E-L5991AD STMicroelectronics, E-L5991AD Datasheet - Page 13
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E-L5991AD
Manufacturer Part Number
E-L5991AD
Description
IC CTRLR PRIMARY W/STDBY 16-SOIC
Manufacturer
STMicroelectronics
Datasheet
1.L5991AD13TR.pdf
(23 pages)
Specifications of E-L5991AD
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
8.2 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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5288-5
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Figure 30. Disable (Latched).
connecting DC-LIM to VREF (half duty cycle op-
tion), Dx will be set approximately at:
Figure 31. Half duty cycle option.
Figure 32. Standby function internal schematic and operation.
DISABLE
SIGNAL
C
FB
DIS
5
2.5
D
x
+
-
14
2.5V
2 R
COMP
6
V15=GND
V5=V13=GND
V15=VREF
V5=V13=GND
+
-
R
T
2.5/4
T
260
STANDBY BLOCK
t c
t c
+
-
2R
R
13
11
ISEN
UVLO
LEVEL SHIFT
D
R
+
-
10V
Q
DISABLE
STANDBY
D97IN502
t
d
t
d
R
DRIVER
and the output switching frequency will be halved
with respect to the oscillator one because an in-
ternal T flip-flop (see block diagram) is activated.
Fig. 31 shows the operation.
The half duty cycle option speeds up the dis-
charge of the timing capacitor C
duty cycles as close to 50% as possible) so the
oscillator frequency - with the same timing compo-
nents will be slightly higher.
Pin 16. S-BY (Standby Function). The resistor R
along with R
oscillator in normal operation (f
as the STANDBY signal is high, the pin is inter-
nally connected to the reference voltage VREF by
a N-channel FET (see fig. 32), so the timing ca-
pacitor C
the STANDBY signal goes low the N-channel FET
is turned off and the pin becomes floating. R
D97IN498
16
4
2
OUT
VREF
ST-BY
RCT
R
B
T
is charged through R
V10
V10
V2
V2
A
R
C
A
, sets the operating frequency of the
T
STANDBY
HIGH
LOW
D
D
X
X
D97IN752B
=
=
2 ·t c + t d
t c + t d
t c
t c
2.5V
V
T1
osc
L5991 - L5991A
V
4V
T2
T
A
). In fact, as long
(in order to get
and R
V
COMP
B
. When
13/23
B
B
is
,