SL34063A [SLS]
DC-TO-DC CONVERTER CONTROL CIRCUITS; DC- TO- DC转换器控制电路
| 型号： | SL34063A |
| 厂家： | 
SYSTEM LOGIC SEMICONDUCTOR |
| 描述： | DC-TO-DC CONVERTER CONTROL CIRCUITS |
| 文件： | 总2页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SL34063A
DC-TO-DC CONVERTER CONTROL CIRCUITS
The SL34063A is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These
devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with
an active current limit circuit, driver and high current output switch. This series was specifically designed to be
incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external
components.
FEATURES
FUNCTIONAL BLOCK DIAGRAM
· Operation from 3.0 V to 40 V Input
· Low Standby Current
· Current Limiting
· Output Switch Current to 1.5 A
· Output Voltage Adjustable
· Frequency Operation to 100 kHz
· Precision 2% Reference
MAXIMUM RATINGS
Rating
Power Supply Voltage
Symbol
VCC
Value
40
Unit
Vdc
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (Vpin 1 = 40 V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
VIR
-0.3 to +40 Vdc
VC(switch)
VE(switch)
VCE(switch)
IC(driver)
IC(driver)
ISW
40
Vdc
Vdc
Vdc
Vdc
mA
A
40
40
40
Driver Collector Current (Note 1)
Switch Current
100
1.5
Power Dissipation and Thermal Characteristics
Ceramic Package, U Suffix TA = +25°C
Thermal Resistance
Plastic Package, P Suffix TA = +25°C
Thermal Resistance
SOIC Package, D Suffix TA = +25°C
Thermal Resistance
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
PD
RqJA
PD
RqJA
PD
RqJA
TJ
1.25
100
1.25
100
625
160
+150
0 to +70
-65to+150 °C
W
°C/W
W
°C/W
mW °C/
W
°C
°C
TA
Tstg
System Logic
SLS
Semiconductor
1
SL34063A
ORDERING INFORMATION
Pin connection
Device
Temperature Range Package
34063AD 0° to +70°C
34063AP1
SO-8
Plastic DIP
ELECTRICAL CHARACTERICISTICS
(VCC = 5.0 V, TA= 0 to +70oC unless otherwise specified.)
Characteristics
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Discharge to Charge Current Ratio (Pin7 to Vcc, TA=25°C)
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)
fosc
Ichg
24
24
140
33
33
200
6.2
300
42
42
260
7.5
350
kHz
mA
mA
—
mV
Idischg
Idischg/Ichg 5.2
Vlpk(sense) 250
OUTPUT SWITCH (Note 3)
Saturation Voltage, Darlington Connection (ISW = 1.0 A,
Pins 1, 8 connected)
VCE(sat)
—
—
1.0
1.3
0.7
V
V
Saturation Voltage (ISW = 1.0 A, RPin 8 = 82 W to VCC.
Forced b = 20)
VCE(sat)
0.45
=
DC Current Gain (ISW = 1.0 A, VCE 5.0 V, TA = 25°C)
hFE
IC(off)
50
—
120
0.01
—
100
—
mA
Collector Off-State Current (VCE = 40V)
COMPARATOR
Threshold Voltage (TA = 25°C)
(TA = TLOW to THIGH
Threshold Voltage (TA = 25°C) **
Vth
1.225
1.21
1.2375
1.25
—
1.25
1.275
1.29
1.2625
V
)
Vth
V
Threshold Voltage Line Regulation (VCC = 3 0 V to 40 V)
Input Bias Current (Vin=0V)
Regime
IIB
1.4
-40
5.0
-400
mV
nA
—
TOTAL DEVICE
Supply Current (VCC = 5 0 V to 40 V, CT = 1 0 nF, Vpin7 = VCC
VPin5 > Vth, Pin 2 = Gnd, Remaining pins open)
.
ICC
2.5
4.0
mA
NOTES:
1. Maximum package power dissipation limits must be observed.
2.Low duty cycle pulse techniques are used during test to maintain Junction temperature as close to ambient temperature as
possible
3.If the output switch is driven into hard saturation (non Darlington configuration) at low switch currents (< 300 mA) and high
driver currents (>30 mA), it may take up to 2.0 ms to come out of saturation This condition will shorten the off' time at
frequencies > 30 kHz, and is magnified at high temperatures This condition does not occur with a Darlington configuration,
since the output switch cannot saturate If a non Darlington configuration is used, the following output drive condition is
recommended
Forced b of output switch = IC, output/(Ic, driver -7.0 mA*) > 10
*The 100 W. resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts
**Possible version for shipment
System Logic
SLS
Semiconductor
2
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