IC CTRLR PRIMARY BCD 16-DIP

L5991A

Manufacturer Part NumberL5991A
DescriptionIC CTRLR PRIMARY BCD 16-DIP
ManufacturerSTMicroelectronics
L5991A datasheet
 


Specifications of L5991A

Mfg Application Notes25W 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 AppNotePwm TypeCurrent Mode
Number Of Outputs1Frequency - Max1MHz
Duty Cycle93%Voltage - Supply8.2 V ~ 20 V
BuckNoBoostYes
FlybackYesInvertingNo
DoublerNoDividerNo
CukNoIsolatedYes
Operating Temperature0°C ~ 105°CPackage / Case16-DIP (0.300", 7.62mm)
Frequency-max1MHzDuty Cycle (max)93 %
Output Voltage5.075 VOutput Current1500 mA
Mounting StyleThrough HoleSwitching Frequency1000 KHz
Operating Supply Voltage12 V to 20 VMaximum Operating Temperature+ 150 C
Fall Time35 nsMinimum Operating Temperature- 40 C
Rise Time70 nsSynchronous PinYes
TopologyBoost, FlybackFor Use With497-8226 - BOARD EVAL L5991/STP12NK80Z497-6416 - BOARD EVAL L5991/STP10NK60Z497-5083 - EVAL BOARD 3PH PWR SUPPLY W/ESBT
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names497-5722
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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
DESCRIPTION
This primary controller I.C., developed in BCD60II
technology, has been designed to implement off
BLOCK DIAGRAM
2
RCT
+
3
DC
-
14
DIS
-
DIS
+
2.5V
OVER CURRENT
13
ISEN
+
-
1.2V
SS
7
1V
August 2001
PRIMARY CONTROLLER WITH STANDBY
MULTIPOWER BCD TECHNOLOGY
ORDERING NUMBERS: L5991/L5991A (DIP16)
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.
SYNC
DC-LIM
V
CC
1
15
8
TIMING
25V
+
T
15V/10V
-
BLANKING
S
Q
R
PWM
VREF OK
CLK
FAULT
DIS
SOFT-START
2R
R
12
6
SGND
COMP
L5991
L5991A
DIP16
SO16
L5991D/L5991AD (SO16)
VREF
4
Vref
PWM UVLO
9
V
C
13V
10
OUT
VREF
11
PGND
16
STAND-BY
ST-BY
+
2.5V
5
E/A
-
VFB
D97IN725A
1/23

L5991A Summary of contents

  • Page 1

    ... August 2001 PRIMARY CONTROLLER WITH STANDBY MULTIPOWER BCD TECHNOLOGY ORDERING NUMBERS: L5991/L5991A (DIP16) 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, ...

  • 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, Operating Range j T Storage Temperature, Operating Range stg (*) maximum package power dissipation limits must be observed ...

  • Page 3

    ... COMP sen COMP VSS = 0. 250mA 20mA 12V 200mA 12V 5mA 20V 20V V = 24V CC C L5991 - L5991A (*) C = 1nF; T Min. Typ. Max. Unit 4.925 5.0 5.075 0.4 mV/ C 4.80 5.0 5.130 V 30 150 mA 0.2 0 100 105 kHz 93 100 107 kHz 46 ...

  • Page 4

    ... I = 2mA ST-BY V Falling comp V Rising comp Master Operation I = 0.8mA SOURCE Vclock = 3.5V Slave Operation Low Level High Level VSYNC = 3. pin14 V = 15V CC Figure 2. L5991 - Quiescent current vs. input voltage (after disable 7.6V and Y= 8.4V for L5991A µ Min. Typ. Max 100 70 1 7.8 8 ...

  • Page 5

    ... Vcc =15V, after turn-on 500KHz RT=13 CT=1nF 1 300KHz 100KHz 0.1 0.01 -50 - Figure 8. Vref vs. junction temperature. Vref [V]) 5.1 5.05 5 4.95 4 -50 -25 L5991 - L5991A and switching frequency Operating current Vcc =15V, after turn-on RT=13.3k , CT=1nF DC=75%, Co=1nF Quiescent current Start-up current Vc=Vcc= Vccon-0.5V, before turn- ...

  • 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 = Vc = 15V 25° 0.2 0.4 0.6 Isource [A] Figure 13. UVLO Saturation Ipin10 [mA] 50 Vcc < Vccon 40 before turn- 200 400 600 800 Vpin10 [mV] 6/23 Figure 10 ...

  • Page 7

    ... V15 = 0V 2.5 2 V15 = Vref 1 Figure 20. E/A frequency response. G [dB] 150 100 50 PIN10 = OPEN 1V pulse 0 on PIN13 100 125 150 0.01 0.1 L5991 - L5991A Rt= 4.5Kohm 1nF Vcc = 15V, V15 100 125 Tj (°C) V15 = 0V V15 = Vref Rt = 4.5Kohm 1nF 100 Duty Cycle [%] 1 10 100 ...

  • 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 out- put load builds up and exceeds a defined thresh- old ...

  • Page 9

    ... limitation on the maximum duty cycle is re- quired (i.e. D ing. An internal pull-up (see fig. 24) holds the volt- age above 3V. Should the pin pick up noise (e.g. L5991 - L5991A SYNC 600 A CLK D97IN729A ...

  • 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 D97IN727A Pin 4. VREF (Reference Voltage). The device is provided with an accurate voltage reference (5V 1.5%) able to deliver some external circuit. A small film capacitor (0.1 F typ.), connected ...

  • Page 11

    ... Besides, no current flows when the gate voltage is 13V, steady state. Under UVLO conditions an internal circuit (shown SHORT T hic L5991 - L5991A + R g only. g ment. Rg' V ...

  • 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 @ 1V) from the start-up threshold. CC When the threshold is exceeded and the L5991 starts operating pulled high (refer to fig ...

  • Page 13

    ... STANDBY signal goes low the N-channel FET 11 is turned off and the pin becomes floating D97IN498 ISEN OUT DRIVER - R 10V 4 VREF STANDBY ST-BY LEVEL SHIFT RCT L5991 - L5991A (in order to get T , sets the operating frequency of the fact, as long osc is charged through R and V10 · V10 STANDBY ...

  • 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 respectively. This 1.5V hysteresis is enough to prevent undesired frequency change 5 ratio. osc ...

  • 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 38. Bipolar transistor driver. L5991 SGND VREF ISEN R A OPTIONAL D97IN751A ISOLATION BOUNDARY OUT ISEN 13 11 SGND V IN 2.2M 33K STD1NB50 REF 4 L5991 47K 12 11 D97IN762B OUT ISEN 13 L5991 11 PGND D97IN763 L5991 - L5991A R SENSE V IN D97IN761 T SELF-SUPPLY WINDING V IN 17/23 ...

  • 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 Error Amp compensation circuit for stabilizing current-mode boost and flyback topologies operating with continuous inductor current. ...

  • Page 19

    ... DC OUT L5991 11 PGND SGND Figure 46. Voltage mode operation Figure 44. Device shutdown on overcurrent L5991 11 PGND SGND D97IN755A ISEN SENSE DC 3 10K L5991 COMP SGND ISEN D97IN758A L5991 - L5991A R START DIS L5991 2.2K SGND PGND D98IN905 2 max VREF R SENSE DIS ISEN SENSE OPTIONAL D97IN756A R· ...

  • 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 L5991 12 11 PGND D97IN753A ...

  • 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 0.010 0.787 0.335 0.100 0.700 0.280 0.201 0.130 0.050 L5991 - L5991A OUTLINE AND DIP16 21/23 ...

  • 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 1.27 e3 8.89 F (1) 3.8 4 0.150 G 4.6 5.3 0.181 L 0.4 1.27 0.016 M 0.62 8˚(max.) S (1) D and F do not include mold flash or protrusions ...

  • Page 23

    ... The ST logo is a registered trademark of STMicroelectronics © 2001 STMicroelectronics – Printed in Italy – All Rights Reserved Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. STMicroelectronics GROUP OF COMPANIES http://www.st.com L5991 - L5991A 23/23 ...