Chipown
Low Standby-Power Off-line PWM converters
General Description
The PN6149 consists of an integrated Pulse Width Modulator (PWM) controller and power MOSFET, specifically designed for a high performance off-line converter with minimal external components. PN6149 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (adjustable OCP), and overload protection (OLP), over temperature protection(OTP), Over oltage Protection (OVP), CS Short-Circuit Protection and soft-start. Hi-mode, Eco-mode, Burst mode operation and device very low consumption helps to meet the standby energy saving regulations and achieve higher efficiency. Excellent EMI performance is achieved with frequency modulation. The device consists of the high voltage start-up circuit. The device provides an advanced platform well suited for the application of .The Six Levels of Energy Efficiency Standards, The Eur2.0, and The Energy Star.
Features
■ Internal 650V avalanche-rugged power MOSFET ■ Hi-mode（60kHz PWM） ■ Eco-mode（PFM）
■ Burst-mode （25kHz Burst-Mode） ■ Frequency modulation for low EMI
■ No-load consumption power <75 mW @230VAC ■ Built-in Soft Start
■ Internal HV Start-up Circuit
■ Internal Slope and line input Compensation ■ Open frame output power >24W @230VAC ■ Excellent Protection Coverage:
Over Temperature Protection（OTP） Over Load Protection（OLP）
Adjustable Over Current Protection（OCP） Over oltage Protection (OVP) CS Short-Circuit Protection
Applications
■ Switch AC/DC Adaptor and Battery Charger ■ Auxiliary Power for White Goods, PC,Audio ■ LCD /PDP TV Power
Package/Order Information
Order codes
Package
PN6149NSC-T1 DIP7 Typical Circuit
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A 1307 1 / 7
PN6149 Pin Definitions Table 1. Pin Definitions
Pin Number
Pin Name
Pin Function Description
1 CS Current Limit Set 2 GND Ground 3
VDD
Positive Supply voltage Input..
Voltage feedback. By connecting an opto-coupler to close the 4 COMP control loop and achieve the regulation. 5 6
NC No connection
HV MOSFET Drain pin. The Drain pin is connected to the primary
7 SW lead of the transformer. Note: NC Pin can not be connected
Typical Power Table 2. Typical power
Part number
Input voltage
Adapter
Open frame
24W PN6149 90-265 VAC 18W Note:
1. Typical continuous power measured at 45°C ambient temperature
Absolute Maximum Ratings Supply voltage Pin VDD…………………………………………………………………………………………….…... -0.3~32V High-Voltage Pin, SW…………………………………………………………………………………………………….…650V COMP Supply Voltage……………………………………………………………………………………………. …….-0.3~5.5V Junction Operating Temperature………………………………………………………………………………………… -40-140℃ Storage Temperature Range………………………………………………………………………………………………-55~150℃ Lead Temperature (Soldering, 10secs) ………………………………………………………………………………………260℃ Loss power (DIP-7，Temp.= 85) ……………………. ….…….…. ….…. ….…. …….…. ….…. …. ….…. ….…. …...1W ESD voltage Protection………………………………………………………….…. ….…. ….…. ….…. ….….…………. ..2.0kV The biggest drain pulse current……………………………………………………………………………………………… ….3A
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A.1307 2 / 7
PN6149 Electrical Characteristics
(TA =25°C, VDD = 14 V; unless otherwise specified)
SYMBOL Power Supply Section
VBVDSS Break-down voltage IOFF RDS(on)
Off-state drain current Drain-source on state resistance
PARAMETER
CONDITIONS
MIN
TYP MAX
UNIT
ISW =250uA, TJ = 25℃ VSW = 550 V, VCOMP = GND ISW = 1A, VCOMP = 3V, TJ = 25℃
VSW = 120 V, VCOMP = GND, VDD = 4 V
VSW = 120 V , VCOMP = GND, VDD = 4 V after fault. After turn-on
650 690 2.0
V 100 uA Ω
Supply Voltage Section
VSW_START
start up voltage 90 V
-1.5 mA 9 24 28 12 7 5
-0.6
mA
IDD_CH Start up charging current
VDD VDDovp VDDclamp VDDon VDDoff
VDD(RESTART)
Operating voltage range VDD OVP Voltage VDD clamp voltage VDD start up threshold VDD under voltage shutdown threshold
VSW = 120 V , VCOMP = GND VSW = 120 V , VCOMP = GND VSW = 120 V , VCOMP = GND VSW = 120 V, VCOMP = GND, VCOMP = GND, FSW = 0 kHz, VDD = 10 V
24 V 29 32 14 9 6.5
V V V V V
Supply Current Section
IDD0 IDD1 IDD_FAULT IDD_OFF COMP Section
VCOMP open VCOMP_OLP VCOMP_ECO VCOMP_bm ICOMP
VCOMP open Loop Voltage
Over load shut down threshold ECO mode threshold Burst mode threshold Operating supply current, not switching
1.0 mA
3.5
mA
Operating supply current, switching VSW = 120 V, FSW = 60kHz Operating supply current, with protection tripping
Operating supply current with VDD VDD = 7 V < VDD off
500 uA 450 uA
4 4.5
Voltage falling when frequency decrease Voltage falling
3.7
V
2 V VCOMP_bm_hys Burst mode hysteresis threshold Voltage rising
Feedback sourced current
VCOMP = GND
Td_olp Avcs
1.2 1.3 -200 64 3.3
V V uA mS V/V
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A.1307 3 / 7
SYMBOL Current Sense Section
TSS TON_MIN Td TLEB Vth_OC
Soft-start time Minimum turn ON time Propagation delay time Leading edge blanking time Current limiting threshold voltage
8.5 500 150 350 0.45 0.55
PARAMETER
CONDITIONS
PN6149 MIN TYP MAX
UNIT
ms ns ns ns V V
Vocp_clamping Current limiting clamping voltage OSCILLATOR SECTION
FOSC FD FM DMAX FBurst TSD THYST
Switching Frequency Frequency Variation Modulation frequency Maximum duty cycle Burst Mode Base Frequency
VDD = operating voltage range, VCOMP = 3V
54 60 66 kHz
70 21.5
250
±5
kHz Hz
85 %
25 160 30
kHz THERMAL SECTION
Thermal shutdown temperature Thermal shutdown hysteresis
140
°C °C
Typical Application
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A.1307 4 / 7
PN6149 Operation Description 1. Startup
At start up, the internal high-voltage current source supplies the internal bias and charges the external VDD capacitor. When VDD reaches 13V, the device starts switching and the internal high-voltage current source stops charging the capacitor. The device is in normal operation provided VDD does not drop below 8V. After start up, the bias is supplied from the auxiliary transformer winding.
When high voltage current source is turned on, the charge current of the VDD capacitance is 1.5mA. If a fault happen, the circuit enter auto- recovery mode and IDD charge current is turned to 0.6mA.
2. Soft-start up
In the process of start up, the current of drain increases to maximum limitation step by step. As a result, it can reduce the stress of secondary diode greatly and prevent the transformer turning into the saturation states. Typically, the duration of soft-start is 8.5ms.
3. Gate driver
The internal power MOSFET in PN6149 is driven by a dedicated gate driver for power switch control. Too weak the gate driver strength results in higher conduction and switch loss of MOSFET while too strong gate drive results in worse EMI.
A good tradeoff is achieved through the built-in totem pole gate design with proper output strength and dead time. The good EMI system design and low idle loss is easier to achieve with this dedicated control scheme.
4. Oscillator
The switching frequency of PN6149 is internally fixed at 60 kHz. No external frequency setting components are required for PCB design.
The frequency modulation is implemented in PN6149. So that, it minimizes the conduction band EMI and therefore eases the system design because the tone energy could be spread out.
5. Feed-back
The PN6149 is a current mode controlled device. The feedback voltage is compared with an internally generated saw-tooth waveform. This controls the duty cycle directly.
6. Over load protection (OLP)
Over load is defined as the load current exceeding a pre-set level due to an accident event as a fault. If VCOMP exceeds 3.7V for more than 64ms (power limit debounce time), in this case, the protection circuit should be activated to protect the SMPS.
7. Burst-mode operation
PN6149 enters burst-mode operation in order to minimize the power dissipation in standby mode. As the load decreases, the feedback voltage decreases. When the voltage on COMP pin falls below 1.2V （typ,） VCOMPbm, the device enters burst mode and power MOSFET stops switching. It can be switched on again once the voltage on COMP pin exceeds 100mV over VCOMPbm. The switching frequency control also eliminates the audio noise at any loading condition.
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A.1307 5 / 7
PN6149 8 Adjustable current limit of over current protection (OCP)
Cycle-by-Cycle current limiting is offered in PN6149 current mode converter. The switch current is detected by a sense resistor into the CS pin. The current limiting comparator is disabled and cannot turn off the power MOSFET during the blanking time. PN6149 could regulate the current limit through changing the Rcs value.
9. ECO mode
Hi-mode, Eco-mode, Burst mode operation helps to meet the standby energy saving regulations and achieve higher efficiency. When VCOMP less than VCOMP_Eco（typ. 2V）, PN6149 enter ECO mode.
10. Line Input Compensation
PN6149 offer Line Input Compensation, this improves the power limit constant output.
11. Internal Slope Compensation
Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus reduces the output ripple voltage.
12. Over temperature protection (OTP)
The power MOSFET and control chip are integrated, making it easier for control chip to detect the temperature of MOSFET. If the temperature exceeds about 160℃，OTP fault is activated.
13 . CS Short-Circuit Protection
PN6149 provide the CS Short-Circuit Protection, If the CS resistance short circuit before the System Starting, Chip enter the CS Short-Circuit Protection stat. To protect the system in the exceptional situation
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A.1307 6 / 7
PN6149 Package Dimensions（DIP7）
Table 3 DIP7 mechanical data
Size symbol Size Min(mm) Nom(mm) Max(mm) symbol Min(mm) Nom(mm) Max(mm) A 3.60 3.80 4.00 D 9.05 9.25 9.45 A1 0.51 E1 6.15 6.35 6.55 2.54BSC 7.62BSC A2 3.00 3.30 3.40 e A3 1.55 1.60 1.65 eA b 0.44 - 0.53 eB 7.62 - 9.30 b1 0.43 0.46 0.48 eC 0 - 0.84 B1 1.52BSC L 3.00 c 0.25 - 0.31 H c1 0.24 0.25 0.26 0.90REF Figure 2 Package dimensions
A3A2AA1BB1BLbeceAeBeC76D5bb1E1BASE METALWITH PLATINGc1cSECTION B-B1234
TOP MARK PN6149 YWWXXXXX
Note: Y: Year Code; W: Week Code; XXXXX: Internal Code
Package DIP7
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn Rev.A.1307 7 / 7
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