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L5991 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. L5991
Description  PRIMARY CONTROLLER WITH STANDBY
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5991 Datasheet(HTML) 2 Page - STMicroelectronics

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ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC
Supply Voltage (ICC < 50mA) (*)
selflimit
V
IOUT
Output Peak Pulse Current
1.5
A
Analog Inputs & Outputs (6,7)
-0.3 to 8
V
Analog Inputs & Outputs (1,2,3,4,5,15,14, 13, 16)
-0.3 to 6
V
Ptot
Power Dissipation @ Tamb = 70
°C (DIP16)
@ Tamb = 50
°C (SO16)
1
0.83
W
W
Tj
Junction Temperature, Operating Range
-40 to 150
°C
Tstg
Storage Temperature, Operating Range
-55 to 150
°C
(*) maximum package power dissipation limits must be observed
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal Resistance Junction -Ambient (DIP16)
80
°C/W
Thermal Resistance Junction -Ambient (SO16)
120
°C/W
PIN FUNCTIONS
N.
Name
Function
1
SYNC
Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct
2
RCT
Oscillator pin for external CT, RA, RB components
3
DC
Duty Cycle control
4
VREF
5.0V +/-1.5% reference voltage @ 25°C
5
VFB
Error Amplifier Inverting input
6
COMP
Error Amplifier Output
7
SS
Soft start pin for external capacitor Css
8VCC
Supply for internal "Signal" circuitry
9VC
Supply for Power section
10
OUT
High current totem pole output
11
PGND
Power ground
12
SGND
Signal ground
13
ISEN
Current sense
14
DIS
Disable. It must never be left floating. TIE to SGND if not used.
15
DC-LIM
Connecting this pin to Vref, DC is limited to 50%. If it is left floating or grounded no limitation is
imposed
16
ST-BY
Standby. Connect a resistor to RCT. Connect to VREF or floating if not used.
SYNC
RCT
DC
VREF
VFB
SS
COMP
1
3
2
4
5
6
7OUT
SGND
PGND
ISEN
DIS
DC-LIM
ST-BY
16
15
14
13
12
10
11
VCC
8VC
9
PIN CONNECTION
L5991 - L5991A
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