AN8049SH-E1 Panasonic - SSG, AN8049SH-E1 Datasheet - Page 20

• Manufacturer Part Number: AN8049SH-E1
• Description: IC MULTI CONFIG 40MA SSOP24D
• Manufacturer: Panasonic - SSG
• Type: Step-Down (Buck), Step-Up (Boost), Invertingr

Specifications of AN8049SH-E1

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 3
• Current - Output: 40mA
• Frequency - Switching: 20kHz ~ 1MHz
• Voltage - Input: 1.8 ~ 14 V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP
• Power - Output: 146mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Other names: AN8049SHE1; AN8049SHE1TR

AN8049SH
I Application Notes (continued)
20
[8] Parallel synchronous operation of multiple ICs
to each other as shown in figure 7, the ICs will operate at the same frequency.
control IC (e.g. the AN8017SA or AN8018SA) in this parallel synchronous mode. In this case, short the OSC and Off
pins together.
Notes on parallel operation:
1. The remote on/off state of each individual IC cannot be controlled independently.
2. All ICs are shut down when an output shorted state occurs.
Multiple instances of this IC can be operated in parallel. If the OSC pins (pin 17) and OFF pins (pin 8) are connected
It is also possible to operate a one-channel control IC (e.g. the AN8016SH or AN8016NSH) and a two-channel
at the same time.
temporarily and the OSC pin held fixed at about 1.2 V. As a result the IC2 OUT1 to OUT3 pins will be forced
temporarily to the full off-state and the DC-DC converter output voltage will fall.
circuit will latch. When this happens, the IC1 output stops, and at the same time the sawtooth oscillator stops, and
the OSC pin is held fixed at about 1.2 V.
voltage will drop. Finally, the IC2 output short-circuit protection circuit will operate, and the latch will go to the
latched state. This behavior will also occur if the IC2 output falls first.
In this sort of circuit, always connect all the Off pins together, and control the on/off states of the multiple ICs
The reason for this is that if, for example, IC1 is solely turned on/off, the sawtooth wave will be stopped
For example, if the IC1 output voltage falls, its output short-circuit protection circuit will operate, and the latch
As a result, the IC2 OUT1 to OUT3 pins temporarily go to the full off-state, and the DC-DC converter output
IC1
H
L
AN8049SH
Figure 7. Slave operation circuit example
SDH00012BEB
OSC pins
connected
together
IC2
AN8049SH
Off pins
connected
together