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ꢆꢅ ꢇꢆ ꢈꢉꢊꢋ ꢋꢌꢍ ꢊꢎꢋꢏ ꢅꢉ ꢅꢐ ꢑ ꢉꢅ ꢒ ꢏ ꢆꢓ ꢑꢑ ꢋ ꢁ
ꢉꢔ ꢅ ꢀꢏ ꢆꢅꢑ ꢇ ꢎꢋꢇ ꢕꢁ ꢓꢀꢐ ꢎ ꢏꢐ ꢑꢀꢎ ꢐ ꢁꢁ ꢋꢎ
SLVS262 − FEBRUARY 2000
D
D
High-Speed Output Circuit to Drive PNP
Power Transistor
D
D
D
D
D
D
Output Voltage Limit (Channel 5 and 6)
Low Supply Current
Precision Reference Voltage . . . 1.5 V 2%
Internal Undervoltage Lockout Protection
Internal Short-Circuit Protection
Shutdown Function
at T = 25°C
A
D
Oscillator Frequency . . . 50 kHz to 0.8 MHz
D
Low Supply Voltage Operation V
to 12 V
= 2.5 V
CC
External Sink Current Setting on Output
Stage
description
The TL1466I is a six channel pulse-width-modulation (PWM) control circuit. This device contains reference
voltage with a precision of 2%, a triangle wave oscillator capable of high frequency oscillation up to 0.8 MHz,
various protection circuitry, and shutdown circuitry. The output regulation voltage for each channel is set by an
external resistor divider. Moreover, the output stage is capable of driving a PNP power transistor with high
speed. The high frequency/efficiency switching operation eliminates switching loss by using internal over-drive
circuitry at the rising edge and with reverse bias connecting external bootstrap capacitor at the falling edge. The
MOSFET can be used in parallel with the output diode at channel 1 and 4. This results in further high efficiency
operation replacing the constant time with this MOSFET when the output diode is turned on. Furthermore, it
operates 2.5 V supply voltage and balances switching current by switching repeatedly at the reverse phase with
two pairs (channel 1, 4, 6, and 2, 3, 5) of the six channels. The oscillator output of channel 1, 4, and 6 is reverse
phase for channel 2, 3, and 5. As a result of these features, this device is well-suited for power supply of portable
systems in battery-powered equipment.
FUNCTION TABLE FOR STANDBY
INPUT
STANDBY STANDBY-3
V ≤ 0.4 V
OUTPUT
VREF
OFF
ON
OUTPUT1, 2, 4, 5, 6 OUTPUT3
†
X
OFF
ON
OFF
ON
I
V ≥ 2 V
I
V ≥ 2 V
I
V ≤ 0.4 V
ON
ON
OFF
I
†
X: High-level or low-level
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright 2000, Texas Instruments Incorporated
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