TB6549F Toshiba, TB6549F Datasheet - Page 7

• Manufacturer Part Number: TB6549F
• Manufacturer: Toshiba

Specifications of TB6549F

• Operating Current: 10mA
• Operating Temperature Classification: Commercial
• Package Type: HSOP
• Operating Supply Voltage (min): 10V
• Operating Supply Voltage (max): 27V
• Lead Free Status / RoHS Status: Not Compliant

Note: Be sure to set the pin PWM to High when the PWM control function is not used.
2. Standby Circuit
OUT1
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Output Voltage Waveform
All circuits are turned off except the standby circuit and the charge pump circuit under the standby
condition.
The input voltage range is shown below. Input at CMOS and TTL level is possible. The input signal has
0.2 V (typ.) hysteresis.
Do not attempt to the control the output by inputting PWM signals to the standby pin. Doing so may
cause the output signal to become unstable, resulting in destruction of the IC.
The charge pump circuit is turned ON/OFF by the switch of the input signal from the standby pin. If
the switching cycle is shorter than 50 ms, the charge pump circuit will not operate with precise timing.
Therefore the switching cycle of the standby pin should be longer than 50 ms.
When the Standby condition is changed to Operation Mode, set IN1 and IN2 to Low level (Stop Mode) at
first. Then switch IN1 and IN2 to High level when the charge pump circuit reaches the stable condition,
i.e., when VcpA is about V
PWM ON
V
V
(OUT1)
INSH
INSL
M
t1
: GND to 0.8 V
: 2 to V
OUT1
reg
PWM OFF → ON
t4 = 300 ns (typ.)
SB
V
GND
CC
V
M
CC
V
DD
+ 5 V.
t1
t2
OUT1
V
PWM ON → OFF
t3
GND
t2 = 300 ns (typ.)
CC
100 kΩ
M
7
t4
t5
OUT1
V
DD
V
GND
CC
PWM ON
t5
M
OUT1
TB6549F/FG/P/PG/HQ
V
GND
CC
V
GND
CC
PWM OFF
M
t3
2007-3-6
V
GND
CC