HT7A6003 Datasheet, PDF (5/11 Pages) Holtek Semiconductor Inc – EMI-Improved Green Mode PWM Controller with Integrated Protections

HT7A6003
Application Information
Operation Overview
The HT7A6003 is a highly function-integrated off-line
PWM Controller which is optimized for applications
that needs strong EMI-Restraining and various
abnormal conditions protecting capability. This
device has a wide operating temperature range (-40°C
to 85°C), and provides many protection functions
such as Cycle-by-Cycle Current Limiting, SCP/
OLP, OVP, and Soft-Start function,, that ensure the
system implemented by HT7A6003 can operate very
stably at extreme environment like outdoor with ultra
low temperature (-40°C, the polar region), or high
EMI environment (factory or the region with highly
electromagnetic wave). The device is optimized for
the Energy-Star 2.0 specification, this ensures that any
EPS (External Power Supply) implemented using the
HT7A6003 can fully satisfy the Energy Star 1.1/2.0
Stand-by (No-Load) criteria.
Energy Consumption Criteria for No-Load
Nameplate Output
Power (P_no)
0 to < 50 watts
≥ 50 to ≤ 250 watts
Maximum Power in No-Load
AC-AC EPS AC-DC EPS
≤ 0.5 watts
≤ 0.3 watts
≤ 0.5 watts
≤ 0.3 watts
Table 1: Energy Star 2.0 No-Load Criteria
Ultra Low Stand-by Power for Energy Star
2.0 and Later Energy Star Requirement
The device contains many advanced control schemes
for Low Stand-by Power like tiny Operating/Stand-
by Current, Green Mode for Light-Load, etc. By
choosing an appropriate Stand-by resistor (as shown
in Fig. 7), EPS implemented by the device can fully
satisfy the Energy Star 2.0 No-Load criteria.
Base on device field test demo board results, for the
Full-Range (115V, 230V Vac) input, the Stand-by
Power will remain less than 0.3W@Pno=60W(as
shown in Table 2).This is within the Energy Star 2.0
criteria.
Demo Board
Input Condition
(P_no=60 watts)
Input Range
115V V_AC
230V V_AC
Stand-by Power
< 0.3W
< 0.3W
Table 2. Demo Board Stand-by Power Results
Advanced Precise-Oscillator for
Green-Mode Switching and Non-Acoustic
Noise Requirement
A Trimmed Precise Green Mode Oscillator is
implemented in the device to enhance the conversion
efficiency under conditions of light loads. As the
data shown in Fig. 8, the efficiency difference of the
traditional current mode PWM Controller between
light loads and heavy loads is more than 8%, while
the average efficiency is only 82%, the efficiency
difference of the HT7A6003 is only 1%, while
average efficiency is up to 87.5%.
Figure 7. Stand-by Resistor
Figure 8. Efficiency Comparison between
HT7A6003 & Traditional Current Mode PWM
Controller (Measured at HT7A3942 Demo Board)
Rev. 1.00
5
May 27, 2011