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L5993 Datasheet

CONSTANT POWER CONTROLLER

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L5993 pdf
® L5993
CONSTANT POWER CONTROLLER
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UP CURRENT (< 120µA)
CONSTANT OUTPUT POWER VS. SWITCH-
ING FREQUENCY
HIGH-CURRENT OUTPUT DRIVE SUITABLE
FOR POWER MOSFET (1A)
FULLY LATCHED PWM LOGIC WITH DOU-
BLE PULSE SUPPRESSION
PROGRAMMABLE DUTY CYCLE
100%AND 50% MAXIMUM DUTY CYCLE LIMIT
PROGRAMMABLE SOFT START
PRIMARY OVERCURRENT FAULT DETEC-
TION WITH RE-START DELAY
PWM UVLO WITH HYSTERESIS
IN/OUT SYNCHRONIZATION
LATCHED DISABLE
INTERNAL 100ns LEADING EDGE BLANK-
ING OF CURRENT SENSE
PACKAGE: DIP16 AND SO16N
DESCRIPTION
This primary controller I.C., developed in BCD60II
technology, has been designed to implement off
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
DIP16
SO16N
ORDERING NUMBERS: L5993 (DIP16)
L5993D (SO16)
line or DC-DC power supply applications using a
fixed frequency current mode control.
Based on a standard current mode PWM control-
ler this device includes some features such as
programmable soft start, IN/OUT synchronization,
disable (to be used for over voltage protection and
for power management), precise maximum Duty
Cycle Control, 100ns leading edge blanking on
current sense, pulse by pulse current limit, over-
current protection with soft start intervention and
”constant power” function for cotrolling throughput
power in multisync monitor SMPS.
RCT
DC
DIS
C-POWER
ISEN
SS
SYNC
1
DC-LIM
15
VCC
8
2
TIMING
+
3
-
25V
+
T 15V/10V -
14 -
+
2.5V
DIS
+
16 -
BLANKING
SQ
R
PWM
OVER CURRENT
13
+
-
1.2V
FAULT
SOFT-START
VREF OK
CLK
DIS
7
2R
1V R
Vref
PWM UVLO
VREF
4
9
13V 10
11
+ 2.5V
E/A
-
5
VC
OUT
PGND
VFB
12
SGND
6
COMP
D97IN765
July 1999
1/22


STMicroelectronics Electronic Components Datasheet

L5993 Datasheet

CONSTANT POWER CONTROLLER

No Preview Available !

L5993 pdf
L5993
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, 16)
Power Dissipation @ Tamb = 70°C (DIP16)
@ Tamb = 50°C (SO16)
Junction Temperature, Operating Range
Storage Temperature, Operating Range
(*) maximum package power dissipation limits must be observed
PIN CONNECTION
Value
selflimit
1.5
-0.3 to 8
-0.3 to 6
1
0.83
-40 to 150
-55 to 150
Unit
V
A
V
V
W
W
°C
°C
SYNC
RCT
DC
VREF
VFB
COMP
SS
VCC
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
D97IN783
C-POWER
DC-LIM
DIS
ISEN
SGND
PGND
OUT
VC
THERMAL DATA
Symbol
Parameter
Rth j-amb
Thermal Resistance Junction -Ambient (DIP16)
Thermal Resistance Junction -Ambient (SO16)
PIN FUNCTIONS
Value
80
120
Unit
°C/W
°C/W
N. Name
Fun ction
1 SYNC Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct
2
RCT
Oscillator pin for external Ct, Rt components
3 DC Duty Cycle control
4 VREF 5.0V +/-1.5% reference voltage at 25°C
5
VFB
Error Amplifier Inverting input
6 COMP Error Amplifier Output
7 SS Soft start pin for external capacitor Css
8 VCC Supply for internal ”Signal” circuitry
9 VC 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 C-POWER Constant Power vs. Switching Frequency. Connect a capacitor to SGND. The pin must be
connected to VREF if not used.
2/22


Part Number L5993
Description CONSTANT POWER CONTROLLER
Maker STMicroelectronics
Total Page 22 Pages
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