L4990 Просмотр технического описания (PDF) - STMicroelectronics
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L4990 Datasheet PDF : 24 Pages
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L4990 - L4990A
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
IOUT
Ptot
Tj
Tstg
Parameter
Supply Voltage (ICC < 50mA) (*)
Output Peak Pulse Current
Analog Inputs & Outputs (6,7)
Analog Inputs & Outputs (1,2,3,4,5,15,14 13)
Power Dissipation @ Tamb = 70°C
Junction Temperature, Operating Range
Storage Temperature, Operating Range
(*) maximum package power dissipation limits must be observed
Value
selflimit
1.5
-0.3 to 8
-0.3 to 6
1
-25 to 125
-55 to 150
Unit
V
A
V
V
W
°C
°C
PIN CONNECTION
SYNC
RCT
DC
VREF
VFB
COMP
SS
VCC
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
D95IN197
THERMAL DATA
Symbol
Rth j-amb
Rth j-amb
Parameter
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Ambient
N.C.
DC-LIM
DIS
ISEN
SGND
PGND
OUT
VC
DIP16
SO16
Value
80
120
Unit
°C/W
°C/W
PIN FUNCTIONS
N.
Name
1
SYNC
2
RCT
3
DC
4
VREF
5
VFB
6
COMP
7
SS
8
VCC
9
VC
10
OUT
11
PGND
12
SGND
13
ISEN
14
DIS
15
DC-LIM
16
NC
Fun ction
Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct
Oscillator pin for external Ct, Rt components
Duty Cycle control
5.0V +/-1.5% reference voltage
Error Amplifier Inverting input
Error Amplifier Output
Soft start pin for external capacitor Css
Supply for internal ”Signal” circuitry
Supply for Power section
High current totem pole output
Power ground
Signal ground
Current sense
Disable. It must never be left floating. Tie to SGND if not used.
Connecting this pin to Vref, DC is limited to 50%. If it is left floating or grounded no limitation is
imposed
Not connected
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