AP494 查看數據表（PDF） - Anachip Corporation
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AP494 Datasheet PDF : 9 Pages
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Voltage Mode PWM Controller
AP494
Features
- Complete PWM Power Control Circuitry
- Uncommitted Outputs for 200-mA Sink or Source
Current
- Output Control Selects Single-Ended or
Push-Pull Operation
- Internal Circuitry Prohibits Double Pulse at Either
Output
- Variable Dead Time Provides Control Over Total
Range
- Internal Regulator Provides a Stable 5-V
Reference Supply with 3% Tolerance
- Circuit Architecture allows Easy Synchronization
Connection Diagram
(TOP VIEW)
1 IN+ 1
1 IN- 2
FEEDBACK 3
DTC 4
CT 5
RT 6
GND 7
C1 8
16 2 IN+
15 2 IN-
14 REF
13 OUTPUT CTRL
12 Vcc
11 C2
10 E2
9 E1
Ordering Information
Description
The AP494 incorporates on a single monolithic chip
all the functions required in the construction of a
pulse-width-modulation control circuit. Designed
primarily for power supply control, this device offers
the systems engineer the flexibility to tailor the
power supply control circuitry to a specific
application.
The AP494 contains two error amplifiers, one
adjustable on-chip oscillator, a dead-time control
(DTC) comparator, a pulse-steering control flip-flop,
a 5-V, 3%-precision regulator, and output-control
circuits.
The error amplifiers exhibit a common-mode
voltage range from –0.3V to VCC –2V. The
dead-time control comparator has a fixed offset that
provides approximately 5% dead time. The
on-chipped oscillator may be bypassed in two ways.
One is to terminate RT to the reference output
and the other one is to provide a sawtooth input to
CT, or it may drive the common circuits in
synchronous multiple-rail power supplies.
The uncommitted output transistors provide either
common-emitter or emitter-follower output
capability. The AP494 provides for push-pull or
single-ended output operation, which may be
selected through the output-control function. The
architecture of this device prohibits the possibility of
either output being pulsed twice during push-pull
operation.
The AP494 is characterized for operation from 0oC
to 70oC.
AP494 X X X X
Temp. grade
Blank: 0 ~70oC
I : -40 ~85oC
Package
Lead Free
Packing
S16 : SOP-16L Blank : Normal
Blank : Tube
N16 : DIP-16L L : Lead Free Package A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 Oct 11, 2004
1/9
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