L5991D STMicroelectronics, L5991D Datasheet

IC PRIMARY CTRLR W/STANDBY SO16

L5991D

Manufacturer Part Number
L5991D
Description
IC PRIMARY CTRLR W/STANDBY SO16
Manufacturer
STMicroelectronics
Datasheet

Specifications of L5991D

Mfg Application Notes
25W Off-Line Battery Charger with L5991A AppNote 300W Forward Converter with L5991A AppNote 45W AC-DC Adapter with Standby AppNote 60W Power Supply using the L5991 AppNote 80W Adapter using L6561/L5991A AppNote 90W SMPS for Monitors with Standby AppNote Trick Enhances L5991s Standby Function AppNote L5991-Based Converter, Temp Extra Power AppNote Auxiliary Power Supply Design AppNote Minimize Power Losses AppNote
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
1MHz
Duty Cycle
93%
Voltage - Supply
11 V ~ 20 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
0°C ~ 105°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
1MHz
Duty Cycle (max)
93 %
Output Voltage
5.075 V
Output Current
1500 mA
Mounting Style
SMD/SMT
Switching Frequency
1000 KHz
Operating Supply Voltage
12 V to 20 V
Maximum Operating Temperature
+ 150 C
Fall Time
35 ns
Minimum Operating Temperature
- 40 C
Rise Time
70 ns
Synchronous Pin
Yes
Topology
Boost, Flyback
Number Of Pwm Outputs
1
On/off Pin
No
Adjustable Output
No
Switching Freq
1MHz
Operating Supply Voltage (max)
20V
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
16
Package Type
SO
For Use With
497-8226 - BOARD EVAL L5991/STP12NK80Z497-6416 - BOARD EVAL L5991/STP10NK60Z497-5083 - EVAL BOARD 3PH PWR SUPPLY W/ESBT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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DESCRIPTION
This primary controller I.C., developed in BCD60II
technology, has been designed to implement off
BLOCK DIAGRAM
August 2001
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UP CURRENT (< 120 A)
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
STANDBY FUNCTION
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 SO16
ISEN
RCT
DIS
DC
SS
®
2
3
14
13
7
2.5V
1.2V
OVER CURRENT
+
+
+
-
-
-
DIS
1V
PRIMARY CONTROLLER WITH STANDBY
BLANKING
TIMING
SYNC
1
T
PWM
R
SOFT-START
FAULT
SGND
2R
12
15
DC-LIM
15V/10V
25V
VREF OK
8
CLK
DIS
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
Standby function for oscillator frequency reduction
when the converter is lightly loaded.
V
CC
+
-
MULTIPOWER BCD TECHNOLOGY
ORDERING NUMBERS: L5991/L5991A (DIP16)
S
R
COMP
6
Q
PWM UVLO
DIP16
E/A
+
-
Vref
2.5V
STAND-BY
VREF
13V
D97IN725A
L5991D/L5991AD (SO16)
4
VREF
10
11
16
9
5
SO16
L5991A
V
OUT
PGND
ST-BY
VFB
C
L5991
1/23

Related parts for L5991D

L5991D Summary of contents

Page 1

... Standby function for oscillator frequency reduction when the converter is lightly loaded. SYNC DC-LIM TIMING 25V + T 15V/10V - BLANKING PWM VREF OK CLK FAULT DIS SOFT-START SGND COMP L5991 L5991A DIP16 SO16 L5991D/L5991AD (SO16) VREF 4 Vref PWM UVLO 13V 10 OUT VREF 11 PGND 16 STAND-BY ST-BY + 2.5V 5 E/A - VFB D97IN725A 1/23 ...

Page 2

L5991 - L5991A ABSOLUTE MAXIMUM RATINGS Symbol V Supply Voltage ( Output Peak Pulse Current OUT Analog Inputs & Outputs (6,7) Analog Inputs & Outputs (1,2,3,4,5,15,14, 13, 16) P Power Dissipation @ T tot T Junction Temperature, ...

Page 3

ELECTRICAL CHARACTERISTICS (V unless otherwise specified.) Symbol Parameter REFERENCE SECTION V Output Voltage REF Line Regulation Load Regulation T Temperature Stability S Total Variation I Short Circuit Current OS Power Down/UVLO OSCILLATOR SECTION Initial Accuracy Duty Cycle Duty Cycle Accuracy ...

Page 4

L5991 - L5991A ELECTRICAL CHARACTERISTICS (continued.) Symbol Parameter OUTPUT SECTION Fall Time Rise Time UVLO Saturation SUPPLY SECTION V Startup voltage CCON V Minimum Operating CCOFF Voltage V UVLO Hysteresis hys I Start Up Current S I Operating Current op ...

Page 5

Figure 3. Quiescent current vs. input voltage ref 4.5Koh ° ...

Page 6

L5991 - L5991A Figure 9. Vref vs. junction temperature. Vref [V] 5.1 Vcc = 15V 5.05 Iref= 20mA 5 4.95 4.9 -50 - (°C) Figure 11. Output saturation. Vsat = V [ Vcc ...

Page 7

Figure 15. Switching frequency vs. tempera- ture. fsw (KHz) 320 Rt= 4.5Kohm 1nF 310 Vcc = 15V, V15=Vref 300 290 280 -50 - (°C) Figure 17. Dead time vs Ct. Dead time [ns] ...

Page 8

L5991 - L5991A STANDBY FUNCTION The standby function, optimized for flyback topol- ogy, automatically detects a light load condition for the converter and decreases the oscillator fre- quency on that occurrence. The normal oscillation frequency is automatically resumed when the ...

Page 9

Figure 23. Oscillator and synchronization internal schematic REF CLAMP R A RCT ST-BY 16 STANDBY The oscillation frequency can be established with the aid of the diagrams of fig. 14, where ...

Page 10

L5991 - L5991A during ESD tests), it can be connected to VREF through a 4.7k resistor. Figure 24. Duty cycle control REF ST- RCT 2 - ...

Page 11

Since the system tries restarting each hiccup cy- cle, there is not any latchoff risk. "Hiccup" keeps the system in control in case of short circuits but does not eliminate power com- ponents overstress during pulse-by-pulse limita- tion (from A ...

Page 12

L5991 - L5991A in fig.28) holds the pin low in order to ensure that the external MOS cannot be turned on acciden- tally. The peculiarity of this circuit is its ability to mantain the same sink capability (typically, 20mA @ ...

Page 13

Figure 30. Disable (Latched). DISABLE SIGNAL DIS 2.5V connecting DC-LIM to VREF (half duty cycle op- tion), Dx will be set approximately at 260 T Figure 31. Half duty cycle ...

Page 14

L5991 - L5991A now disconnected and C is charged through R T only. In this way the oscillator frequency (f be lower. Refer to pin 2 description to see how to calculate the timing components. Typical values for V and ...

Page 15

APPLICATION IDEAS Here follows a series of ideas/suggestions aimed at Figure 33. Typical application circuit for computer monitors (90W). either improving performance or solving common application problems of L5991 based supplies. L5991 - L5991A 15/23 ...

Page 16

L5991 - L5991A Figure 34. Typical application circuit for inkjet printers (40W). 16/23 ...

Page 17

Figure 35. Standby thresholds adjustment. Figure 36. Isolated MOSFET Drive & Current Transformer Sensing in 2-switch Topologies. L5991 12 PGND Figure 37. Low consumption start-up. 20V Figure 38. Bipolar transistor driver. L5991 SGND VREF ISEN ...

Page 18

L5991 - L5991A Figure 39. Typical E/A compensation networks. From Error Amp compensation circuit for stabilizing any current-mode topology except for boost and flyback converters operating with continuous inductor current. From V ...

Page 19

Figure 42. Protection against overvoltage/feedback disconnection (latched) R START DIS L5991 SGND PGND D97IN754 Figure 43 Protection against overvoltage/feed- back disconnection (not latched) R START V CC VREF 4 8 L5991 ...

Page 20

L5991 - L5991A Figure 47. Device shutdown on mains undervoltage 80÷400V Figure 48. Synchronization to flyback pulses (for monitors). 20/ VREF 4 4.7K 3 5.1 R2 10K SGND D97IN750B SYNC L5991 5.1V SGND ...

Page 21

DIM. MIN. TYP. MAX. MIN. a1 0.51 0.020 B 0.77 1.65 0.030 b 0 8.5 e 2.54 e3 17.78 F 7.1 I 5.1 L 3.3 Z 1.27 inch MECHANICAL DATA TYP. MAX. 0.065 0.020 ...

Page 22

L5991 - L5991A mm DIM. MIN. TYP. MAX. MIN. A 1.75 a1 0.1 0.25 0.004 a2 1.6 b 0.35 0.46 0.014 b1 0.19 0.25 0.007 C 0.5 c1 45˚ (typ.) D (1) 9.8 10 0.386 E 5.8 6.2 0.228 e ...

Page 23

... STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © ...

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