IEC 62637-1-2011 pdf free download – Battery charging interface for small handheld multimedia devices – Part 1: 2 mm barrel interface
This part of IEC 62637 defines a charging interface between small handheld multimedia devices and power-supply accessories, specifically chargers. Devices, which could be based on this standard may vary over time, but have to comply with the limited power available 1 . The interface is a 2 mm barrel type charging interface. This standard does not include the whole charger nor does it include the internal functions of the device. Chargers and devices shall follow the applicable EMC and safety standards. The scope of this part of IEC 62637 is illustrated in Figure 1 .
2 Normative references The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62637-2, Battery charging interface for small handheld multimedia devices – Part 2: 2 mm barrel type interface conformance testing
4 Specifications for 2 mm barrel interface
4.1 General Clauses 4 to 8 specify the 2 mm barrel type electrical and mechanical charging interface between devices and power-supply accessories, specifically chargers. Clause 7 defines the charger-identification process of these devices. The 2 mm barrel interface may have a wide output current range and the current may change with other parameters, but shall stay within the charging current/voltage window specified in 5.6. The recommended minimum current is specified in 5.6.
4.2 Temperature
All specifications apply at normal room temperature 1 8 °C to 25 °C, unless some other temperature is specified.
4.3 Voltage
All specifications are valid under nominal operating voltage as defined by the manufacturer.
5 Electrical specification for 2 mm barrel type chargers
5.1 Charger output capacitance
The capacitance at the charger output causes charging current spikes when the charger’s load is changing. Low-capacitance values are recommended if possible. The maximum charger output filter capacitor size shall be 1 000 µF with + 20 % tolerance if the charger V max-out is less than 7 V. For output voltages of 7,0 V to 9,3 V, the maximum capacitance value decreases linearly so that for a 9,3 V charger, the maximum output capacitance shall be 700 µF with + 20 % tolerance. The maximum capacitance value is illustrated in Figure 2.
5.2 Maximum transient voltage and current values
Table 1 gives the maximum limits for voltage values and settling times. These limits apply to all conditions.
Limits are also valid for a damaged (single fault) charger and these voltage and current limits shall be doubly ensured, meaning that if the general charging voltage control system fails, there shall be a backup limiter inside the charger. The maximum charging current overshoot and maximum voltage undershoot are shown in Figure 3.
5.3 Maximum output ripple voltage
The maximum allowed output ripple voltage with maximum output current of the charger is 300 mV RMS for output voltages V out between 2,5 V and 5,5 V. The maximum acceptable output peak-to-peak ripple voltage is separated to four frequency ranges.
A sum of ripple voltages over the full frequency range 0 MHz to 1 MHz is 800 mV p-p . Ripple voltage shall be measured using 0 kΩ to 6 kΩ resistive load. During the test all the measured V and I values shall be within the voltage / current window of the charger interface. Note that charging voltage, including ripple, shall not have peak values outside the V/I window (see 5.6) for charger output.IEC 62637-1 pdf download.