063.PDF ] | |
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