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PDF HT7A4016 Data sheet ( Hoja de datos )
| Número de pieza | HT7A4016 | |
| Descripción | Wide Temperature Range General Purpose Current Mode PWM Controller | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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HT7A4016
Low Power, Wide Temperature Range General
Purpose Current Mode PWM Controller
Feature
• High Performance, Low Cost Current Mode PWM
Controller especially designed for Energy Star 2.0
• Very Low Startup Current (<20μA) and Operating
Current
• High-Voltage CMOS Process with Excellent ESD
protection (>3KV)
• ±5% Trimmed Oscillator for Precise Frequency
Control
• LEB (Leading-Edge Blanking) on CS Pin
• Internal Slope Compensation
• Programmable Switching Frequency
• Internally Trimmed Reference with UVLO (Under
Voltage Lockout)
• Cycle-by-Cycle Current Limiting
Applications
• Switching AC-DC Adaptors
• DC-DC Switching Buck/Boost Converters
• LED Backlights for LCD/LED TVs
General Description
The HT7A4016 is a controller IC that includes the
necessary features to implement off-line or DC-DC
current mode control schemes with a minimal external
parts count. Internal circuits include a specially
designed Mixed-Mode/Analog Interface for multi-
function and multi-topology control schemes (DC-DC
Buck/Boost, Off-line AC-DC), a trimmed oscillator
for precise duty-cycle control under voltage lockout
with a start-up current of less than 0.5mA, a wide
temperature range, precise voltage reference, internal
Slope Compensation and Leading-Edge Blanking.
The HT7A4016 features basic system protection
functions such as Cycle-by-Cycle Current Limiting
and Under Voltage Lock-Out (UVLO).
A Multi-Function Pin can be used as a dimming
function for LED driving, and as a primary feedback
control for Primary-Side Feedback AC-DC
applications.
Application Circuits
VIN=24V
0.1uF
VCC
Vref
2.2K
GD
RT
COMP/FB
GND
CS MF
470uF/50V
10 1N4148
20
10K
33pF
470K
1nF
46uH
HFB20HJ20C
IRF540
0.22
820
0.22
220pF 40K
470uF
/63V
Vo=55V/75W
0.1uF/100V
2K
Rev. 1.00
1 November 07, 2011
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
HT7A4016
Application Information
Operation Overview
The HT7A4016 is a low power, wide temperature
range general purpose current mode PWM Controller.
The device is designed to require a minimum of
external components for different power circuit
topologies such as Primary-Side Feedback Flyback
and DC-DC Buck/Boost. The device can be used for
LED driving applications such as LED backlights
and LED lighting. To meet LED constant current
requirements, the device can maintain a low current
tolerance of ±1% for LED driving applications.
Under Voltage Lockout (UVLO)
A UVLO comparator is provided to ensure that the
device is fully functional before the output stage is
enabled. As shown in Figure 5, hysteresis is provided
to prevent the PWM Controller from shutting down
during any voltage dips which might occur during the
startup process. The turn-on and turn-off threshold
levels are set at 16.0V and 10.0V, respectively.
Figure 6 LEB with R-C Filter Removed
Internal Slope-Compensation
An important issue with current mode control
schemes is instability due to sub-harmonic oscillation
when the Duty-Cycle > 50%. To prevent this problem
from occurring, a Slope-Compensation function
is always necessary. In traditional current mode
controller applications, many external components
are necessary to implement a Slope-Compensation
function. However in the HT7A4016 the internal
Slope-Compensation function eliminates the need for
these external components resulting in a simplified
application circuit design.
Os Oscillator Frequency Tuning
By choosing an appropriate value of external resistor
between the RT Pin and GND, a suitable operating
frequency can be generated. The relationship between
the RT value and the operating frequency is provided
in Figure 7.
Figure 5 UVLO Scheme and Start-Up Current
Current Sense and Leading-Edge
Blanking (LEB)
For Isolation Flyback applications, a Leading-
Edge Blanking Scheme is necessary. A Leading-
Edge Blanking Scheme is integrated in the device to
prevent false triggering due to feedback current spikes
which may appear on the CS pin. This eliminates
the need for the usual R-C filter which is normally a
requirement in typical current mode PWM Controller
applications.
Figure 7 RT Resistor Value vs. Operating Frequency
Rev. 1.00
5 November 07, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
HT7A4016
Carrier Tape Dimensions
D
E
F
P0
D1 P
P1 t
W C B0
K0
A0
SOP 8N (150mil)
Symbol
Description
W Carrier Tape Width
P Cavity Pitch
E Perforation Position
F Cavity to Perforation (Width Direction)
D Perforation Diameter
D1 Cavity Hole Diameter
P0 Perforation Pitch
P1 Cavity to Perforation (Length Direction)
A0 Cavity Length
B0 Cavity Width
K0 Cavity Depth
t Carrier Tape Thickness
C Cover Tape Width
R e e l H o le
IC p a c k a g e p in 1 a n d th e r e e l h o le s
a r e lo c a te d o n th e s a m e s id e .
Dimensions in mm
12.0+0.3/-0.1
8.0±0.1
1.75±0.10
5.5±0.1
1.55±0.1
1.50 +0.25/-0.00
4.0±0.1
2.0±0.1
6.4±0.1
5.2±0.1
2.1±0.1
0.30±0.05
9.3±0.1
Rev. 1.00
11
November 07, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HT7A4016.PDF ] | |
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